Web Reference: Mar 7, 2026 · Start from both ends of the string and keep swapping characters while moving toward the center. Each swap places the correct character in its reversed position, and when both pointers meet in the middle, the entire string becomes reversed. We define a function that reverses a segment of the array defined by left and right indices. The base case for the recursion is when the left pointer has met or surpassed the right pointer. This indicates that the segment is either empty or contains a single character, which doesn't need reversal. Understanding the Problem We're given an array of characters and need to reverse it in place. "In place" means we can't create a new array and copy the reversed characters into it. We need to rearrange the existing array using only O (1) extra memory.
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