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Overview

LeetCode Patterns - Top Patterns for Coding Interviews
How to Study
Math Basics
Runtime to Algo Cheat Sheet
Keyword to Algo Cheat Sheet

Basic Data Structures

Stack Intro
Queue Intro
Hashmap Intro
Python Basic Data Structures
Java Basic Data Structures
JavaScript Basic Data Structures
C++ Basic Data Structures

Basic Algorithms

Intro to Sorting
Advanced Sorting Algorithms - Merge Sort | Quick Sort
Sorting Summary
Built-in Sort with Custom Comparator

Overview

Vanilla Binary Search
First True in a Sorted Boolean Array

Sorted Array

Monotonic Function
First Element Not Smaller Than Target
First Occurrence
Square Root Estimation

Implicitly Sorted Array

Minimum in Rotated Sorted Array
Peak of Mountain Array

Advanced

Newspapers

Speedrun

Binary Search Speedrun

Introduction

Recursion Review
Everything About Trees
DFS Fundamentals

DFS on Tree

Introduction
Max Depth of A Tree
Visible Tree Node
Balanced Binary Tree
Serializing and Deserializing Binary Tree
Invert Binary Tree

Binary Search Tree

Binary Search Tree Intro
Valid Binary Search Tree
Insert Into BST
Lowest Common Ancestor of a Binary Search Tree

Advanced

Lowest Common Ancestor

Combinatorial Search

DFS with States
Backtracking 1
Generate All Phone Number Combinations

Pruning

Backtracking 1 - Pruning
Partition a String Into Palindromes

Additional States

Backtracking 1 - Additional States
Generate All Valid Parentheses
General All Permutations

Aggregation and Memoization

Backtracking 2 - Aggregation
Memoization
Word Break
Num Ways to Decode a Message
Min Coins to Make Change

Dedup

Deduplication
Combination Sum

Additional Practices

Subsets

Speedrun

Backtracking Speedrun

Introduction

BFS Fundamentals

BFS on Tree

Binary Tree Level Order Traversal
Binary Tree ZigZag Level Order Traversal
Binary Tree Right Side View
Binary Tree Min Depth

Introduction

Graph Fundamentals
BFS on Graphs
DFS on Graph
BFS or DFS

Vanilla BFS

Shortest Path

Matrix as Graph

Matrix as Graph
Flood Fill
Number of Islands
Knight Minimum Moves
Walls and Gates / Zombie in Matrix

Implicit Graph

Open the Lock
Word Ladder
Sliding Puzzle

Directed Graph / Topological Sort

Topological Sort Introduction
Task Scheduling
Reconstructing Sequence
Task Scheduling 2
Alien Dictionary
Course Schedule

Weighted Graph

Dijkstra's Algorithm | Shortest Path in a Weighted Graph

Minimum Spanning Tree

Introduction to Minimum Spanning Tree
Minimum Spanning Tree | Forests

Speedrun

Graph Speedrun - Part 1
Graph Speedrun - Part 2

Introduction

Two Pointers Introduction

Same Direction

Remove Duplicates
Middle of a Linked List
Move Zeros

Opposite Direction

Two Sum Sorted
Valid Palindrome

Sliding Window

Subarray Sum - Fixed
Find All Anagrams in a String
Sliding Window - Longest
Longest Substring without Repeating Characters
Sliding Window - Shortest
Least Consecutive Cards to Match

Prefix Sum

Prefix Sum

Cycle Finding

Linked List Cycle

Advanced

Minimum Window Substring
Teleporter Arrays

Speedrun

Two Pointers Speedrun

Introduction

Heap Fundamentals

Top K

K Closest points
Merge K Sorted Lists
Kth Largest Element in an Array
Kth Smallest Element in a Sorted Matrix

Moving Best

Reorganize String
Ugly Number

Multiple Heaps

Median of Data Stream

Introduction

Dynamic Programming Introduction and Patterns

Grid

Grid DP Introduction
Number of Robot Paths
Minimal Path Sum
Triangle
Maximal Square

Dynamic number of subproblems

Longest Increasing Subsequence
Largest Divisible Subset
Perfect Squares
Divisor Game

Interval

Interval DP Introduction
Coin Game
Festival Game

Dual-Sequence

Dual-Sequence DP Introduction
Longest Common Subsequence
Edit Distance
Delete String

Knapsack

Knapsack DP Introduction
Knapsack, Weight-Only
Partition to Two Equal Sum Subsets
0-1 Knapsack
Coin Change
Coin Change II

Bitmask

Bitmask Introduction
Min Cost to Visit Every Node

Additional Practices

DP Practice List

Disjoint Set Union | Union Find

DSU/Union Find Fundamentals
DSU Introductory Problem
Size of Connect Components
Merge User Accounts
Number of Connected Components
Umbristan | Reverse Union Find

Trie

Trie Introduction
Autocomplete
Prefix Count

Data Structure Design

LRU Cache

Segment Tree

Segment Tree
Range max

Interval

Intervals
Merge Intervals
Insert Interval
Meeting Room

Monotonic Stack

Monotonic Stack/Queue Intro
Sliding Window Maximum
Daily Temperatures
Next Greater Element II

Divide and Conquer

Divide and Conquer Intro
The Skyline Problem
Count of Smaller Numbers After Self

Line Sweep

Line-Sweep Introduction

Tree Traversal without Recursion

Closest BST Values II

Greedy

Greedy Introduction
Gas Station

Math

Prime Sieve Introduction
N-th prime

Matrix

Sparse Matrix Multiplication

Classics

Playing Cards
Parking Spots
Public Library
Call Center
Vending Machine

Concepts

Load Balancing
Partition and Sharding
Caching

Projects

URL Shortener | TinyURL | System Design Interview Question
Web Crawler

Amazon OA

Amazon Online Assessment Questions 2021 (OA)
Robot in Circle
Number Game
Find All Combination of Numbers that Sum to a Target
Fill The Truck
Slowest Key
Five Star Sellers
Number of Ways to Split Into Primes
Storage Optimization
Music Pair
Minimum Difficulty of a Job Schedule
Autoscale Policy, Utilization Check
Optimal Utilization
Merge Two Sorted Lists
Two Sum - Unique Pairs
Shopping Patterns
Amazon Prime Air Delivery Route
Reorder Data in Log Files
Top K Frequently Mentioned Keywords

Microsoft OA

Microsoft Online Assessment Questions
Max Network Rank
Minimum Adj Swaps to Make Palindrome
Lexicographically Smallest String
Longest Substring Without 3 Contiguous Occurrences of Letter
Min Moves to Obtain String Without 3 Identical Consecutive Letters
String Without 3 Identical Consecutive Letters
Longest Semi-Alternating Substring
Min Steps to Make Piles Equal Height
Day of week that is K days later
Max Inserts to Obtain String Without 3 Consecutive 'a'
Concatenated String Length with unique Characters
Largest K such that both K and -K exist in array
Min Adj Swaps to Group Red Balls
Maximum Length of a Concatenated String with Unique Characters
Unique Integers That Sum Up To 0
Min Deletions To Obtain String in Right Format
Particle Velocity
Widest Path Without Trees
Jump Game
Fair Indexes
Partition array into N subsets with balanced sum

Google OA

Google Online Assessment Questions 2021 (OA)
Compare Strings
Largest Subarray
Maximum Area Serving Cake
Minimum Number of Decreasing Subsequence Partitions
Pick Up Coupons
Rose Garden
Smallest Integer Satisfying the Rule
Fill 2D Array
Water Plants
Split Strings
Google Online Assessment 2021 (OA) - Rings on Rods
Google Online Assessment 2021 (OA) - Longest Palindrome

Twitter OA

Twitter Online Assessment Questions 2021 (OA)
K-Different Pairs
Weird Faculty
Social Network
University Career Fair
Game Events
Activate Fountain
Final Discounted Price
Partition Array
Authentication Tokens
Parking Dilemma
Efficient Job Processing Service
Unique Twitter User ID Set

