344. Reverse String

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

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

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临时对象

class Solution {public:    string reverseString(string s) {        int length=s.size();        string str_tmp(length,0);        int j=0;        for(int i=s.size()-1;i>=0;i--)        {            str_tmp[j++]=s[i];        }                return str_tmp;    }};

原址交换

class Solution {public:    string reverseString(string s) {        int j=s.size()-1;        for(int i=0;i<j;i++,j--)        {            swap(s[i],s[j]);        }                return s;    }};

牛逼的C++

class Solution {public:    string reverseString(string s) {       return string(s.rbegin(), s.rend());    }};