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

Example:
Given s = “hello”, return “olleh”.

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简单的字节倒转，怎么做都行。。我用栈


class Solution {
public:
string reverseString(string s) {
stack sum;
for(int i = 0;i< s.length();i++) { sum.push(s[i]); } string temp; for(int i = 0;i < s.length();i++) { temp = temp + sum.top(); sum.pop(); } return temp; } };