Editorials

Minimum Swaps to Group All 1's Together
Akuna OA
Bad Product
Beautiful Arrangement
Boats to Save People
Combination Sum II
Container With Most Water
Course Schedule II
Koko Eating Bananas
Evaluate Division
Find All Possible Recipes From Given Supplies
Grey Code
Is Graph Bipartite
Kth Missing Positive Number
Longest Substring with At Most Two Distinct Characters
Matchsticks to Square
Maximal Network Rank
Minimum Swaps to Group All 1's Together
Minesweeper
Minimum Size Subarray Sum
Minimum Swaps to Group All 1's Together
My Calendar I
Network Delay Time
Numbers With Same Consecutive Differences
Pacific Atlantic Water Flow
Path Sum II
Permutations II
Plates Between Candles
Reconstruct Itinerary
Redundant Connection
Regions Cut By Slashes
Restore IP Addresses
Minimum Swaps to Group All 1's Together
Rotting Oranges
Satisfiability of Equality Equations
Find First and Last Position of Element in Sorted Array
Shortest Path in Binary Matrix
Single Element in a Sorted Array
Snapshot Array
Minimum Swaps to Group All 1's Together
Subsets II
Time Based key-Value Store
Minimum Swaps to Group All 1's Together
Word Break II
1. Two Sum
2. Add Two Numbers
3. Longest Substring Without Repeating Characters
4. Median of Two Sorted Arrays
5. Longest Palindromic Substring
6. Zigzag Conversion
7. Reverse Integer
8. String to Integer (atoi)
9. Palindrome Number
10. Regular Expression Matching
11. Container With Most Water
12. Integer to Roman
13. Roman to Integer
14. Longest Common Prefix
15. 3Sum
16. 3Sum Closest
17. Letter Combinations of a Phone Number
18. 4Sum
19. Remove Nth Node From End of List
20. Valid Parentheses
21. Merge Two Sorted Lists
22. Generate Parentheses
23. Merge k Sorted Lists
24. Swap Nodes in Pairs
25. Reverse Nodes in k-Group
26. Remove Duplicates from Sorted Array
27. Remove Element
28. Find the Index of the First Occurrence in a String
29. Divide Two Integers
30. Substring with Concatenation of All Words
31. Next Permutation
32. Longest Valid Parentheses
33. Search in Rotated Sorted Array
34. Find First and Last Position of Element in Sorted Array
35. Search Insert Position
36. Valid Sudoku
37. Sudoku Solver
38. Count and Say
39. Combination Sum
40. Combination Sum II
41. First Missing Positive
42. Trapping Rain Water
43. Multiply Strings
44. Wildcard Matching
45. Jump Game II
46. Permutations
47. Permutations II
48. Rotate Image
49. Group Anagrams
50. Pow(x, n)
51. N-Queens
52. N-Queens II
53. Maximum Subarray
54. Spiral Matrix
55. Jump Game
56. Merge Intervals
57. Insert Interval
58. Length of Last Word
59. Spiral Matrix II
60. Permutation Sequence
61. Rotate List
62. Unique Paths
63. Unique Paths II
64. Minimum Path Sum
65. Valid Number
66. Plus One
67. Add Binary
68. Text Justification
69. Sqrt(x)
70. Climbing Stairs
71. Simplify Path
72. Edit Distance
73. Set Matrix Zeroes
74. Search a 2D Matrix
75. Sort Colors
76. Minimum Window Substring
77. Combinations
78. Subsets
79. Word Search
80. Remove Duplicates from Sorted Array II
81. Search in Rotated Sorted Array II
82. Remove Duplicates from Sorted List II
83. Remove Duplicates from Sorted List
84. Largest Rectangle in Histogram
85. Maximal Rectangle
86. Partition List
87. Scramble String
88. Merge Sorted Array
89. Gray Code
90. Subsets II
91. Decode Ways
92. Reverse Linked List II
93. Restore IP Addresses
94. Binary Tree Inorder Traversal
95. Unique Binary Search Trees II
96. Unique Binary Search Trees
97. Interleaving String
98. Validate Binary Search Tree
99. Recover Binary Search Tree
100. Same Tree
101. Symmetric Tree
102. Binary Tree Level Order Traversal
103. Binary Tree Zigzag Level Order Traversal
104. Maximum Depth of Binary Tree
105. Construct Binary Tree from Preorder and Inorder Traversal
106. Construct Binary Tree from Inorder and Postorder Traversal
107. Binary Tree Level Order Traversal II
108. Convert Sorted Array to Binary Search Tree
109. Convert Sorted List to Binary Search Tree
110. Balanced Binary Tree
111. Minimum Depth of Binary Tree
112. Path Sum
113. Path Sum II
114. Flatten Binary Tree to Linked List
115. Distinct Subsequences
116. Populating Next Right Pointers in Each Node
117. Populating Next Right Pointers in Each Node II
118. Pascal's Triangle
119. Pascal's Triangle II
120. Triangle
121. Best Time to Buy and Sell Stock
122. Best Time to Buy and Sell Stock II
123. Best Time to Buy and Sell Stock III
124. Binary Tree Maximum Path Sum
125. Valid Palindrome
126. Word Ladder II
127. Word Ladder
128. Longest Consecutive Sequence
129. Sum Root to Leaf Numbers
130. Surrounded Regions
131. Palindrome Partitioning
132. Palindrome Partitioning II
133. Clone Graph
134. Gas Station
135. Candy
136. Single Number
137. Single Number II
138. Copy List with Random Pointer
139. Word Break
140. Word Break II
141. Linked List Cycle
142. Linked List Cycle II
143. Reorder List
144. Binary Tree Preorder Traversal
145. Binary Tree Postorder Traversal
146. LRU Cache
147. Insertion Sort List
148. Sort List
149. Max Points on a Line
150. Evaluate Reverse Polish Notation
151. Reverse Words in a String
152. Maximum Product Subarray
153. Find Minimum in Rotated Sorted Array
154. Find Minimum in Rotated Sorted Array II
155. Min Stack
156. Binary Tree Upside Down
157. Read N Characters Given Read4
158. Read N Characters Given read4 II - Call Multiple Times
159. Longest Substring with At Most Two Distinct Characters
160. Intersection of Two Linked Lists
161. One Edit Distance
162. Find Peak Element
163. Missing Ranges
164. Maximum Gap
165. Compare Version Numbers
166. Fraction to Recurring Decimal
167. Two Sum II - Input Array Is Sorted
168. Excel Sheet Column Title
169. Majority Element
170. Two Sum III - Data structure design
171. Excel Sheet Column Number
172. Factorial Trailing Zeroes
173. Binary Search Tree Iterator
174. Dungeon Game
179. Largest Number
186. Reverse Words in a String II
187. Repeated DNA Sequences
188. Best Time to Buy and Sell Stock IV
189. Rotate Array
190. Reverse Bits
191. Number of 1 Bits
198. House Robber
199. Binary Tree Right Side View
200. Number of Islands
201. Bitwise AND of Numbers Range
202. Happy Number
203. Remove Linked List Elements
204. Count Primes
205. Isomorphic Strings
206. Reverse Linked List
207. Course Schedule
208. Implement Trie (Prefix Tree)
209. Minimum Size Subarray Sum
210. Course Schedule II
211. Design Add and Search Words Data Structure
212. Word Search II
213. House Robber II
214. Shortest Palindrome
215. Kth Largest Element in an Array
216. Combination Sum III
217. Contains Duplicate
218. The Skyline Problem
219. Contains Duplicate II
220. Contains Duplicate III
221. Maximal Square
222. Count Complete Tree Nodes
223. Rectangle Area
224. Basic Calculator
225. Implement Stack using Queues
226. Invert Binary Tree
227. Basic Calculator II
228. Summary Ranges
229. Majority Element II
230. Kth Smallest Element in a BST
231. Power of Two
232. Implement Queue using Stacks
233. Number of Digit One
234. Palindrome Linked List
235. Lowest Common Ancestor of a Binary Search Tree
236. Lowest Common Ancestor of a Binary Tree
237. Delete Node in a Linked List
238. Product of Array Except Self
239. Sliding Window Maximum
240. Search a 2D Matrix II
241. Different Ways to Add Parentheses
242. Valid Anagram
243. Shortest Word Distance
244. Shortest Word Distance II
245. Shortest Word Distance III
246. Strobogrammatic Number
247. Strobogrammatic Number II
248. Strobogrammatic Number III
249. Group Shifted Strings
250. Count Univalue Subtrees
251. Flatten 2D Vector
252. Meeting Rooms
253. Meeting Rooms II
254. Factor Combinations
255. Verify Preorder Sequence in Binary Search Tree
256. Paint House
257. Binary Tree Paths
258. Add Digits
259. 3Sum Smaller
260. Single Number III
261. Graph Valid Tree
263. Ugly Number
264. Ugly Number II
265. Paint House II
266. Palindrome Permutation
267. Palindrome Permutation II
268. Missing Number
269. Alien Dictionary
270. Closest Binary Search Tree Value
271. Encode and Decode Strings
272. Closest Binary Search Tree Value II
273. Integer to English Words
274. H-Index
275. H-Index II
276. Paint Fence
277. Find the Celebrity
278. First Bad Version
279. Perfect Squares
280. Wiggle Sort
281. Zigzag Iterator
282. Expression Add Operators
283. Move Zeroes
284. Peeking Iterator
285. Inorder Successor in BST
286. Walls and Gates
287. Find the Duplicate Number
288. Unique Word Abbreviation
289. Game of Life
290. Word Pattern
291. Word Pattern II
292. Nim Game
293. Flip Game
294. Flip Game II
295. Find Median from Data Stream
296. Best Meeting Point
297. Serialize and Deserialize Binary Tree
298. Binary Tree Longest Consecutive Sequence
299. Bulls and Cows
300. Longest Increasing Subsequence
301. Remove Invalid Parentheses
302. Smallest Rectangle Enclosing Black Pixels
303. Range Sum Query - Immutable
304. Range Sum Query 2D - Immutable
305. Number of Islands II
306. Additive Number
307. Range Sum Query - Mutable
308. Range Sum Query 2D - Mutable
309. Best Time to Buy and Sell Stock with Cooldown
310. Minimum Height Trees
311. Sparse Matrix Multiplication
312. Burst Balloons
313. Super Ugly Number
314. Binary Tree Vertical Order Traversal
315. Count of Smaller Numbers After Self
316. Remove Duplicate Letters
317. Shortest Distance from All Buildings
318. Maximum Product of Word Lengths
319. Bulb Switcher
320. Generalized Abbreviation
321. Create Maximum Number
322. Coin Change
323. Number of Connected Components in an Undirected Graph
324. Wiggle Sort II
325. Maximum Size Subarray Sum Equals k
326. Power of Three
327. Count of Range Sum
328. Odd Even Linked List
329. Longest Increasing Path in a Matrix
330. Patching Array
331. Verify Preorder Serialization of a Binary Tree
332. Reconstruct Itinerary
333. Largest BST Subtree
334. Increasing Triplet Subsequence
335. Self Crossing
336. Palindrome Pairs
337. House Robber III
338. Counting Bits
339. Nested List Weight Sum
340. Longest Substring with At Most K Distinct Characters
341. Flatten Nested List Iterator
342. Power of Four
343. Integer Break
344. Reverse String
345. Reverse Vowels of a String
346. Moving Average from Data Stream
347. Top K Frequent Elements
348. Design Tic-Tac-Toe
349. Intersection of Two Arrays
350. Intersection of Two Arrays II
351. Android Unlock Patterns
352. Data Stream as Disjoint Intervals
353. Design Snake Game
354. Russian Doll Envelopes
355. Design Twitter
356. Line Reflection
357. Count Numbers with Unique Digits
358. Rearrange String k Distance Apart
359. Logger Rate Limiter
360. Sort Transformed Array
361. Bomb Enemy
362. Design Hit Counter
363. Max Sum of Rectangle No Larger Than K
364. Nested List Weight Sum II
365. Water and Jug Problem
366. Find Leaves of Binary Tree
367. Valid Perfect Square
368. Largest Divisible Subset
369. Plus One Linked List
370. Range Addition
371. Sum of Two Integers
372. Super Pow
373. Find K Pairs with Smallest Sums
374. Guess Number Higher or Lower
375. Guess Number Higher or Lower II
376. Wiggle Subsequence
377. Combination Sum IV
378. Kth Smallest Element in a Sorted Matrix
379. Design Phone Directory
380. Insert Delete GetRandom O(1)
381. Insert Delete GetRandom O(1) - Duplicates allowed
382. Linked List Random Node
383. Ransom Note
384. Shuffle an Array
385. Mini Parser
386. Lexicographical Numbers
387. First Unique Character in a String
388. Longest Absolute File Path
389. Find the Difference
390. Elimination Game
391. Perfect Rectangle
392. Is Subsequence
393. UTF-8 Validation
394. Decode String
395. Longest Substring with At Least K Repeating Characters
396. Rotate Function
397. Integer Replacement
398. Random Pick Index
399. Evaluate Division
400. Nth Digit
401. Binary Watch
402. Remove K Digits
403. Frog Jump
404. Sum of Left Leaves
405. Convert a Number to Hexadecimal
406. Queue Reconstruction by Height
407. Trapping Rain Water II
408. Valid Word Abbreviation
409. Longest Palindrome
410. Split Array Largest Sum
411. Minimum Unique Word Abbreviation
412. Fizz Buzz
413. Arithmetic Slices
414. Third Maximum Number
415. Add Strings
416. Partition Equal Subset Sum
417. Pacific Atlantic Water Flow
418. Sentence Screen Fitting
419. Battleships in a Board
420. Strong Password Checker
421. Maximum XOR of Two Numbers in an Array
422. Valid Word Square
423. Reconstruct Original Digits from English
424. Longest Repeating Character Replacement
425. Word Squares
426. Convert Binary Search Tree to Sorted Doubly Linked List
427. Construct Quad Tree
428. Serialize and Deserialize N-ary Tree
429. N-ary Tree Level Order Traversal
430. Flatten a Multilevel Doubly Linked List
431. Encode N-ary Tree to Binary Tree
432. All O`one Data Structure
433. Minimum Genetic Mutation
434. Number of Segments in a String
435. Non-overlapping Intervals
436. Find Right Interval
437. Path Sum III
438. Find All Anagrams in a String
439. Ternary Expression Parser
440. K-th Smallest in Lexicographical Order
441. Arranging Coins
442. Find All Duplicates in an Array
443. String Compression
444. Sequence Reconstruction
445. Add Two Numbers II
446. Arithmetic Slices II - Subsequence
447. Number of Boomerangs
448. Find All Numbers Disappeared in an Array
449. Serialize and Deserialize BST
450. Delete Node in a BST
451. Sort Characters By Frequency
452. Minimum Number of Arrows to Burst Balloons
453. Minimum Moves to Equal Array Elements
454. 4Sum II
455. Assign Cookies
456. 132 Pattern
457. Circular Array Loop
458. Poor Pigs
459. Repeated Substring Pattern
460. LFU Cache
461. Hamming Distance
462. Minimum Moves to Equal Array Elements II
463. Island Perimeter
464. Can I Win
465. Optimal Account Balancing
466. Count The Repetitions
467. Unique Substrings in Wraparound String
468. Validate IP Address
469. Convex Polygon
470. Implement Rand10() Using Rand7()
471. Encode String with Shortest Length
472. Concatenated Words
473. Matchsticks to Square
474. Ones and Zeroes
475. Heaters
476. Number Complement
477. Total Hamming Distance
478. Generate Random Point in a Circle
479. Largest Palindrome Product
480. Sliding Window Median
481. Magical String
482. License Key Formatting
483. Smallest Good Base
484. Find Permutation
485. Max Consecutive Ones
486. Predict the Winner
487. Max Consecutive Ones II
488. Zuma Game
489. Robot Room Cleaner
490. The Maze
491. Non-decreasing Subsequences
492. Construct the Rectangle
493. Reverse Pairs
494. Target Sum
495. Teemo Attacking
496. Next Greater Element I
497. Random Point in Non-overlapping Rectangles
498. Diagonal Traverse
499. The Maze III
500. Keyboard Row
501. Find Mode in Binary Search Tree
502. IPO
503. Next Greater Element II
504. Base 7
505. The Maze II
506. Relative Ranks
507. Perfect Number
508. Most Frequent Subtree Sum
509. Fibonacci Number
510. Inorder Successor in BST II
513. Find Bottom Left Tree Value
514. Freedom Trail
515. Find Largest Value in Each Tree Row
516. Longest Palindromic Subsequence
517. Super Washing Machines
518. Coin Change II
519. Random Flip Matrix
520. Detect Capital
