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344.Reverse String

Tags: Easy String Two Pointers

Links: https://leetcode.com/problems/reverse-string/


Write a function that reverses a string. The input string is given as an array of characters char[].

Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

You may assume all the characters consist of printable ascii characters.

Example 1:

Input: ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]

Example 2:

Input: ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]

class Solution {
public:
    void reverseString(vector<char>& s) {
        int n = s.size();
        int left = 0, right = n - 1;
        while (left <= right) {
            std::swap(s[left++], s[right--]);
        }
    }
};