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Reverse String

Tags : pointers, leetcode, cpp, easy

Problem Statement - link #

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

Examples #

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"]

Constraints #

Solutions #

class Solution {
public:
    void reverseString(vector<char>& s) {
       // reverse(s.begin(),s.end());
        int l=0,r=s.size()-1;
        for(;l<r;){
            int t = s[l];
            s[l] = s[r];
            s[r] = t;
            l++;
            r--;
        }
    }
};