leetcode 344.反转字符串

class Solution {
public:
    void reverseString(vector<char>& s) {
        
        int len=s.size();
        if(len==0){
            return;
        }
        int i=0;
        int j=len-1;
        while(i<j){
            char temp=s[i];
            s[i]=s[j];
            s[j]=temp;
            i++;
            j--;
        }
        
    }
};