344. Reverse String

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# 題目敘述

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"]

# 解題思路

# Solution

class Solution {

    public void reverseString(char[] s) {

        int i = 0, j = s.length - 1;

        while(i < j) {

            char temp = s[i];

            s[i++] = s[j];

            s[j--] = temp;

        }

    }

}