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//Runtime: 56 ms, faster than 98.42%
//Memory Usage: 17.9 MB, less than 44.07%
class Solution {
public:
    void reverseString(vector<char>& s) {
        char temp;
        for(int i = 0; i< s.size() / 2;++i){
            temp = s[i];
            s[i] = s[s.size() - 1 - i];
            s[s.size() - 1 -i] = temp;
        }
    }
};