521. Longest Uncommon Subsequence I
522. Longest Uncommon Subsequence II
523. Continuous Subarray Sum
524. Longest Word in Dictionary through Deleting
525. Contiguous Array
526. Beautiful Arrangement
527. Word Abbreviation
528. Random Pick with Weight
529. Minesweeper
530. Minimum Absolute Difference in BST
531. Lonely Pixel I
532. K-diff Pairs in an Array
533. Lonely Pixel II
535. Encode and Decode TinyURL
536. Construct Binary Tree from String
537. Complex Number Multiplication
538. Convert BST to Greater Tree
539. Minimum Time Difference
540. Single Element in a Sorted Array
541. Reverse String II
542. 01 Matrix
543. Diameter of Binary Tree
544. Output Contest Matches
545. Boundary of Binary Tree
546. Remove Boxes
547. Number of Provinces
548. Split Array with Equal Sum
549. Binary Tree Longest Consecutive Sequence II
551. Student Attendance Record I
552. Student Attendance Record II
553. Optimal Division
554. Brick Wall
555. Split Concatenated Strings
556. Next Greater Element III
557. Reverse Words in a String III
558. Logical OR of Two Binary Grids Represented as Quad-Trees
559. Maximum Depth of N-ary Tree
560. Subarray Sum Equals K
561. Array Partition
562. Longest Line of Consecutive One in Matrix
563. Binary Tree Tilt
564. Find the Closest Palindrome
565. Array Nesting
566. Reshape the Matrix
567. Permutation in String
568. Maximum Vacation Days
572. Subtree of Another Tree
573. Squirrel Simulation
575. Distribute Candies
576. Out of Boundary Paths
581. Shortest Unsorted Continuous Subarray
582. Kill Process
583. Delete Operation for Two Strings
587. Erect the Fence
588. Design In-Memory File System
589. N-ary Tree Preorder Traversal
590. N-ary Tree Postorder Traversal
591. Tag Validator
592. Fraction Addition and Subtraction
593. Valid Square
594. Longest Harmonious Subsequence
598. Range Addition II
599. Minimum Index Sum of Two Lists
600. Non-negative Integers without Consecutive Ones
604. Design Compressed String Iterator
605. Can Place Flowers
606. Construct String from Binary Tree
609. Find Duplicate File in System
611. Valid Triangle Number
616. Add Bold Tag in String
617. Merge Two Binary Trees
621. Task Scheduler
622. Design Circular Queue
623. Add One Row to Tree
624. Maximum Distance in Arrays
625. Minimum Factorization
628. Maximum Product of Three Numbers
629. K Inverse Pairs Array
630. Course Schedule III
631. Design Excel Sum Formula
632. Smallest Range Covering Elements from K Lists
633. Sum of Square Numbers
634. Find the Derangement of An Array
635. Design Log Storage System
636. Exclusive Time of Functions
637. Average of Levels in Binary Tree
638. Shopping Offers
639. Decode Ways II
640. Solve the Equation
641. Design Circular Deque
642. Design Search Autocomplete System
643. Maximum Average Subarray I
644. Maximum Average Subarray II
645. Set Mismatch
646. Maximum Length of Pair Chain
647. Palindromic Substrings
648. Replace Words
649. Dota2 Senate
650. 2 Keys Keyboard
651. 4 Keys Keyboard
652. Find Duplicate Subtrees
653. Two Sum IV - Input is a BST
654. Maximum Binary Tree
655. Print Binary Tree
656. Coin Path
657. Robot Return to Origin
658. Find K Closest Elements
659. Split Array into Consecutive Subsequences
660. Remove 9
661. Image Smoother
662. Maximum Width of Binary Tree
663. Equal Tree Partition
664. Strange Printer
665. Non-decreasing Array
666. Path Sum IV
667. Beautiful Arrangement II
668. Kth Smallest Number in Multiplication Table
669. Trim a Binary Search Tree
670. Maximum Swap
671. Second Minimum Node In a Binary Tree
672. Bulb Switcher II
673. Number of Longest Increasing Subsequence
674. Longest Continuous Increasing Subsequence
675. Cut Off Trees for Golf Event
676. Implement Magic Dictionary
677. Map Sum Pairs
678. Valid Parenthesis String
679. 24 Game
680. Valid Palindrome II
681. Next Closest Time
682. Baseball Game
683. K Empty Slots
684. Redundant Connection
685. Redundant Connection II
686. Repeated String Match
687. Longest Univalue Path
688. Knight Probability in Chessboard
689. Maximum Sum of 3 Non-Overlapping Subarrays
690. Employee Importance
691. Stickers to Spell Word
692. Top K Frequent Words
693. Binary Number with Alternating Bits
694. Number of Distinct Islands
695. Max Area of Island
696. Count Binary Substrings
697. Degree of an Array
698. Partition to K Equal Sum Subsets
699. Falling Squares
700. Search in a Binary Search Tree
701. Insert into a Binary Search Tree
702. Search in a Sorted Array of Unknown Size
703. Kth Largest Element in a Stream
704. Binary Search
705. Design HashSet
706. Design HashMap
707. Design Linked List
708. Insert into a Sorted Circular Linked List
709. To Lower Case
710. Random Pick with Blacklist
711. Number of Distinct Islands II
712. Minimum ASCII Delete Sum for Two Strings
713. Subarray Product Less Than K
714. Best Time to Buy and Sell Stock with Transaction Fee
715. Range Module
716. Max Stack
717. 1-bit and 2-bit Characters
718. Maximum Length of Repeated Subarray
719. Find K-th Smallest Pair Distance
720. Longest Word in Dictionary
721. Accounts Merge
722. Remove Comments
723. Candy Crush
724. Find Pivot Index
725. Split Linked List in Parts
726. Number of Atoms
727. Minimum Window Subsequence
728. Self Dividing Numbers
729. My Calendar I
730. Count Different Palindromic Subsequences
731. My Calendar II
732. My Calendar III
733. Flood Fill
734. Sentence Similarity
735. Asteroid Collision
736. Parse Lisp Expression
737. Sentence Similarity II
738. Monotone Increasing Digits
739. Daily Temperatures
740. Delete and Earn
741. Cherry Pickup
742. Closest Leaf in a Binary Tree
743. Network Delay Time
744. Find Smallest Letter Greater Than Target
745. Prefix and Suffix Search
746. Min Cost Climbing Stairs
747. Largest Number At Least Twice of Others
748. Shortest Completing Word
749. Contain Virus
750. Number Of Corner Rectangles
751. IP to CIDR
752. Open the Lock
753. Cracking the Safe
754. Reach a Number
755. Pour Water
756. Pyramid Transition Matrix
757. Set Intersection Size At Least Two
758. Bold Words in String
759. Employee Free Time
760. Find Anagram Mappings
761. Special Binary String
762. Prime Number of Set Bits in Binary Representation
763. Partition Labels
764. Largest Plus Sign
765. Couples Holding Hands
766. Toeplitz Matrix
767. Reorganize String
768. Max Chunks To Make Sorted II
769. Max Chunks To Make Sorted
770. Basic Calculator IV
771. Jewels and Stones
772. Basic Calculator III
773. Sliding Puzzle
774. Minimize Max Distance to Gas Station
775. Global and Local Inversions
776. Split BST
777. Swap Adjacent in LR String
778. Swim in Rising Water
779. K-th Symbol in Grammar
780. Reaching Points
781. Rabbits in Forest
782. Transform to Chessboard
783. Minimum Distance Between BST Nodes
784. Letter Case Permutation
785. Is Graph Bipartite
786. K-th Smallest Prime Fraction
787. Cheapest Flights Within K Stops
788. Rotated Digits
789. Escape The Ghosts
790. Domino and Tromino Tiling
791. Custom Sort String
792. Number of Matching Subsequences
793. Preimage Size of Factorial Zeroes Function
794. Valid Tic-Tac-Toe State
795. Number of Subarrays with Bounded Maximum
796. Rotate String
797. All Paths From Source to Target
798. Smallest Rotation with Highest Score
799. Champagne Tower
800. Similar RGB Color
801. Minimum Swaps To Make Sequences Increasing
802. Find Eventual Safe States
803. Bricks Falling When Hit
804. Unique Morse Code Words
805. Split Array With Same Average
806. Number of Lines To Write String
807. Max Increase to Keep City Skyline
808. Soup Servings
809. Expressive Words
810. Chalkboard XOR Game
811. Subdomain Visit Count
812. Largest Triangle Area
813. Largest Sum of Averages
814. Binary Tree Pruning
815. Bus Routes
816. Ambiguous Coordinates
817. Linked List Components
818. Race Car
819. Most Common Word
820. Short Encoding of Words
821. Shortest Distance to a Character
822. Card Flipping Game
823. Binary Trees With Factors
824. Goat Latin
825. Friends Of Appropriate Ages
826. Most Profit Assigning Work
827. Making A Large Island
828. Count Unique Characters of All Substrings of a Given String
829. Consecutive Numbers Sum
830. Positions of Large Groups
831. Masking Personal Information
832. Flipping an Image
833. Find And Replace in String
834. Sum of Distances in Tree
835. Image Overlap
836. Rectangle Overlap
837. New 21 Game
838. Push Dominoes
839. Similar String Groups
840. Magic Squares In Grid
841. Keys and Rooms
842. Split Array into Fibonacci Sequence
843. Guess the Word
844. Backspace String Compare
845. Longest Mountain in Array
846. Hand of Straights
847. Shortest Path Visiting All Nodes
848. Shifting Letters
849. Maximize Distance to Closest Person
850. Rectangle Area II
851. Loud and Rich
852. Peak Index in a Mountain Array
853. Car Fleet
854. K-Similar Strings
855. Exam Room
856. Score of Parentheses
857. Minimum Cost to Hire K Workers
858. Mirror Reflection
859. Buddy Strings
860. Lemonade Change
861. Score After Flipping Matrix
862. Shortest Subarray with Sum at Least K
863. All Nodes Distance K in Binary Tree
864. Shortest Path to Get All Keys
865. Smallest Subtree with all the Deepest Nodes
866. Prime Palindrome
867. Transpose Matrix
868. Binary Gap
869. Reordered Power of 2
870. Advantage Shuffle
871. Minimum Number of Refueling Stops
872. Leaf-Similar Trees
873. Length of Longest Fibonacci Subsequence
874. Walking Robot Simulation
875. Koko Eating Bananas
876. Middle of the Linked List
877. Stone Game
878. Nth Magical Number
879. Profitable Schemes
880. Decoded String at Index
881. Boats to Save People
882. Reachable Nodes In Subdivided Graph
883. Projection Area of 3D Shapes
884. Uncommon Words from Two Sentences
885. Spiral Matrix III
886. Possible Bipartition
887. Super Egg Drop
888. Fair Candy Swap
889. Construct Binary Tree from Preorder and Postorder Traversal
890. Find and Replace Pattern
891. Sum of Subsequence Widths
892. Surface Area of 3D Shapes
893. Groups of Special-Equivalent Strings
894. All Possible Full Binary Trees
895. Maximum Frequency Stack
896. Monotonic Array
897. Increasing Order Search Tree
898. Bitwise ORs of Subarrays
899. Orderly Queue
900. RLE Iterator
901. Online Stock Span
902. Numbers At Most N Given Digit Set
903. Valid Permutations for DI Sequence
904. Fruit Into Baskets
905. Sort Array By Parity
906. Super Palindromes
907. Sum of Subarray Minimums
908. Smallest Range I
909. Snakes and Ladders
910. Smallest Range II
911. Online Election
912. Sort an Array
913. Cat and Mouse
914. X of a Kind in a Deck of Cards
915. Partition Array into Disjoint Intervals
916. Word Subsets
917. Reverse Only Letters
918. Maximum Sum Circular Subarray
919. Complete Binary Tree Inserter
920. Number of Music Playlists
921. Minimum Add to Make Parentheses Valid
922. Sort Array By Parity II
923. 3Sum With Multiplicity
924. Minimize Malware Spread
925. Long Pressed Name
926. Flip String to Monotone Increasing
927. Three Equal Parts
928. Minimize Malware Spread II
929. Unique Email Addresses
930. Binary Subarrays With Sum
931. Minimum Falling Path Sum
932. Beautiful Array
933. Number of Recent Calls
934. Shortest Bridge
935. Knight Dialer
936. Stamping The Sequence
937. Reorder Data in Log Files
938. Range Sum of BST
939. Minimum Area Rectangle
940. Distinct Subsequences II
941. Valid Mountain Array
942. DI String Match
943. Find the Shortest Superstring
944. Delete Columns to Make Sorted
945. Minimum Increment to Make Array Unique
946. Validate Stack Sequences
947. Most Stones Removed with Same Row or Column
948. Bag of Tokens
949. Largest Time for Given Digits
950. Reveal Cards In Increasing Order
951. Flip Equivalent Binary Trees
952. Largest Component Size by Common Factor
953. Verifying an Alien Dictionary
954. Array of Doubled Pairs
955. Delete Columns to Make Sorted II
956. Tallest Billboard
957. Prison Cells After N Days
958. Check Completeness of a Binary Tree
959. Regions Cut By Slashes
960. Delete Columns to Make Sorted III
961. N-Repeated Element in Size 2N Array
962. Maximum Width Ramp
963. Minimum Area Rectangle II
964. Least Operators to Express Number
965. Univalued Binary Tree
966. Vowel Spellchecker
967. Numbers With Same Consecutive Differences
968. Binary Tree Cameras
969. Pancake Sorting
970. Powerful Integers
971. Flip Binary Tree To Match Preorder Traversal
972. Equal Rational Numbers
973. K Closest Points to Origin
974. Subarray Sums Divisible by K
975. Odd Even Jump
976. Largest Perimeter Triangle
977. Squares of a Sorted Array
978. Longest Turbulent Subarray
979. Distribute Coins in Binary Tree
980. Unique Paths III
981. Time Based Key-Value Store
982. Triples with Bitwise AND Equal To Zero
983. Minimum Cost For Tickets
984. String Without AAA or BBB
985. Sum of Even Numbers After Queries
986. Interval List Intersections
987. Vertical Order Traversal of a Binary Tree
988. Smallest String Starting From Leaf
989. Add to Array-Form of Integer
990. Satisfiability of Equality Equations
991. Broken Calculator
992. Subarrays with K Different Integers
993. Cousins in Binary Tree
994. Rotting Oranges
995. Minimum Number of K Consecutive Bit Flips
996. Number of Squareful Arrays
997. Find the Town Judge
998. Maximum Binary Tree II
999. Available Captures for Rook
1000. Minimum Cost to Merge Stones
1001. Grid Illumination
1002. Find Common Characters
1003. Check If Word Is Valid After Substitutions
1004. Max Consecutive Ones III
1005. Maximize Sum Of Array After K Negations
1006. Clumsy Factorial
1007. Minimum Domino Rotations For Equal Row
1008. Construct Binary Search Tree from Preorder Traversal
1009. Complement of Base 10 Integer
1010. Pairs of Songs With Total Durations Divisible by 60
1011. Capacity To Ship Packages Within D Days
1012. Numbers With Repeated Digits
1013. Partition Array Into Three Parts With Equal Sum
1014. Best Sightseeing Pair
1015. Smallest Integer Divisible by K
1016. Binary String With Substrings Representing 1 To N
1017. Convert to Base -2
1018. Binary Prefix Divisible By 5
1019. Next Greater Node In Linked List
1020. Number of Enclaves
1021. Remove Outermost Parentheses
1022. Sum of Root To Leaf Binary Numbers
1023. Camelcase Matching
1024. Video Stitching
1025. Divisor Game
1026. Maximum Difference Between Node and Ancestor
1027. Longest Arithmetic Subsequence
1028. Recover a Tree From Preorder Traversal
1029. Two City Scheduling
1030. Matrix Cells in Distance Order
1031. Maximum Sum of Two Non-Overlapping Subarrays
1032. Stream of Characters
1033. Moving Stones Until Consecutive
1034. Coloring A Border
1035. Uncrossed Lines
1036. Escape a Large Maze
1037. Valid Boomerang
1038. Binary Search Tree to Greater Sum Tree
1039. Minimum Score Triangulation of Polygon
1040. Moving Stones Until Consecutive II
1041. Robot Bounded In Circle
1042. Flower Planting With No Adjacent
1043. Partition Array for Maximum Sum
1044. Longest Duplicate Substring
1046. Last Stone Weight
1047. Remove All Adjacent Duplicates In String
1048. Longest String Chain
1049. Last Stone Weight II
1051. Height Checker
