344. Reverse String

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"]

public void ReverseString(char[] s)
        {
            int i = 0;
            int j = s.Length - 1;
            while (i < j)
            {
                var temp = s[i];
                s[i] = s[j];
                s[j] = temp;
                i++;
                j--;
            }
        }

 

作者:Chuck Lu    GitHub