Blind 75 is the go-to list for interview prep, but most platforms make you tackle it alone. On AlgoMonster, each problem is backed by the core patterns you've already learned, so you're not just guessing — you're applying real techniques. And if you mess up, we'll tell you exactly where you went wrong and how to fix it. It's the Blind 75, but finally with actual support.
Rewards clever set usage over sorting.
Introduces hash-map pair lookup.
This problem tests understanding of mathematical properties, bit manipulation, and the ability to find missing elements in a sequence.
This problem tests understanding of string manipulation, encoding/decoding techniques, and the ability to design algorithms for data serialization.
This problem tests understanding of matrix manipulation, in-place operations, and geometric transformations.
Covers hash-map grouping by a canonical key.
This problem tests understanding of matrix traversal, boundary conditions, and direction changes. It's a common interview question that requires careful handling of edge cases.
This problem tests understanding of matrix manipulation, in-place algorithms, and space optimization. It's a common interview question that requires careful handling of edge cases and space constraints.
Introduces hash-set membership checks.
Covers frequency counting with ranked selection.
Introduces prefix and suffix multiplication techniques for in-place computations.
Teaches single-pass running-minimum scanning.
Two pointers with a non-obvious pruning argument.
Extends two-pointer search after sorting.
Introduces the use of slow-fast pointers, reversing a linked list, and merging two lists.
Introduces two-pointer iteration.
Introduces the sliding window pattern.
Extends sliding window with a replacement budget.
Hardens sliding-window with shrink conditions.
Introduces stack-based LIFO matching.