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++：

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('');
};

分类: Leetcode