The Solution to Leetcode 344 Reverse String

Question:

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

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

思路：将字符串首末字符调换，第二个字符与倒数第二个字符调换，以此类推。

Answer:

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

run code results:

Your input

"hello"

Your answer

"olleh"

Expected answer

"olleh"