1052. Grumpy Bookstore Owner
1053. Previous Permutation With One Swap
1054. Distant Barcodes
1055. Shortest Way to Form String
1056. Confusing Number
1057. Campus Bikes
1058. Minimize Rounding Error to Meet Target
1059. All Paths from Source Lead to Destination
1060. Missing Element in Sorted Array
1061. Lexicographically Smallest Equivalent String
1062. Longest Repeating Substring
1063. Number of Valid Subarrays
1064. Fixed Point
1065. Index Pairs of a String
1066. Campus Bikes II
1067. Digit Count in Range
1071. Greatest Common Divisor of Strings
1072. Flip Columns For Maximum Number of Equal Rows
1073. Adding Two Negabinary Numbers
1074. Number of Submatrices That Sum to Target
1078. Occurrences After Bigram
1079. Letter Tile Possibilities
1080. Insufficient Nodes in Root to Leaf Paths
1081. Smallest Subsequence of Distinct Characters
1085. Sum of Digits in the Minimum Number
1086. High Five
1087. Brace Expansion
1088. Confusing Number II
1089. Duplicate Zeros
1090. Largest Values From Labels
1091. Shortest Path in Binary Matrix
1092. Shortest Common Supersequence
1093. Statistics from a Large Sample
1094. Car Pooling
1095. Find in Mountain Array
1096. Brace Expansion II
1099. Two Sum Less Than K
1100. Find K-Length Substrings With No Repeated Characters
1101. The Earliest Moment When Everyone Become Friends
1102. Path With Maximum Minimum Value
1103. Distribute Candies to People
1104. Path In Zigzag Labelled Binary Tree
1105. Filling Bookcase Shelves
1106. Parsing A Boolean Expression
1108. Defanging an IP Address
1109. Corporate Flight Bookings
1110. Delete Nodes And Return Forest
1111. Maximum Nesting Depth of Two Valid Parentheses Strings
1114. Print in Order
1115. Print FooBar Alternately
1116. Print Zero Even Odd
1117. Building H2O
1118. Number of Days in a Month
1119. Remove Vowels from a String
1120. Maximum Average Subtree
1121. Divide Array Into Increasing Sequences
1122. Relative Sort Array
1123. Lowest Common Ancestor of Deepest Leaves
1124. Longest Well-Performing Interval
1125. Smallest Sufficient Team
1128. Number of Equivalent Domino Pairs
1129. Shortest Path with Alternating Colors
1130. Minimum Cost Tree From Leaf Values
1131. Maximum of Absolute Value Expression
1133. Largest Unique Number
1134. Armstrong Number
1135. Connecting Cities With Minimum Cost
1136. Parallel Courses
1137. N-th Tribonacci Number
1138. Alphabet Board Path
1139. Largest 1-Bordered Square
1140. Stone Game II
1143. Longest Common Subsequence
1144. Decrease Elements To Make Array Zigzag
1145. Binary Tree Coloring Game
1146. Snapshot Array
1147. Longest Chunked Palindrome Decomposition
1150. Check If a Number Is Majority Element in a Sorted Array
1151. Minimum Swaps to Group All 1's Together
1152. Analyze User Website Visit Pattern
1153. String Transforms Into Another String
1154. Day of the Year
1155. Number of Dice Rolls With Target Sum
1156. Swap For Longest Repeated Character Substring
1157. Online Majority Element In Subarray
1160. Find Words That Can Be Formed by Characters
1161. Maximum Level Sum of a Binary Tree
1162. As Far from Land as Possible
1163. Last Substring in Lexicographical Order
1165. Single-Row Keyboard
1166. Design File System
1167. Minimum Cost to Connect Sticks
1168. Optimize Water Distribution in a Village
1169. Invalid Transactions
1170. Compare Strings by Frequency of the Smallest Character
1171. Remove Zero Sum Consecutive Nodes from Linked List
1172. Dinner Plate Stacks
1175. Prime Arrangements
1176. Diet Plan Performance
1177. Can Make Palindrome from Substring
1178. Number of Valid Words for Each Puzzle
1180. Count Substrings with Only One Distinct Letter
1181. Before and After Puzzle
1182. Shortest Distance to Target Color
1183. Maximum Number of Ones
1184. Distance Between Bus Stops
1185. Day of the Week
1186. Maximum Subarray Sum with One Deletion
1187. Make Array Strictly Increasing
1188. Design Bounded Blocking Queue
1189. Maximum Number of Balloons
1190. Reverse Substrings Between Each Pair of Parentheses
1191. K-Concatenation Maximum Sum
1192. Critical Connections in a Network
1195. Fizz Buzz Multithreaded
1196. How Many Apples Can You Put into the Basket
1197. Minimum Knight Moves
1198. Find Smallest Common Element in All Rows
1199. Minimum Time to Build Blocks
1200. Minimum Absolute Difference
1201. Ugly Number III
1202. Smallest String With Swaps
1203. Sort Items by Groups Respecting Dependencies
1206. Design Skiplist
1207. Unique Number of Occurrences
1208. Get Equal Substrings Within Budget
1209. Remove All Adjacent Duplicates in String II
1210. Minimum Moves to Reach Target with Rotations
1213. Intersection of Three Sorted Arrays
1214. Two Sum BSTs
1215. Stepping Numbers
1216. Valid Palindrome III
1217. Minimum Cost to Move Chips to The Same Position
1218. Longest Arithmetic Subsequence of Given Difference
1219. Path with Maximum Gold
1220. Count Vowels Permutation
1221. Split a String in Balanced Strings
1222. Queens That Can Attack the King
1223. Dice Roll Simulation
1224. Maximum Equal Frequency
1226. The Dining Philosophers
1227. Airplane Seat Assignment Probability
1228. Missing Number In Arithmetic Progression
1229. Meeting Scheduler
1230. Toss Strange Coins
1231. Divide Chocolate
1232. Check If It Is a Straight Line
1233. Remove Sub-Folders from the Filesystem
1234. Replace the Substring for Balanced String
1235. Maximum Profit in Job Scheduling
1236. Web Crawler
1237. Find Positive Integer Solution for a Given Equation
1238. Circular Permutation in Binary Representation
1239. Maximum Length of a Concatenated String with Unique Characters
1240. Tiling a Rectangle with the Fewest Squares
1242. Web Crawler Multithreaded
1243. Array Transformation
1244. Design A Leaderboard
1245. Tree Diameter
1246. Palindrome Removal
1247. Minimum Swaps to Make Strings Equal
1248. Count Number of Nice Subarrays
1249. Minimum Remove to Make Valid Parentheses
1250. Check If It Is a Good Array
1252. Cells with Odd Values in a Matrix
1253. Reconstruct a 2-Row Binary Matrix
1254. Number of Closed Islands
1255. Maximum Score Words Formed by Letters
1256. Encode Number
1257. Smallest Common Region
1258. Synonymous Sentences
1259. Handshakes That Don't Cross
1260. Shift 2D Grid
1261. Find Elements in a Contaminated Binary Tree
1262. Greatest Sum Divisible by Three
1263. Minimum Moves to Move a Box to Their Target Location
1265. Print Immutable Linked List in Reverse
1266. Minimum Time Visiting All Points
1267. Count Servers that Communicate
1268. Search Suggestions System
1269. Number of Ways to Stay in the Same Place After Some Steps
1271. Hexspeak
1272. Remove Interval
1273. Delete Tree Nodes
1274. Number of Ships in a Rectangle
1275. Find Winner on a Tic Tac Toe Game
1276. Number of Burgers with No Waste of Ingredients
1277. Count Square Submatrices with All Ones
1278. Palindrome Partitioning III
1279. Traffic Light Controlled Intersection
1281. Subtract the Product and Sum of Digits of an Integer
1282. Group the People Given the Group Size They Belong To
1283. Find the Smallest Divisor Given a Threshold
1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
1286. Iterator for Combination
1287. Element Appearing More Than 25% In Sorted Array
1288. Remove Covered Intervals
1289. Minimum Falling Path Sum II
1290. Convert Binary Number in a Linked List to Integer
1291. Sequential Digits
1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
1293. Shortest Path in a Grid with Obstacles Elimination
1295. Find Numbers with Even Number of Digits
1296. Divide Array in Sets of K Consecutive Numbers
1297. Maximum Number of Occurrences of a Substring
1298. Maximum Candies You Can Get from Boxes
1299. Replace Elements with Greatest Element on Right Side
1300. Sum of Mutated Array Closest to Target
1301. Number of Paths with Max Score
1302. Deepest Leaves Sum
1304. Find N Unique Integers Sum up to Zero
1305. All Elements in Two Binary Search Trees
1306. Jump Game III
1307. Verbal Arithmetic Puzzle
1309. Decrypt String from Alphabet to Integer Mapping
1310. XOR Queries of a Subarray
1311. Get Watched Videos by Your Friends
1312. Minimum Insertion Steps to Make a String Palindrome
1313. Decompress Run-Length Encoded List
1314. Matrix Block Sum
1315. Sum of Nodes with Even-Valued Grandparent
1316. Distinct Echo Substrings
1317. Convert Integer to the Sum of Two No-Zero Integers
1318. Minimum Flips to Make a OR b Equal to c
1319. Number of Operations to Make Network Connected
1320. Minimum Distance to Type a Word Using Two Fingers
1323. Maximum 69 Number
1324. Print Words Vertically
1325. Delete Leaves With a Given Value
1326. Minimum Number of Taps to Open to Water a Garden
1328. Break a Palindrome
1329. Sort the Matrix Diagonally
1330. Reverse Subarray To Maximize Array Value
1331. Rank Transform of an Array
1332. Remove Palindromic Subsequences
1333. Filter Restaurants by Vegan-Friendly, Price and Distance
1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance
1335. Minimum Difficulty of a Job Schedule
1337. The K Weakest Rows in a Matrix
1338. Reduce Array Size to The Half
1339. Maximum Product of Splitted Binary Tree
1340. Jump Game V
1342. Number of Steps to Reduce a Number to Zero
1343. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
1344. Angle Between Hands of a Clock
1345. Jump Game IV
1346. Check If N and Its Double Exist
1347. Minimum Number of Steps to Make Two Strings Anagram
1348. Tweet Counts Per Frequency
1349. Maximum Students Taking Exam
1351. Count Negative Numbers in a Sorted Matrix
1352. Product of the Last K Numbers
1353. Maximum Number of Events That Can Be Attended
1354. Construct Target Array With Multiple Sums
1356. Sort Integers by The Number of 1 Bits
1357. Apply Discount Every n Orders
1358. Number of Substrings Containing All Three Characters
1359. Count All Valid Pickup and Delivery Options
1360. Number of Days Between Two Dates
1361. Validate Binary Tree Nodes
1362. Closest Divisors
1363. Largest Multiple of Three
1365. How Many Numbers Are Smaller Than the Current Number
1366. Rank Teams by Votes
1367. Linked List in Binary Tree
1368. Minimum Cost to Make at Least One Valid Path in a Grid
1370. Increasing Decreasing String
1371. Find the Longest Substring Containing Vowels in Even Counts
1372. Longest ZigZag Path in a Binary Tree
1373. Maximum Sum BST in Binary Tree
1374. Generate a String With Characters That Have Odd Counts
1375. Number of Times Binary String Is Prefix-Aligned
1376. Time Needed to Inform All Employees
1377. Frog Position After T Seconds
1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree
1380. Lucky Numbers in a Matrix
1381. Design a Stack With Increment Operation
1382. Balance a Binary Search Tree
1383. Maximum Performance of a Team
1385. Find the Distance Value Between Two Arrays
1386. Cinema Seat Allocation
1387. Sort Integers by The Power Value
1388. Pizza With 3n Slices
1389. Create Target Array in the Given Order
1390. Four Divisors
1391. Check if There is a Valid Path in a Grid
1392. Longest Happy Prefix
1394. Find Lucky Integer in an Array
1395. Count Number of Teams
1396. Design Underground System
1397. Find All Good Strings
1399. Count Largest Group
1400. Construct K Palindrome Strings
1401. Circle and Rectangle Overlapping
1402. Reducing Dishes
1403. Minimum Subsequence in Non-Increasing Order
1404. Number of Steps to Reduce a Number in Binary Representation to One
1405. Longest Happy String
1406. Stone Game III
1408. String Matching in an Array
1409. Queries on a Permutation With Key
1410. HTML Entity Parser
1411. Number of Ways to Paint N × 3 Grid
1413. Minimum Value to Get Positive Step by Step Sum
1414. Find the Minimum Number of Fibonacci Numbers Whose Sum Is K
1415. The k-th Lexicographical String of All Happy Strings of Length n
1416. Restore The Array
1417. Reformat The String
1418. Display Table of Food Orders in a Restaurant
1419. Minimum Number of Frogs Croaking
1420. Build Array Where You Can Find The Maximum Exactly K Comparisons
1422. Maximum Score After Splitting a String
1423. Maximum Points You Can Obtain from Cards
1424. Diagonal Traverse II
1425. Constrained Subsequence Sum
1426. Counting Elements
1427. Perform String Shifts
1428. Leftmost Column with at Least a One
1429. First Unique Number
1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree
1431. Kids With the Greatest Number of Candies
1432. Max Difference You Can Get From Changing an Integer
1433. Check If a String Can Break Another String
1434. Number of Ways to Wear Different Hats to Each Other
1436. Destination City
1437. Check If All 1's Are at Least Length K Places Away
1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows
1441. Build an Array With Stack Operations
1442. Count Triplets That Can Form Two Arrays of Equal XOR
1443. Minimum Time to Collect All Apples in a Tree
1444. Number of Ways of Cutting a Pizza
1446. Consecutive Characters
1447. Simplified Fractions
1448. Count Good Nodes in Binary Tree
1449. Form Largest Integer With Digits That Add up to Target
1450. Number of Students Doing Homework at a Given Time
1451. Rearrange Words in a Sentence
1452. People Whose List of Favorite Companies Is Not a Subset of Another List
1453. Maximum Number of Darts Inside of a Circular Dartboard
1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence
1456. Maximum Number of Vowels in a Substring of Given Length
1457. Pseudo-Palindromic Paths in a Binary Tree
1458. Max Dot Product of Two Subsequences
1460. Make Two Arrays Equal by Reversing Subarrays
1461. Check If a String Contains All Binary Codes of Size K
1462. Course Schedule IV
1463. Cherry Pickup II
1464. Maximum Product of Two Elements in an Array
1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts
1466. Reorder Routes to Make All Paths Lead to the City Zero
1467. Probability of a Two Boxes Having The Same Number of Distinct Balls
1469. Find All The Lonely Nodes
1470. Shuffle the Array
1471. The k Strongest Values in an Array
1472. Design Browser History
1473. Paint House III
1474. Delete N Nodes After M Nodes of a Linked List
1475. Final Prices With a Special Discount in a Shop
1476. Subrectangle Queries
1477. Find Two Non-overlapping Sub-arrays Each With Target Sum
1478. Allocate Mailboxes
1480. Running Sum of 1d Array
1481. Least Number of Unique Integers after K Removals
1482. Minimum Number of Days to Make m Bouquets
1483. Kth Ancestor of a Tree Node
1485. Clone Binary Tree With Random Pointer
1486. XOR Operation in an Array
1487. Making File Names Unique
1488. Avoid Flood in The City
1489. Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree
1490. Clone N-ary Tree
1491. Average Salary Excluding the Minimum and Maximum Salary
1492. The kth Factor of n
1493. Longest Subarray of 1's After Deleting One Element
1494. Parallel Courses II
1496. Path Crossing
1497. Check If Array Pairs Are Divisible by k
1498. Number of Subsequences That Satisfy the Given Sum Condition
1499. Max Value of Equation
1500. Design a File Sharing System
