Web Reference: The entire logic for reversing a string is based on using the opposite directional two-pointer approach! 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. Write a function that reverses a string. The input string is given as an array of characters s. You must do this by modifying the input array in-place with O(1) extra memory. s[i] is a printable ascii character. The entire logic for reversing a string is based on using the opposite directional two-pointer approach! Webmaster (Zhang Jian): 👋.
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