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

		return s;
	}
}