1502. Can Make Arithmetic Progression From Sequence
1503. Last Moment Before All Ants Fall Out of a Plank
1504. Count Submatrices With All Ones
1505. Minimum Possible Integer After at Most K Adjacent Swaps On Digits
1506. Find Root of N-Ary Tree
1507. Reformat Date
1508. Range Sum of Sorted Subarray Sums
1509. Minimum Difference Between Largest and Smallest Value in Three Moves
1510. Stone Game IV
1512. Number of Good Pairs
1513. Number of Substrings With Only 1s
1514. Path with Maximum Probability
1515. Best Position for a Service Centre
1516. Move Sub-Tree of N-Ary Tree
1518. Water Bottles
1519. Number of Nodes in the Sub-Tree With the Same Label
1520. Maximum Number of Non-Overlapping Substrings
1521. Find a Value of a Mysterious Function Closest to Target
1522. Diameter of N-Ary Tree
1523. Count Odd Numbers in an Interval Range
1524. Number of Sub-arrays With Odd Sum
1525. Number of Good Ways to Split a String
1526. Minimum Number of Increments on Subarrays to Form a Target Array
1528. Shuffle String
1529. Minimum Suffix Flips
1530. Number of Good Leaf Nodes Pairs
1531. String Compression II
1533. Find the Index of the Large Integer
1534. Count Good Triplets
1535. Find the Winner of an Array Game
1536. Minimum Swaps to Arrange a Binary Grid
1537. Get the Maximum Score
1538. Guess the Majority in a Hidden Array
1539. Kth Missing Positive Number
1540. Can Convert String in K Moves
1541. Minimum Insertions to Balance a Parentheses String
1542. Find Longest Awesome Substring
1544. Make The String Great
1545. Find Kth Bit in Nth Binary String
1546. Maximum Number of Non-Overlapping Subarrays With Sum Equals Target
1547. Minimum Cost to Cut a Stick
1548. The Most Similar Path in a Graph
1550. Three Consecutive Odds
1551. Minimum Operations to Make Array Equal
1552. Magnetic Force Between Two Balls
1553. Minimum Number of Days to Eat N Oranges
1554. Strings Differ by One Character
1556. Thousand Separator
1557. Minimum Number of Vertices to Reach All Nodes
1558. Minimum Numbers of Function Calls to Make Target Array
1559. Detect Cycles in 2D Grid
1560. Most Visited Sector in a Circular Track
1561. Maximum Number of Coins You Can Get
1562. Find Latest Group of Size M
1563. Stone Game V
1564. Put Boxes Into the Warehouse I
1566. Detect Pattern of Length M Repeated K or More Times
1567. Maximum Length of Subarray With Positive Product
1568. Minimum Number of Days to Disconnect Island
1569. Number of Ways to Reorder Array to Get Same BST
1570. Dot Product of Two Sparse Vectors
1572. Matrix Diagonal Sum
1573. Number of Ways to Split a String
1574. Shortest Subarray to be Removed to Make Array Sorted
1575. Count All Possible Routes
1576. Replace All 's to Avoid Consecutive Repeating Characters
1577. Number of Ways Where Square of Number Is Equal to Product of Two Numbers
1578. Minimum Time to Make Rope Colorful
1579. Remove Max Number of Edges to Keep Graph Fully Traversable
1580. Put Boxes Into the Warehouse II
1582. Special Positions in a Binary Matrix
1583. Count Unhappy Friends
1584. Min Cost to Connect All Points
1585. Check If String Is Transformable With Substring Sort Operations
1588. Sum of All Odd Length Subarrays
1589. Maximum Sum Obtained of Any Permutation
1590. Make Sum Divisible by P
1591. Strange Printer II
1592. Rearrange Spaces Between Words
1593. Split a String Into the Max Number of Unique Substrings
1594. Maximum Non Negative Product in a Matrix
1595. Minimum Cost to Connect Two Groups of Points
1597. Build Binary Expression Tree From Infix Expression
1598. Crawler Log Folder
1599. Maximum Profit of Operating a Centennial Wheel
1600. Throne Inheritance
1601. Maximum Number of Achievable Transfer Requests
1602. Find Nearest Right Node in Binary Tree
1603. Design Parking System
1604. Alert Using Same Key-Card Three or More Times in a One Hour Period
1605. Find Valid Matrix Given Row and Column Sums
1606. Find Servers That Handled Most Number of Requests
1608. Special Array With X Elements Greater Than or Equal X
1609. Even Odd Tree
1610. Maximum Number of Visible Points
1611. Minimum One Bit Operations to Make Integers Zero
1612. Check If Two Expression Trees are Equivalent
1614. Maximum Nesting Depth of the Parentheses
1615. Maximal Network Rank
1616. Split Two Strings to Make Palindrome
1617. Count Subtrees With Max Distance Between Cities
1618. Maximum Font to Fit a Sentence in a Screen
1619. Mean of Array After Removing Some Elements
1620. Coordinate With Maximum Network Quality
1621. Number of Sets of K Non-Overlapping Line Segments
1622. Fancy Sequence
1624. Largest Substring Between Two Equal Characters
1625. Lexicographically Smallest String After Applying Operations
1626. Best Team With No Conflicts
1627. Graph Connectivity With Threshold
1628. Design an Expression Tree With Evaluate Function
1629. Slowest Key
1630. Arithmetic Subarrays
1631. Path With Minimum Effort
1632. Rank Transform of a Matrix
1634. Add Two Polynomials Represented as Linked Lists
1636. Sort Array by Increasing Frequency
1637. Widest Vertical Area Between Two Points Containing No Points
1638. Count Substrings That Differ by One Character
1639. Number of Ways to Form a Target String Given a Dictionary
1640. Check Array Formation Through Concatenation
1641. Count Sorted Vowel Strings
1642. Furthest Building You Can Reach
1643. Kth Smallest Instructions
1644. Lowest Common Ancestor of a Binary Tree II
1646. Get Maximum in Generated Array
1647. Minimum Deletions to Make Character Frequencies Unique
1648. Sell Diminishing-Valued Colored Balls
1649. Create Sorted Array through Instructions
1650. Lowest Common Ancestor of a Binary Tree III
1652. Defuse the Bomb
1653. Minimum Deletions to Make String Balanced
1654. Minimum Jumps to Reach Home
1655. Distribute Repeating Integers
1656. Design an Ordered Stream
1657. Determine if Two Strings Are Close
1658. Minimum Operations to Reduce X to Zero
1659. Maximize Grid Happiness
1660. Correct a Binary Tree
1662. Check If Two String Arrays are Equivalent
1663. Smallest String With A Given Numeric Value
1664. Ways to Make a Fair Array
1665. Minimum Initial Energy to Finish Tasks
1666. Change the Root of a Binary Tree
1668. Maximum Repeating Substring
1669. Merge In Between Linked Lists
1670. Design Front Middle Back Queue
1671. Minimum Number of Removals to Make Mountain Array
1672. Richest Customer Wealth
1673. Find the Most Competitive Subsequence
1674. Minimum Moves to Make Array Complementary
1675. Minimize Deviation in Array
1676. Lowest Common Ancestor of a Binary Tree IV
1678. Goal Parser Interpretation
1679. Max Number of K-Sum Pairs
1680. Concatenation of Consecutive Binary Numbers
1681. Minimum Incompatibility
1682. Longest Palindromic Subsequence II
1684. Count the Number of Consistent Strings
1685. Sum of Absolute Differences in a Sorted Array
1686. Stone Game VI
1687. Delivering Boxes from Storage to Ports
1688. Count of Matches in Tournament
1689. Partitioning Into Minimum Number Of Deci-Binary Numbers
1690. Stone Game VII
1691. Maximum Height by Stacking Cuboids
1692. Count Ways to Distribute Candies
1694. Reformat Phone Number
1695. Maximum Erasure Value
1696. Jump Game VI
1697. Checking Existence of Edge Length Limited Paths
1698. Number of Distinct Substrings in a String
1700. Number of Students Unable to Eat Lunch
1701. Average Waiting Time
1702. Maximum Binary String After Change
1703. Minimum Adjacent Swaps for K Consecutive Ones
1704. Determine if String Halves Are Alike
1705. Maximum Number of Eaten Apples
1706. Where Will the Ball Fall
1707. Maximum XOR With an Element From Array
1708. Largest Subarray Length K
1709. Biggest Window Between Visits
1710. Maximum Units on a Truck
1711. Count Good Meals
1712. Ways to Split Array Into Three Subarrays
1713. Minimum Operations to Make a Subsequence
1714. Sum Of Special Evenly-Spaced Elements In Array
1716. Calculate Money in Leetcode Bank
1717. Maximum Score From Removing Substrings
1718. Construct the Lexicographically Largest Valid Sequence
1719. Number Of Ways To Reconstruct A Tree
1720. Decode XORed Array
1721. Swapping Nodes in a Linked List
1722. Minimize Hamming Distance After Swap Operations
1723. Find Minimum Time to Finish All Jobs
1724. Checking Existence of Edge Length Limited Paths II
1725. Number Of Rectangles That Can Form The Largest Square
1726. Tuple with Same Product
1727. Largest Submatrix With Rearrangements
1728. Cat and Mouse II
1730. Shortest Path to Get Food
1732. Find the Highest Altitude
1733. Minimum Number of People to Teach
1734. Decode XORed Permutation
1735. Count Ways to Make Array With Product
1736. Latest Time by Replacing Hidden Digits
1737. Change Minimum Characters to Satisfy One of Three Conditions
1738. Find Kth Largest XOR Coordinate Value
1739. Building Boxes
1740. Find Distance in a Binary Tree
1742. Maximum Number of Balls in a Box
1743. Restore the Array From Adjacent Pairs
1744. Can You Eat Your Favorite Candy on Your Favorite Day
1745. Palindrome Partitioning IV
1746. Maximum Subarray Sum After One Operation
1748. Sum of Unique Elements
1749. Maximum Absolute Sum of Any Subarray
1750. Minimum Length of String After Deleting Similar Ends
1751. Maximum Number of Events That Can Be Attended II
1752. Check if Array Is Sorted and Rotated
1753. Maximum Score From Removing Stones
1754. Largest Merge Of Two Strings
1755. Closest Subsequence Sum
1756. Design Most Recently Used Queue
1758. Minimum Changes To Make Alternating Binary String
1759. Count Number of Homogenous Substrings
1760. Minimum Limit of Balls in a Bag
1761. Minimum Degree of a Connected Trio in a Graph
1762. Buildings With an Ocean View
1763. Longest Nice Substring
1764. Form Array by Concatenating Subarrays of Another Array
1765. Map of Highest Peak
1766. Tree of Coprimes
1768. Merge Strings Alternately
1769. Minimum Number of Operations to Move All Balls to Each Box
1770. Maximum Score from Performing Multiplication Operations
1771. Maximize Palindrome Length From Subsequences
1772. Sort Features by Popularity
1773. Count Items Matching a Rule
1774. Closest Dessert Cost
1775. Equal Sum Arrays With Minimum Number of Operations
1776. Car Fleet II
1778. Shortest Path in a Hidden Grid
1779. Find Nearest Point That Has the Same X or Y Coordinate
1780. Check if Number is a Sum of Powers of Three
1781. Sum of Beauty of All Substrings
1782. Count Pairs Of Nodes
1784. Check if Binary String Has at Most One Segment of Ones
1785. Minimum Elements to Add to Form a Given Sum
1786. Number of Restricted Paths From First to Last Node
1787. Make the XOR of All Segments Equal to Zero
1788. Maximize the Beauty of the Garden
1790. Check if One String Swap Can Make Strings Equal
1791. Find Center of Star Graph
1792. Maximum Average Pass Ratio
1793. Maximum Score of a Good Subarray
1794. Count Pairs of Equal Substrings With Minimum Difference
1796. Second Largest Digit in a String
1797. Design Authentication Manager
1798. Maximum Number of Consecutive Values You Can Make
1799. Maximize Score After N Operations
1800. Maximum Ascending Subarray Sum
1801. Number of Orders in the Backlog
1802. Maximum Value at a Given Index in a Bounded Array
1803. Count Pairs With XOR in a Range
1804. Implement Trie II (Prefix Tree)
1805. Number of Different Integers in a String
1806. Minimum Number of Operations to Reinitialize a Permutation
1807. Evaluate the Bracket Pairs of a String
1808. Maximize Number of Nice Divisors
1810. Minimum Path Cost in a Hidden Grid
1811. Find Interview Candidates
1812. Determine Color of a Chessboard Square
1813. Sentence Similarity III
1814. Count Nice Pairs in an Array
1815. Maximum Number of Groups Getting Fresh Donuts
1816. Truncate Sentence
1817. Finding the Users Active Minutes
1818. Minimum Absolute Sum Difference
1819. Number of Different Subsequences GCDs
1820. Maximum Number of Accepted Invitations
1821. Find Customers With Positive Revenue this Year
1822. Sign of the Product of an Array
1823. Find the Winner of the Circular Game
1824. Minimum Sideway Jumps
1825. Finding MK Average
1826. Faulty Sensor
1827. Minimum Operations to Make the Array Increasing
1828. Queries on Number of Points Inside a Circle
1829. Maximum XOR for Each Query
1830. Minimum Number of Operations to Make String Sorted
1831. Maximum Transaction Each Day
1832. Check if the Sentence Is Pangram
1833. Maximum Ice Cream Bars
1834. Single-Threaded CPU
1835. Find XOR Sum of All Pairs Bitwise AND
1836. Remove Duplicates From an Unsorted Linked List
1837. Sum of Digits in Base K
1838. Frequency of the Most Frequent Element
1839. Longest Substring Of All Vowels in Order
1840. Maximum Building Height
1841. League Statistics
1842. Next Palindrome Using Same Digits
1844. Replace All Digits with Characters
1845. Seat Reservation Manager
1846. Maximum Element After Decreasing and Rearranging
1847. Closest Room
1848. Minimum Distance to the Target Element
1849. Splitting a String Into Descending Consecutive Values
1850. Minimum Adjacent Swaps to Reach the Kth Smallest Number
1851. Minimum Interval to Include Each Query
1852. Distinct Numbers in Each Subarray
1853. Convert Date Format
1854. Maximum Population Year
1855. Maximum Distance Between a Pair of Values
1856. Maximum Subarray Min-Product
1857. Largest Color Value in a Directed Graph
1858. Longest Word With All Prefixes
1859. Sorting the Sentence
1860. Incremental Memory Leak
1861. Rotating the Box
1862. Sum of Floored Pairs
1863. Sum of All Subset XOR Totals
1864. Minimum Number of Swaps to Make the Binary String Alternating
1865. Finding Pairs With a Certain Sum
1866. Number of Ways to Rearrange Sticks With K Sticks Visible
1868. Product of Two Run-Length Encoded Arrays
1869. Longer Contiguous Segments of Ones than Zeros
1870. Minimum Speed to Arrive on Time
1871. Jump Game VII
1872. Stone Game VIII
1874. Minimize Product Sum of Two Arrays
1876. Substrings of Size Three with Distinct Characters
1877. Minimize Maximum Pair Sum in Array
1878. Get Biggest Three Rhombus Sums in a Grid
1879. Minimum XOR Sum of Two Arrays
1880. Check if Word Equals Summation of Two Words
1881. Maximum Value after Insertion
1882. Process Tasks Using Servers
1883. Minimum Skips to Arrive at Meeting On Time
1884. Egg Drop With 2 Eggs and N Floors
1885. Count Pairs in Two Arrays
1886. Determine Whether Matrix Can Be Obtained By Rotation
1887. Reduction Operations to Make the Array Elements Equal
1888. Minimum Number of Flips to Make the Binary String Alternating
1889. Minimum Space Wasted From Packaging
1891. Cutting Ribbons
1893. Check if All the Integers in a Range Are Covered
1894. Find the Student that Will Replace the Chalk
1895. Largest Magic Square
1896. Minimum Cost to Change the Final Value of Expression
1897. Redistribute Characters to Make All Strings Equal
1898. Maximum Number of Removable Characters
1899. Merge Triplets to Form Target Triplet
1900. The Earliest and Latest Rounds Where Players Compete
1901. Find a Peak Element II
1902. Depth of BST Given Insertion Order
