Leetcode 344. Reverse String

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

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

解法一：直接用reverse函数

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

}
};

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