LeetCode----344. Reverse String 字符串反转

344. Reverse String

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

Example:

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

设两个指针，分别指向字符串的首和尾，同时向中间移动，移动次数为字符串长度的1/2.

class Solution {
public:
string reverseString(string s) {
if(s.size()==0||s.size()==1){
return s;
}
char *f,*l;
f=&s[0];
l=&s[s.size()-1];
for(int i=0;i<s.size()/2;i++){
char tmp=*f;
*f++=*l;
*l--=tmp;
}
return s;
}
};