344.txt

// reverse 函数


class Solution {
public:
    void reverseString(vector<char>& s) {
        
        reverse(s.begin(),s.end());
        
    }
};

//swap 
class Solution {
public:
    void reverseString(vector<char>& s) {
        int mid = s.size()/2;
        for(int i = 0; i < mid ; i++){
            
            swap(s[i],s[s.size()-i-1]);
            
            
            
            
            
            
        }
        
      
        
    }
};