344. Reverse String (Easy)

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"]

Hints

Solutions

  • Java
class Solution {
    public void reverseString(char[] s) {
        if (s == null || s.length <= 1) return;

        for (int i = 0; i < s.length; i++) {
            if (i >= s.length - i - 1) break;

            char tmp = s[i];
            s[i] = s[s.length-i-1];
            s[s.length-i-1] = tmp;
        }
    }
}
Copyright © iovi.com 2017 all right reserved,powered by GitbookLast Modification: 2019-04-04 12:19:13

results matching ""

    No results matching ""