Perfect Squares 2
Prereq: Knapsack Intro
This problem is similar to Perfect Squares, except a number can only be used once.
Again we ask you to output the minimum number of numbers in order to sum to the desired number.
Output -1 if the number can't be reached.
Examples
Example 1:
Input: 12
Output: -1
Explanation:
You cannot make 12 with any combination of 1, 4, 9
Example 2:
Input: 13
Output: 2
Explanation:
13 = 4 + 9
Try it yourself
Solution
Title
Script
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>>> a = [1, 2, 3]
>>> a[-1]
3