leetcode 344. Reverse String

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于 2017-10-24 08:56:01 发布

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344. Reverse String

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

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

class Solution {
public:
    string reverseString(string s) {
        int n=s.size();
        int i=0;
        int j=n-1;
        while(i<=j) {
            if (s[i] != s[j])
                swap(s[i], s[j]);
            i++;
            j--;
        }
        return s;
    }
};