1903. Largest Odd Number in String
1904. The Number of Full Rounds You Have Played
1905. Count Sub Islands
1906. Minimum Absolute Difference Queries
1908. Game of Nim
1909. Remove One Element to Make the Array Strictly Increasing
1910. Remove All Occurrences of a Substring
1911. Maximum Alternating Subsequence Sum
1912. Design Movie Rental System
1913. Maximum Product Difference Between Two Pairs
1914. Cyclically Rotating a Grid
1915. Number of Wonderful Substrings
1918. Kth Smallest Subarray Sum
1920. Build Array from Permutation
1921. Eliminate Maximum Number of Monsters
1922. Count Good Numbers
1923. Longest Common Subpath
1924. Erect the Fence II
1925. Count Square Sum Triples
1926. Nearest Exit from Entrance in Maze
1927. Sum Game
1928. Minimum Cost to Reach Destination in Time
1929. Concatenation of Array
1930. Unique Length-3 Palindromic Subsequences
1931. Painting a Grid With Three Different Colors
1932. Merge BSTs to Create Single BST
1933. Check if String Is Decomposable Into Value-Equal Substrings
1935. Maximum Number of Words You Can Type
1936. Add Minimum Number of Rungs
1937. Maximum Number of Points with Cost
1938. Maximum Genetic Difference Query
1940. Longest Common Subsequence Between Sorted Arrays
1941. Check if All Characters Have Equal Number of Occurrences
1942. The Number of the Smallest Unoccupied Chair
1943. Describe the Painting
1944. Number of Visible People in a Queue
1945. Sum of Digits of String After Convert
1946. Largest Number After Mutating Substring
1947. Maximum Compatibility Score Sum
1948. Delete Duplicate Folders in System
1950. Maximum of Minimum Values in All Subarrays
1952. Three Divisors
1953. Maximum Number of Weeks for Which You Can Work
1954. Minimum Garden Perimeter to Collect Enough Apples
1955. Count Number of Special Subsequences
1956. Minimum Time For K Virus Variants to Spread
1957. Delete Characters to Make Fancy String
1958. Check if Move is Legal
1959. Minimum Total Space Wasted With K Resizing Operations
1960. Maximum Product of the Length of Two Palindromic Substrings
1961. Check If String Is a Prefix of Array
1962. Remove Stones to Minimize the Total
1963. Minimum Number of Swaps to Make the String Balanced
1964. Find the Longest Valid Obstacle Course at Each Position
1966. Binary Searchable Numbers in an Unsorted Array
1967. Number of Strings That Appear as Substrings in Word
1968. Array With Elements Not Equal to Average of Neighbors
1969. Minimum Non-Zero Product of the Array Elements
1970. Last Day Where You Can Still Cross
1971. Find if Path Exists in Graph
1973. Count Nodes Equal to Sum of Descendants
1974. Minimum Time to Type Word Using Special Typewriter
1975. Maximum Matrix Sum
1976. Number of Ways to Arrive at Destination
1977. Number of Ways to Separate Numbers
1979. Find Greatest Common Divisor of Array
1980. Find Unique Binary String
1981. Minimize the Difference Between Target and Chosen Elements
1982. Find Array Given Subset Sums
1983. Widest Pair of Indices With Equal Range Sum
1984. Minimum Difference Between Highest and Lowest of K Scores
1985. Find the Kth Largest Integer in the Array
1986. Minimum Number of Work Sessions to Finish the Tasks
1987. Number of Unique Good Subsequences
1989. Maximum Number of People That Can Be Caught in Tag
1991. Find the Middle Index in Array
1992. Find All Groups of Farmland
1993. Operations on Tree
1994. The Number of Good Subsets
1995. Count Special Quadruplets
1996. The Number of Weak Characters in the Game
1997. First Day Where You Have Been in All the Rooms
1998. GCD Sort of an Array
1999. Smallest Greater Multiple Made of Two Digits
2000. Reverse Prefix of Word
2001. Number of Pairs of Interchangeable Rectangles
2002. Maximum Product of the Length of Two Palindromic Subsequences
2003. Smallest Missing Genetic Value in Each Subtree
2005. Subtree Removal Game with Fibonacci Tree
2006. Count Number of Pairs With Absolute Difference K
2007. Find Original Array From Doubled Array
2008. Maximum Earnings From Taxi
2009. Minimum Number of Operations to Make Array Continuous
2011. Final Value of Variable After Performing Operations
2012. Sum of Beauty in the Array
2013. Detect Squares
2014. Longest Subsequence Repeated k Times
2015. Average Height of Buildings in Each Segment
2016. Maximum Difference Between Increasing Elements
2017. Grid Game
2018. Check if Word Can Be Placed In Crossword
2019. The Score of Students Solving Math Expression
2021. Brightest Position on Street
2022. Convert 1D Array Into 2D Array
2023. Number of Pairs of Strings With Concatenation Equal to Target
2024. Maximize the Confusion of an Exam
2025. Maximum Number of Ways to Partition an Array
2027. Minimum Moves to Convert String
2028. Find Missing Observations
2029. Stone Game IX
2030. Smallest K Length Subsequence With Occurrences of a Letter
2031. Count Subarrays With More Ones Than Zeros
2032. Two Out of Three
2033. Minimum Operations to Make a Uni-Value Grid
2034. Stock Price Fluctuation
2035. Partition Array Into Two Arrays to Minimize Sum Difference
2036. Maximum Alternating Subarray Sum
2037. Minimum Number of Moves to Seat Everyone
2038. Remove Colored Pieces if Both Neighbors are the Same Color
2039. The Time When the Network Becomes Idle
2040. Kth Smallest Product of Two Sorted Arrays
2042. Check if Numbers Are Ascending in a Sentence
2043. Simple Bank System
2044. Count Number of Maximum Bitwise-OR Subsets
2045. Second Minimum Time to Reach Destination
2046. Sort Linked List Already Sorted Using Absolute Values
2047. Number of Valid Words in a Sentence
2048. Next Greater Numerically Balanced Number
2049. Count Nodes With the Highest Score
2050. Parallel Courses III
2052. Minimum Cost to Separate Sentence Into Rows
2053. Kth Distinct String in an Array
2054. Two Best Non-Overlapping Events
2055. Plates Between Candles
2056. Number of Valid Move Combinations On Chessboard
2057. Smallest Index With Equal Value
2058. Find the Minimum and Maximum Number of Nodes Between Critical Points
2059. Minimum Operations to Convert Number
2060. Check if an Original String Exists Given Two Encoded Strings
2061. Number of Spaces Cleaning Robot Cleaned
2062. Count Vowel Substrings of a String
2063. Vowels of All Substrings
2064. Minimized Maximum of Products Distributed to Any Store
2065. Maximum Path Quality of a Graph
2067. Number of Equal Count Substrings
2068. Check Whether Two Strings are Almost Equivalent
2069. Walking Robot Simulation II
2070. Most Beautiful Item for Each Query
2071. Maximum Number of Tasks You Can Assign
2073. Time Needed to Buy Tickets
2074. Reverse Nodes in Even Length Groups
2075. Decode the Slanted Ciphertext
2076. Process Restricted Friend Requests
2077. Paths in Maze That Lead to Same Room
2078. Two Furthest Houses With Different Colors
2079. Watering Plants
2080. Range Frequency Queries
2081. Sum of k-Mirror Numbers
2083. Substrings That Begin and End With the Same Letter
2085. Count Common Words With One Occurrence
2086. Minimum Number of Food Buckets to Feed the Hamsters
2087. Minimum Cost Homecoming of a Robot in a Grid
2088. Count Fertile Pyramids in a Land
2089. Find Target Indices After Sorting Array
2090. K Radius Subarray Averages
2091. Removing Minimum and Maximum From Array
2092. Find All People With Secret
2093. Minimum Cost to Reach City With Discounts
2094. Finding 3-Digit Even Numbers
2095. Delete the Middle Node of a Linked List
2096. Step-By-Step Directions From a Binary Tree Node to Another
2097. Valid Arrangement of Pairs
2098. Subsequence of Size K With the Largest Even Sum
2099. Find Subsequence of Length K With the Largest Sum
2100. Find Good Days to Rob the Bank
2101. Detonate the Maximum Bombs
2102. Sequentially Ordinal Rank Tracker
2103. Rings and Rods
2104. Sum of Subarray Ranges
2105. Watering Plants II
2106. Maximum Fruits Harvested After at Most K Steps
2107. Number of Unique Flavors After Sharing K Candies
2108. Find First Palindromic String in the Array
2109. Adding Spaces to a String
2110. Number of Smooth Descent Periods of a Stock
2111. Minimum Operations to Make the Array K-Increasing
2113. Elements in Array After Removing and Replacing Elements
2114. Maximum Number of Words Found in Sentences
2115. Find All Possible Recipes from Given Supplies
2116. Check if a Parentheses String Can Be Valid
2117. Abbreviating the Product of a Range
2119. A Number After a Double Reversal
2120. Execution of All Suffix Instructions Staying in a Grid
2121. Intervals Between Identical Elements
2122. Recover the Original Array
2123. Minimum Operations to Remove Adjacent Ones in Matrix
2124. Check if All A's Appears Before All B's
2125. Number of Laser Beams in a Bank
2126. Destroying Asteroids
2127. Maximum Employees to Be Invited to a Meeting
2128. Remove All Ones With Row and Column Flips
2129. Capitalize the Title
2130. Maximum Twin Sum of a Linked List
2131. Longest Palindrome by Concatenating Two Letter Words
2132. Stamping the Grid
2133. Check if Every Row and Column Contains All Numbers
2134. Minimum Swaps to Group All 1's Together II
2135. Count Words Obtained After Adding a Letter
2136. Earliest Possible Day of Full Bloom
2137. Pour Water Between Buckets to Make Water Levels Equal
2138. Divide a String Into Groups of Size k
2139. Minimum Moves to Reach Target Score
2140. Solving Questions With Brainpower
2141. Maximum Running Time of N Computers
2143. Choose Numbers From Two Arrays in Range
2144. Minimum Cost of Buying Candies With Discount
2145. Count the Hidden Sequences
2146. K Highest Ranked Items Within a Price Range
2147. Number of Ways to Divide a Long Corridor
2148. Count Elements With Strictly Smaller and Greater Elements
2149. Rearrange Array Elements by Sign
2150. Find All Lonely Numbers in the Array
2151. Maximum Good People Based on Statements
2152. Minimum Number of Lines to Cover Points
2154. Keep Multiplying Found Values by Two
2155. All Divisions With the Highest Score of a Binary Array
2156. Find Substring With Given Hash Value
2157. Groups of Strings
2158. Amount of New Area Painted Each Day
2160. Minimum Sum of Four Digit Number After Splitting Digits
2161. Partition Array According to Given Pivot
2162. Minimum Cost to Set Cooking Time
2163. Minimum Difference in Sums After Removal of Elements
2164. Sort Even and Odd Indices Independently
2165. Smallest Value of the Rearranged Number
2166. Design Bitset
2167. Minimum Time to Remove All Cars Containing Illegal Goods
2168. Unique Substrings With Equal Digit Frequency
2169. Count Operations to Obtain Zero
2170. Minimum Operations to Make the Array Alternating
2171. Removing Minimum Number of Magic Beans
2172. Maximum AND Sum of Array
2174. Remove All Ones With Row and Column Flips II
2176. Count Equal and Divisible Pairs in an Array
2177. Find Three Consecutive Integers That Sum to a Given Number
2178. Maximum Split of Positive Even Integers
2179. Count Good Triplets in an Array
2180. Count Integers With Even Digit Sum
2181. Merge Nodes in Between Zeros
2182. Construct String With Repeat Limit
2183. Count Array Pairs Divisible by K
2184. Number of Ways to Build Sturdy Brick Wall
2185. Counting Words With a Given Prefix
2186. Minimum Number of Steps to Make Two Strings Anagram II
2187. Minimum Time to Complete Trips
2188. Minimum Time to Finish the Race
2189. Number of Ways to Build House of Cards
2190. Most Frequent Number Following Key In an Array
2191. Sort the Jumbled Numbers
2192. All Ancestors of a Node in a Directed Acyclic Graph
2193. Minimum Number of Moves to Make Palindrome
2194. Cells in a Range on an Excel Sheet
2195. Append K Integers With Minimal Sum
2196. Create Binary Tree From Descriptions
2197. Replace Non Coprime Numbers in Array
2198. Number of Single Divisor Triplets
2200. Find All K-Distant Indices in an Array
2201. Count Artifacts That Can Be Extracted
2202. Maximize the Topmost Element After K Moves
2203. Minimum Weighted Subgraph With the Required Paths
2204. Distance to a Cycle in Undirected Graph
2206. Divide Array Into Equal Pairs
2207. Maximize Number of Subsequences in a String
2208. Minimum Operations to Halve Array Sum
2209. Minimum White Tiles After Covering With Carpets
2210. Count Hills and Valleys in an Array
2211. Count Collisions on a Road
2212. Maximum Points in an Archery Competition
2213. Longest Substring of One Repeating Character
2214. Minimum Health to Beat Game
2215. Find the Difference of Two Arrays
2216. Minimum Deletions to Make Array Beautiful
2217. Find Palindrome With Fixed Length
2218. Maximum Value of K Coins From Piles
2219. Maximum Sum Score of Array
2220. Minimum Bit Flips to Convert Number
2221. Find Triangular Sum of an Array
2222. Number of Ways to Select Buildings
2223. Sum of Scores of Built Strings
2224. Minimum Number of Operations to Convert Time
2225. Find Players With Zero or One Losses
2226. Maximum Candies Allocated to K Children
2227. Encrypt and Decrypt Strings
2229. Check if an Array Is Consecutive
2231. Largest Number After Digit Swaps by Parity
2232. Minimize Result by Adding Parentheses to Expression
2233. Maximum Product After K Increments
2234. Maximum Total Beauty of the Gardens
2235. Add Two Integers
2236. Root Equals Sum of Children
2237. Count Positions on Street With Required Brightness
2239. Find Closest Number to Zero
2240. Number of Ways to Buy Pens and Pencils
2241. Design an ATM Machine
2242. Maximum Score of a Node Sequence
2243. Calculate Digit Sum of a String
2244. Minimum Rounds to Complete All Tasks
2245. Maximum Trailing Zeros in a Cornered Path
2246. Longest Path With Different Adjacent Characters
2247. Maximum Cost of Trip With K Highways
2248. Intersection of Multiple Arrays
2249. Count Lattice Points Inside a Circle
2250. Count Number of Rectangles Containing Each Point
2251. Number of Flowers in Full Bloom
2254. Design Video Sharing Platform
2255. Count Prefixes of a Given String
2256. Minimum Average Difference
2257. Count Unguarded Cells in the Grid
2258. Escape the Spreading Fire
2259. Remove Digit From Number to Maximize Result
2260. Minimum Consecutive Cards to Pick Up
2261. K Divisible Elements Subarrays
2262. Total Appeal of A String
2263. Make Array Non-decreasing or Non-increasing
2264. Largest 3-Same-Digit Number in String
2265. Count Nodes Equal to Average of Subtree
2266. Count Number of Texts
2267. Check if There Is a Valid Parentheses String Path
2268. Minimum Number of Keypresses
2269. Find the K-Beauty of a Number
2270. Number of Ways to Split Array
2271. Maximum White Tiles Covered by a Carpet
2272. Substring With Largest Variance
2273. Find Resultant Array After Removing Anagrams
2274. Maximum Consecutive Floors Without Special Floors
2275. Largest Combination With Bitwise AND Greater Than Zero
2276. Count Integers in Intervals
2277. Closest Node to Path in Tree
2278. Percentage of Letter in String
2279. Maximum Bags With Full Capacity of Rocks
2280. Minimum Lines to Represent a Line Chart
2281. Sum of Total Strength of Wizards
