Find duplicate number in array with 1 to N+1 numbers with one number repeating

Finding the Critical Point in a Mountain or Valley-Shaped Array

Find the smallest subarray with a sum greater than a given integer

Rearrange array to alternate positive and negative elements

Subarray sum equals K - Return any subarray

Two Sum

Product of Array Except Self

Remove duplicates from Sorted Array 2

3Sum - Closest

Summary Ranges

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