Leetcode 344 - Reverse String
Problem Link
Problem Description 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.
Example 1:
Input: s = [“h”,“e”,“l”,“l”,“o”] Output: [“o”,“l”,“l”,“e”,“h”] Example 2:
Input: s = [“H”,“a”,“n”,“n”,“a”,“h”] Output: [“h”,“a”,“n”,“n”,“a”,“H”]
Approach Opposite Direction Pointers: One pointer starts at the beginning, and the other starts at the end.
Both pointers move inward simultaneously with the same step size until they cross each other (left > right), at which point the traversal ends.
