Leetcode 344. Reverse String

题目网址：https://leetcode.com/problems/reverse-string/

Write a function that takes a string as input and returns the string reversed.

Example:

Given s = "hello", return "olleh".

 

解法：

C++：

class Solution {
public:
    string reverseString(string s) {
        int len = s.length();
        char result = '';
        int j = 0;
        for(int i = len-1;i>=0;i--) {
            result[j] = s[i];
            j++;
        }
        return result;
    }
};

Python：

方法一：

class Solution(object):
    def reverseString(self, s):
        """
        :type s: str
        :rtype: str
        """
        return s[::-1]

方法二：

class Solution(object):
    def reverseString(self, s):
        """
        :type s: str
        :rtype: str
        """
        t = list(s)
        l = len(t)
        for i,j in zip(range(l-1, 0, -1), range(l//2)):
            t[i], t[j] = t[j], t[i]
        return "".join(t)

　　

Javascript：

/**
 * @param {string} s
 * @return {string}
 */
var reverseString = function(s) {
    return s.split('').reverse().join('');
};