反转字符串 Reverse String

题目

翻转字符串

以下为详细说明:

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"]

思路&题解

public void reverseString(char[] s) {
    if(s.length<=1){
        return;
    }
    int mid = s.length/2;
    int maxIndex = s.length-1;
    for(int i = 0; i<mid;i++){
        char tmp = s[i];
        s[i] = s[maxIndex-i];
        s[maxIndex-i] = tmp;
    }
}

知识点分析

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