Reverse String

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++：

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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：

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

方法二：

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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：

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

　　

　　

 

 

 

分类: Leetcode