2282. Number of People That Can Be Seen in a Grid
2283. Check if Number Has Equal Digit Count and Digit Value
2284. Sender With Largest Word Count
2285. Maximum Total Importance of Roads
2286. Booking Concert Tickets in Groups
2287. Rearrange Characters to Make Target String
2288. Apply Discount to Prices
2289. Steps to Make Array Non-decreasing
2290. Minimum Obstacle Removal to Reach Corner
2291. Maximum Profit From Trading Stocks
2293. Min Max Game
2294. Partition Array Such That Maximum Difference Is K
2295. Replace Elements in an Array
2296. Design a Text Editor
2297. Jump Game VIII
2299. Strong Password Checker II
2300. Successful Pairs of Spells and Potions
2301. Match Substring After Replacement
2302. Count Subarrays With Score Less Than K
2303. Calculate Amount Paid in Taxes
2304. Minimum Path Cost in a Grid
2305. Fair Distribution of Cookies
2306. Naming a Company
2307. Check for Contradictions in Equations
2309. Greatest English Letter in Upper and Lower Case
2310. Sum of Numbers With Units Digit K
2311. Longest Binary Subsequence Less Than or Equal to K
2312. Selling Pieces of Wood
2313. Minimum Flips in Binary Tree to Get Result
2315. Count Asterisks
2316. Count Unreachable Pairs of Nodes in an Undirected Graph
2317. Maximum XOR After Operations
2318. Number of Distinct Roll Sequences
2319. Check if Matrix Is X-Matrix
2320. Count Number of Ways to Place Houses
2321. Maximum Score Of Spliced Array
2322. Minimum Score After Removals on a Tree
2323. Find Minimum Time to Finish All Jobs II
2325. Decode the Message
2326. Spiral Matrix IV
2327. Number of People Aware of a Secret
2328. Number of Increasing Paths in a Grid
2330. Valid Palindrome IV
2331. Evaluate Boolean Binary Tree
2332. The Latest Time to Catch a Bus
2333. Minimum Sum of Squared Difference
2334. Subarray With Elements Greater Than Varying Threshold
2335. Minimum Amount of Time to Fill Cups
2336. Smallest Number in Infinite Set
2337. Move Pieces to Obtain a String
2338. Count the Number of Ideal Arrays
2340. Minimum Adjacent Swaps to Make a Valid Array
2341. Maximum Number of Pairs in Array
2342. Max Sum of a Pair With Equal Sum of Digits
2343. Query Kth Smallest Trimmed Number
2344. Minimum Deletions to Make Array Divisible
2345. Finding the Number of Visible Mountains
2347. Best Poker Hand
2348. Number of Zero-Filled Subarrays
2349. Design a Number Container System
2350. Shortest Impossible Sequence of Rolls
2351. First Letter to Appear Twice
2352. Equal Row and Column Pairs
2353. Design a Food Rating System
2354. Number of Excellent Pairs
2355. Maximum Number of Books You Can Take
2357. Make Array Zero by Subtracting Equal Amounts
2358. Maximum Number of Groups Entering a Competition
2359. Find Closest Node to Given Two Nodes
2360. Longest Cycle in a Graph
2361. Minimum Costs Using the Train Line
2363. Merge Similar Items
2364. Count Number of Bad Pairs
2365. Task Scheduler II
2366. Minimum Replacements to Sort the Array
2367. Number of Arithmetic Triplets
2368. Reachable Nodes With Restrictions
2369. Check if There is a Valid Partition For The Array
2370. Longest Ideal Subsequence
2371. Minimize Maximum Value in a Grid
2373. Largest Local Values in a Matrix
2374. Node With Highest Edge Score
2375. Construct Smallest Number From DI String
2376. Count Special Integers
2378. Choose Edges to Maximize Score in a Tree
2379. Minimum Recolors to Get K Consecutive Black Blocks
2380. Time Needed to Rearrange a Binary String
2381. Shifting Letters II
2382. Maximum Segment Sum After Removals
2383. Minimum Hours of Training to Win a Competition
2384. Largest Palindromic Number
2385. Amount of Time for Binary Tree to Be Infected
2386. Find the K-Sum of an Array
2387. Median of a Row Wise Sorted Matrix
2389. Longest Subsequence With Limited Sum
2390. Removing Stars From a String
2391. Minimum Amount of Time to Collect Garbage
2392. Build a Matrix With Conditions
2393. Count Strictly Increasing Subarrays
2395. Find Subarrays With Equal Sum
2396. Strictly Palindromic Number
2397. Maximum Rows Covered by Columns
2398. Maximum Number of Robots Within Budget
2399. Check Distances Between Same Letters
2400. Number of Ways to Reach a Position After Exactly k Steps
2401. Longest Nice Subarray
2402. Meeting Rooms III
2403. Minimum Time to Kill All Monsters
2404. Most Frequent Even Element
2405. Optimal Partition of String
2406. Divide Intervals Into Minimum Number of Groups
2407. Longest Increasing Subsequence II
2408. Design SQL
2409. Count Days Spent Together
2410. Maximum Matching of Players With Trainers
2411. Smallest Subarrays With Maximum Bitwise OR
2412. Minimum Money Required Before Transactions
2413. Smallest Even Multiple
2414. Length of the Longest Alphabetical Continuous Substring
2415. Reverse Odd Levels of Binary Tree
2416. Sum of Prefix Scores of Strings
2417. Closest Fair Integer
2418. Sort the People
2419. Longest Subarray With Maximum Bitwise AND
2420. Find All Good Indices
2421. Number of Good Paths
2422. Merge Operations to Turn Array Into a Palindrome
2423. Remove Letter To Equalize Frequency
2424. Longest Uploaded Prefix
2425. Bitwise XOR of All Pairings
2426. Number of Pairs Satisfying Inequality
2427. Number of Common Factors
2428. Maximum Sum of an Hourglass
2429. Minimize XOR
2430. Maximum Deletions on a String
2431. Maximize Total Tastiness of Purchased Fruits
2432. The Employee That Worked on the Longest Task
2433. Find The Original Array of Prefix Xor
2434. Using a Robot to Print the Lexicographically Smallest String
2435. Paths in Matrix Whose Sum Is Divisible by K
2436. Minimum Split Into Subarrays With GCD Greater Than One
2437. Number of Valid Clock Times
2438. Range Product Queries of Powers
2439. Minimize Maximum of Array
2440. Create Components With Same Value
2441. Largest Positive Integer That Exists With Its Negative
2442. Count Number of Distinct Integers After Reverse Operations
2443. Sum of Number and Its Reverse
2444. Count Subarrays With Fixed Bounds
2445. Number of Nodes With Value One
2446. Determine if Two Events Have Conflict
2447. Number of Subarrays With GCD Equal to K
2448. Minimum Cost to Make Array Equal
2449. Minimum Number of Operations to Make Arrays Similar
2450. Number of Distinct Binary Strings After Applying Operations
2451. Odd String Difference
2452. Words Within Two Edits of Dictionary
2453. Destroy Sequential Targets
2454. Next Greater Element IV
2455. Average Value of Even Numbers That Are Divisible by Three
2456. Most Popular Video Creator
2457. Minimum Addition to Make Integer Beautiful
2458. Height of Binary Tree After Subtree Removal Queries
2459. Sort Array by Moving Items to Empty Space
2460. Apply Operations to an Array
2461. Maximum Sum of Distinct Subarrays With Length K
2462. Total Cost to Hire K Workers
2463. Minimum Total Distance Traveled
2464. Minimum Subarrays in a Valid Split
2465. Number of Distinct Averages
2466. Count Ways To Build Good Strings
2467. Most Profitable Path in a Tree
2468. Split Message Based on Limit
2469. Convert the Temperature
2470. Number of Subarrays With LCM Equal to K
2471. Minimum Number of Operations to Sort a Binary Tree by Level
2472. Maximum Number of Non-overlapping Palindrome Substrings
2473. Minimum Cost to Buy Apples
2475. Number of Unequal Triplets in Array
2476. Closest Nodes Queries in a Binary Search Tree
2477. Minimum Fuel Cost to Report to the Capital
2478. Number of Beautiful Partitions
2479. Maximum XOR of Two Non-Overlapping Subtrees
2481. Minimum Cuts to Divide a Circle
2482. Difference Between Ones and Zeros in Row and Column
2483. Minimum Penalty for a Shop
2484. Count Palindromic Subsequences
2485. Find the Pivot Integer
2486. Append Characters to String to Make Subsequence
2487. Remove Nodes From Linked List
2488. Count Subarrays With Median K
2489. Number of Substrings With Fixed Ratio
2490. Circular Sentence
2491. Divide Players Into Teams of Equal Skill
2492. Minimum Score of a Path Between Two Cities
2493. Divide Nodes Into the Maximum Number of Groups
2495. Number of Subarrays Having Even Product
2496. Maximum Value of a String in an Array
2497. Maximum Star Sum of a Graph
2498. Frog Jump II
2499. Minimum Total Cost to Make Arrays Unequal
2500. Delete Greatest Value in Each Row
2501. Longest Square Streak in an Array
2502. Design Memory Allocator
2503. Maximum Number of Points From Grid Queries
2505. Bitwise OR of All Subsequence Sums
2506. Count Pairs Of Similar Strings
2507. Smallest Value After Replacing With Sum of Prime Factors
2508. Add Edges to Make Degrees of All Nodes Even
2509. Cycle Length Queries in a Tree
2510. Check if There is a Path With Equal Number of 0's And 1's
2511. Maximum Enemy Forts That Can Be Captured
2512. Reward Top K Students
2513. Minimize the Maximum of Two Arrays
2514. Count Anagrams
2515. Shortest Distance to Target String in a Circular Array
2516. Take K of Each Character From Left and Right
2517. Maximum Tastiness of Candy Basket
2518. Number of Great Partitions
2519. Count the Number of K-Big Indices
2520. Count the Digits That Divide a Number
2521. Distinct Prime Factors of Product of Array
2522. Partition String Into Substrings With Values at Most K
2523. Closest Prime Numbers in Range
2524. Maximum Frequency Score of a Subarray
2525. Categorize Box According to Criteria
2526. Find Consecutive Integers from a Data Stream
2527. Find Xor-Beauty of Array
2528. Maximize the Minimum Powered City
2529. Maximum Count of Positive Integer and Negative Integer
2530. Maximal Score After Applying K Operations
2531. Make Number of Distinct Characters Equal
2532. Time to Cross a Bridge
2533. Number of Good Binary Strings
2534. Time Taken to Cross the Door
2535. Difference Between Element Sum and Digit Sum of an Array
2536. Increment Submatrices by One
2537. Count the Number of Good Subarrays
2538. Difference Between Maximum and Minimum Price Sum
2539. Count the Number of Good Subsequences
2540. Minimum Common Value
2541. Minimum Operations to Make Array Equal II
2542. Maximum Subsequence Score
2543. Check if Point Is Reachable
2544. Alternating Digit Sum
2545. Sort the Students by Their Kth Score
2546. Apply Bitwise Operations to Make Strings Equal
2547. Minimum Cost to Split an Array
2548. Maximum Price to Fill a Bag
2549. Count Distinct Numbers on Board
2550. Count Collisions of Monkeys on a Polygon
2551. Put Marbles in Bags
2552. Count Increasing Quadruplets
2553. Separate the Digits in an Array
2554. Maximum Number of Integers to Choose From a Range I
2555. Maximize Win From Two Segments
2556. Disconnect Path in a Binary Matrix by at Most One Flip
2557. Maximum Number of Integers to Choose From a Range II
2558. Take Gifts From the Richest Pile
2559. Count Vowel Strings in Ranges
2560. House Robber IV
2561. Rearranging Fruits
2562. Find the Array Concatenation Value
2563. Count the Number of Fair Pairs
2564. Substring XOR Queries
2565. Subsequence With the Minimum Score
2566. Maximum Difference by Remapping a Digit
2567. Minimum Score by Changing Two Elements
2568. Minimum Impossible OR
2569. Handling Sum Queries After Update
2570. Merge Two 2D Arrays by Summing Values
2571. Minimum Operations to Reduce an Integer to 0
2572. Count the Number of Square-Free Subsets
2573. Find the String with LCP
2574. Left and Right Sum Differences
2575. Find the Divisibility Array of a String
2576. Find the Maximum Number of Marked Indices
2577. Minimum Time to Visit a Cell In a Grid
2578. Split With Minimum Sum
2579. Count Total Number of Colored Cells
2580. Count Ways to Group Overlapping Ranges
2581. Count Number of Possible Root Nodes
2582. Pass the Pillow
2583. Kth Largest Sum in a Binary Tree
2584. Split the Array to Make Coprime Products
2585. Number of Ways to Earn Points
2586. Count the Number of Vowel Strings in Range
2587. Rearrange Array to Maximize Prefix Score
2588. Count the Number of Beautiful Subarrays
2589. Minimum Time to Complete All Tasks
2590. Design a Todo List
2591. Distribute Money to Maximum Children
2592. Maximize Greatness of an Array
2593. Find Score of an Array After Marking All Elements
2594. Minimum Time to Repair Cars
2595. Number of Even and Odd Bits
2596. Check Knight Tour Configuration
2597. The Number of Beautiful Subsets
2598. Smallest Missing Non-negative Integer After Operations
2599. Make the Prefix Sum Non-negative
2600. K Items With the Maximum Sum
2601. Prime Subtraction Operation
2602. Minimum Operations to Make All Array Elements Equal
2603. Collect Coins in a Tree
2604. Minimum Time to Eat All Grains
2605. Form Smallest Number From Two Digit Arrays
2606. Find the Substring With Maximum Cost
2607. Make K-Subarray Sums Equal
2608. Shortest Cycle in a Graph
2609. Find the Longest Balanced Substring of a Binary String
2610. Convert an Array Into a 2D Array With Conditions
2611. Mice and Cheese
2612. Minimum Reverse Operations
2613. Beautiful Pairs
2614. Prime In Diagonal
2615. Sum of Distances
2616. Minimize the Maximum Difference of Pairs
2617. Minimum Number of Visited Cells in a Grid
2618. Check if Object Instance of Class
2619. Array Prototype Last
2620. Counter
2621. Sleep
2622. Cache With Time Limit
2623. Memoize
2624. Snail Traversal
2625. Flatten Deeply Nested Array
2626. Array Reduce Transformation
2627. Debounce
2628. JSON Deep Equal
2629. Function Composition
2630. Memoize II
2631. Group By
2632. Curry
2633. Convert Object to JSON String
2634. Filter Elements from Array
2635. Apply Transform Over Each Element in Array
2636. Promise Pool
2637. Promise Time Limit
2638. Count the Number of K-Free Subsets
2639. Find the Width of Columns of a Grid
2640. Find the Score of All Prefixes of an Array
2641. Cousins in Binary Tree II
2642. Design Graph With Shortest Path Calculator
2643. Row With Maximum Ones
2644. Find the Maximum Divisibility Score
2645. Minimum Additions to Make Valid String
2646. Minimize the Total Price of the Trips
2647. Color the Triangle Red
2648. Generate Fibonacci Sequence
2649. Nested Array Generator
2650. Design Cancellable Function
2651. Calculate Delayed Arrival Time
2652. Sum Multiples
2653. Sliding Subarray Beauty
2654. Minimum Number of Operations to Make All Array Elements Equal to 1
2655. Find Maximal Uncovered Ranges
2656. Maximum Sum With Exactly K Elements
2657. Find the Prefix Common Array of Two Arrays
2658. Maximum Number of Fish in a Grid
2659. Make Array Empty
2660. Determine the Winner of a Bowling Game
2661. First Completely Painted Row or Column
2662. Minimum Cost of a Path With Special Roads
2663. Lexicographically Smallest Beautiful String
2664. The Knight’s Tour
2665. Counter II
2666. Allow One Function Call
2667. Create Hello World Function
2670. Find the Distinct Difference Array
2671. Frequency Tracker
2672. Number of Adjacent Elements With the Same Color
2673. Make Costs of Paths Equal in a Binary Tree
2674. Split a Circular Linked List
2675. Array of Objects to Matrix
2676. Throttle
2677. Chunk Array
2678. Number of Senior Citizens
2679. Sum in a Matrix
2680. Maximum OR
