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;

    }

};