leetcode 344

ResverString

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

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

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C++

1、STL

class Solution {
public:
    string reverseString(string s) {
        reverse(s.begin(),s.end());
        return s;
        
    }
};

2、swap in-place

class Solution {
public:
    string reverseString(string s) {
        auto i=0;
        auto j=s.size();
        if(j==0)
            return s;
        else
            j--;
        while(i<j){
            swap(s[i++],s[j--]);
        }
        return s;
    }
};