2681. Power of Heroes
2682. Find the Losers of the Circular Game
2683. Neighboring Bitwise XOR
2684. Maximum Number of Moves in a Grid
2685. Count the Number of Complete Components
2689. Extract Kth Character From The Rope Tree
2690. Infinite Method Object
2692. Make Object Immutable
2693. Call Function with Custom Context
2694. Event Emitter
2695. Array Wrapper
2696. Minimum String Length After Removing Substrings
2697. Lexicographically Smallest Palindrome
2698. Find the Punishment Number of an Integer
2699. Modify Graph Edge Weights
2700. Differences Between Two Objects
2702. Minimum Operations to Make Numbers Non-positive
2703. Return Length of Arguments Passed
2704. To Be Or Not To Be
2705. Compact Object
2706. Buy Two Chocolates
2707. Extra Characters in a String
2708. Maximum Strength of a Group
2709. Greatest Common Divisor Traversal
2710. Remove Trailing Zeros From a String
2711. Difference of Number of Distinct Values on Diagonals
2712. Minimum Cost to Make All Characters Equal
2713. Maximum Strictly Increasing Cells in a Matrix
2714. Find Shortest Path with K Hops
2715. Timeout Cancellation
2716. Minimize String Length
2717. Semi-Ordered Permutation
2718. Sum of Matrix After Queries
2719. Count of Integers
2721. Execute Asynchronous Functions in Parallel
2722. Join Two Arrays by ID
2723. Add Two Promises
2724. Sort By
2725. Interval Cancellation
2726. Calculator with Method Chaining
2727. Is Object Empty
2728. Count Houses in a Circular Street
2729. Check if The Number is Fascinating
2730. Find the Longest Semi-Repetitive Substring
2731. Movement of Robots
2732. Find a Good Subset of the Matrix
2733. Neither Minimum nor Maximum
2734. Lexicographically Smallest String After Substring Operation
2735. Collecting Chocolates
2736. Maximum Sum Queries
2737. Find the Closest Marked Node
2739. Total Distance Traveled
2740. Find the Value of the Partition
2741. Special Permutations
2742. Painting the Walls
2743. Count Substrings Without Repeating Character
2744. Find Maximum Number of String Pairs
2745. Construct the Longest New String
2746. Decremental String Concatenation
2747. Count Zero Request Servers
2748. Number of Beautiful Pairs
2749. Minimum Operations to Make the Integer Zero
2750. Ways to Split Array Into Good Subarrays
2753. Count Houses in a Circular Street II
2754. Bind Function to Context
2755. Deep Merge of Two Objects
2757. Generate Circular Array Values
2758. Next Day
2759. Convert JSON String to Object
2760. Longest Even Odd Subarray With Threshold
2761. Prime Pairs With Target Sum
2762. Continuous Subarrays
2763. Sum of Imbalance Numbers of All Subarrays
2764. is Array a Preorder of Some ‌Binary Tree
2765. Longest Alternating Subarray
2766. Relocate Marbles
2767. Partition String Into Minimum Beautiful Substrings
2768. Number of Black Blocks
2769. Find the Maximum Achievable Number
2770. Maximum Number of Jumps to Reach the Last Index
2771. Longest Non-decreasing Subarray From Two Arrays
2772. Apply Operations to Make All Array Elements Equal to Zero
2773. Height of Special Binary Tree
2774. Array Upper Bound
2775. Undefined to Null
2776. Convert Callback Based Function to Promise Based Function
2777. Date Range Generator
2778. Sum of Squares of Special Elements
2779. Maximum Beauty of an Array After Applying Operation
2780. Minimum Index of a Valid Split
2781. Length of the Longest Valid Substring
2782. Number of Unique Categories
2784. Check if Array is Good
2785. Sort Vowels in a String
2786. Visit Array Positions to Maximize Score
2787. Ways to Express an Integer as Sum of Powers
2788. Split Strings by Separator
2789. Largest Element in an Array after Merge Operations
2790. Maximum Number of Groups With Increasing Length
2791. Count Paths That Can Form a Palindrome in a Tree
2792. Count Nodes That Are Great Enough
2794. Create Object from Two Arrays
2795. Parallel Execution of Promises for Individual Results Retrieval
2796. Repeat String
2797. Partial Function with Placeholders
2798. Number of Employees Who Met the Target
2799. Count Complete Subarrays in an Array
2800. Shortest String That Contains Three Strings
2801. Count Stepping Numbers in Range
2802. Find The K-th Lucky Number
2803. Factorial Generator
2804. Array Prototype ForEach
2805. Custom Interval
2806. Account Balance After Rounded Purchase
2807. Insert Greatest Common Divisors in Linked List
2808. Minimum Seconds to Equalize a Circular Array
2809. Minimum Time to Make Array Sum At Most x
2810. Faulty Keyboard
2811. Check if it is Possible to Split Array
2812. Find the Safest Path in a Grid
2813. Maximum Elegance of a K-Length Subsequence
2814. Minimum Time Takes to Reach Destination Without Drowning
2815. Max Pair Sum in an Array
2816. Double a Number Represented as a Linked List
2817. Minimum Absolute Difference Between Elements With Constraint
2818. Apply Operations to Maximize Score
2819. Minimum Relative Loss After Buying Chocolates
2821. Delay the Resolution of Each Promise
2822. Inversion of Object
2823. Deep Object Filter
2824. Count Pairs Whose Sum is Less than Target
2825. Make String a Subsequence Using Cyclic Increments
2826. Sorting Three Groups
2827. Number of Beautiful Integers in the Range
2828. Check if a String Is an Acronym of Words
2829. Determine the Minimum Sum of a k-avoiding Array
2830. Maximize the Profit as the Salesman
2831. Find the Longest Equal Subarray
2832. Maximal Range That Each Element Is Maximum in It
2833. Furthest Point From Origin
2834. Find the Minimum Possible Sum of a Beautiful Array
2835. Minimum Operations to Form Subsequence With Target Sum
2836. Maximize Value of Function in a Ball Passing Game
2838. Maximum Coins Heroes Can Collect
2839. Check if Strings Can be Made Equal With Operations I
2840. Check if Strings Can be Made Equal With Operations II
2841. Maximum Sum of Almost Unique Subarray
2842. Count K-Subsequences of a String With Maximum Beauty
2843. Count Symmetric Integers
2844. Minimum Operations to Make a Special Number
2845. Count of Interesting Subarrays
2846. Minimum Edge Weight Equilibrium Queries in a Tree
2847. Smallest Number With Given Digit Product
2848. Points That Intersect With Cars
2849. Determine if a Cell Is Reachable at a Given Time
2850. Minimum Moves to Spread Stones Over Grid
2851. String Transformation
2852. Sum of Remoteness of All Cells
2855. Minimum Right Shifts to Sort the Array
2856. Minimum Array Length After Pair Removals
2857. Count Pairs of Points With Distance k
2858. Minimum Edge Reversals So Every Node Is Reachable
2859. Sum of Values at Indices With K Set Bits
2860. Happy Students
2861. Maximum Number of Alloys
2862. Maximum Element-Sum of a Complete Subset of Indices
2863. Maximum Length of Semi-Decreasing Subarrays
2864. Maximum Odd Binary Number
2865. Beautiful Towers I
2866. Beautiful Towers II
2867. Count Valid Paths in a Tree
2868. The Wording Game
2869. Minimum Operations to Collect Elements
2870. Minimum Number of Operations to Make Array Empty
2871. Split Array Into Maximum Number of Subarrays
2872. Maximum Number of K-Divisible Components
2873. Maximum Value of an Ordered Triplet I
2874. Maximum Value of an Ordered Triplet II
2875. Minimum Size Subarray in Infinite Array
2876. Count Visited Nodes in a Directed Graph
2877. Create a DataFrame from List
2878. Get the Size of a DataFrame
2879. Display the First Three Rows
2880. Select Data
2881. Create a New Column
2882. Drop Duplicate Rows
2883. Drop Missing Data
2884. Modify Columns
2885. Rename Columns
2886. Change Data Type
2887. Fill Missing Data
2888. Reshape Data Concatenate
2889. Reshape Data Pivot
2890. Reshape Data Melt
2891. Method Chaining
2892. Minimizing Array After Replacing Pairs With Their Product
2894. Divisible and Non-divisible Sums Difference
2895. Minimum Processing Time
2896. Apply Operations to Make Two Strings Equal
2897. Apply Operations on Array to Maximize Sum of Squares
2898. Maximum Linear Stock Score
2899. Last Visited Integers
2900. Longest Unequal Adjacent Groups Subsequence I
2901. Longest Unequal Adjacent Groups Subsequence II
2902. Count of Sub-Multisets With Bounded Sum
2903. Find Indices With Index and Value Difference I
2904. Shortest and Lexicographically Smallest Beautiful String
2905. Find Indices With Index and Value Difference II
2906. Construct Product Matrix
2907. Maximum Profitable Triplets With Increasing Prices I
2908. Minimum Sum of Mountain Triplets I
2909. Minimum Sum of Mountain Triplets II
2910. Minimum Number of Groups to Create a Valid Assignment
2911. Minimum Changes to Make K Semi-palindromes
2912. Number of Ways to Reach Destination in the Grid
2913. Subarrays Distinct Element Sum of Squares I
2914. Minimum Number of Changes to Make Binary String Beautiful
2917. Find the K-or of an Array
2918. Minimum Equal Sum of Two Arrays After Replacing Zeros
2919. Minimum Increment Operations to Make Array Beautiful
2920. Maximum Points After Collecting Coins From All Nodes
2921. Maximum Profitable Triplets With Increasing Prices II
2923. Find Champion I
2924. Find Champion II
2925. Maximum Score After Applying Operations on a Tree
2926. Maximum Balanced Subsequence Sum
2927. Distribute Candies Among Children III
2928. Distribute Candies Among Children I
2929. Distribute Candies Among Children II
2930. Number of Strings Which Can Be Rearranged to Contain Substring
2931. Maximum Spending After Buying Items
2932. Maximum Strong Pair XOR I
2933. High-Access Employees
2934. Minimum Operations to Maximize Last Elements in Arrays
2935. Maximum Strong Pair XOR II
2936. Number of Equal Numbers Blocks
2937. Make Three Strings Equal
2938. Separate Black and White Balls
2939. Maximum Xor Product
2940. Find Building Where Alice and Bob Can Meet
2941. Maximum GCD-Sum of a Subarray
2942. Find Words Containing Character
2943. Maximize Area of Square Hole in Grid
2944. Minimum Number of Coins for Fruits
2945. Find Maximum Non-decreasing Array Length
2946. Matrix Similarity After Cyclic Shifts
2947. Count Beautiful Substrings I
2948. Make Lexicographically Smallest Array by Swapping Elements
2950. Number of Divisible Substrings
2951. Find the Peaks
2952. Minimum Number of Coins to be Added
2953. Count Complete Substrings
2954. Count the Number of Infection Sequences
2955. Number of Same-End Substrings
2956. Find Common Elements Between Two Arrays
2957. Remove Adjacent Almost-Equal Characters
2958. Length of Longest Subarray With at Most K Frequency
2959. Number of Possible Sets of Closing Branches
2960. Count Tested Devices After Test Operations
2961. Double Modular Exponentiation
2962. Count Subarrays Where Max Element Appears at Least K Times
2963. Count the Number of Good Partitions
2964. Number of Divisible Triplet Sums
2965. Find Missing and Repeated Values
2966. Divide Array Into Arrays With Max Difference
2967. Minimum Cost to Make Array Equalindromic
2968. Apply Operations to Maximize Frequency Score
2969. Minimum Number of Coins for Fruits II
2970. Count the Number of Incremovable Subarrays I
2971. Find Polygon With the Largest Perimeter
2972. Count the Number of Incremovable Subarrays II
2973. Find Number of Coins to Place in Tree Nodes
2974. Minimum Number Game
2975. Maximum Square Area by Removing Fences From a Field
2976. Minimum Cost to Convert String I
2977. Minimum Cost to Convert String II
2979. Most Expensive Item That Can Not Be Bought
2980. Check if Bitwise OR Has Trailing Zeros
2981. Find Longest Special Substring That Occurs Thrice I
2982. Find Longest Special Substring That Occurs Thrice II
2983. Palindrome Rearrangement Queries
2992. Number of Self-Divisible Permutations
2996. Smallest Missing Integer Greater Than Sequential Prefix Sum
2997. Minimum Number of Operations to Make Array XOR Equal to K
2998. Minimum Number of Operations to Make X and Y Equal
2999. Count the Number of Powerful Integers
3000. Maximum Area of Longest Diagonal Rectangle
3001. Minimum Moves to Capture The Queen
3002. Maximum Size of a Set After Removals
3003. Maximize the Number of Partitions After Operations
3004. Maximum Subtree of the Same Color
3005. Count Elements With Maximum Frequency
3006. Find Beautiful Indices in the Given Array I
3007. Maximum Number That Sum of the Prices Is Less Than or Equal to K
3008. Find Beautiful Indices in the Given Array II
3009. Maximum Number of Intersections on the Chart
3010. Divide an Array Into Subarrays With Minimum Cost I
3011. Find if Array Can Be Sorted
3012. Minimize Length of Array Using Operations
3013. Divide an Array Into Subarrays With Minimum Cost II
3014. Minimum Number of Pushes to Type Word I
3015. Count the Number of Houses at a Certain Distance I
3016. Minimum Number of Pushes to Type Word II
3017. Count the Number of Houses at a Certain Distance II
3018. Maximum Number of Removal Queries That Can Be Processed I
3019. Number of Changing Keys
3020. Find the Maximum Number of Elements in Subset
3021. Alice and Bob Playing Flower Game
3022. Minimize OR of Remaining Elements Using Operations
3023. Find Pattern in Infinite Stream I
3024. Type of Triangle
3025. Find the Number of Ways to Place People I
3026. Maximum Good Subarray Sum
3027. Find the Number of Ways to Place People II
3028. Ant on the Boundary
3029. Minimum Time to Revert Word to Initial State I
3030. Find the Grid of Region Average
3031. Minimum Time to Revert Word to Initial State II
3032. Count Numbers With Unique Digits II
3033. Modify the Matrix
3034. Number of Subarrays That Match a Pattern I
3035. Maximum Palindromes After Operations
3036. Number of Subarrays That Match a Pattern II
3038. Maximum Number of Operations With the Same Score I
3039. Apply Operations to Make String Empty
3040. Maximum Number of Operations With the Same Score II
3042. Count Prefix and Suffix Pairs I
3043. Find the Length of the Longest Common Prefix
3044. Most Frequent Prime
3045. Count Prefix and Suffix Pairs II
3046. Split the Array
3047. Find the Largest Area of Square Inside Two Rectangles
3048. Earliest Second to Mark Indices I
3062. Winner of the Linked List Game
3063. Linked List Frequency
3064. Guess the Number Using Bitwise Questions I
3065. Minimum Operations to Exceed Threshold Value I
3066. Minimum Operations to Exceed Threshold Value II
3067. Count Pairs of Connectable Servers in a Weighted Tree Network
3069. Distribute Elements Into Two Arrays I
3070. Count Submatrices with Top-Left Element and Sum Less Than k
3071. Minimum Operations to Write the Letter Y on a Grid
3072. Distribute Elements Into Two Arrays II
3073. Maximum Increasing Triplet Value
3074. Apple Redistribution into Boxes
3075. Maximize Happiness of Selected Children
3076. Shortest Uncommon Substring in an Array
3077. Maximum Strength of K Disjoint Subarrays
3078. Match Alphanumerical Pattern in Matrix I

Breadth First Search
BFS on Tree
Binary Tree Min Depth

Binary Tree Min Depth

Prereq: BFS on Tree

Given a binary tree, find the depth of the shallowest leaf node.

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