再战leetcode

反转字符串 题目描述

题解

这题很简单，直接看代码。

class Solution {
    public void reverseString(char[] s) {
        int left = 0, right = s.length - 1;
        while (left < right) {
            swap(s, left, right);
            left++;
            right--;
        }
    }

    public void swap(char[] s, int i, int j) {
        char ch = s[i];
        s[i] = s[j];
        s[j] = ch;
    }
}