[LeetCode] 344. Reverse String

처음 돌렸을때는 16ms나왔는데 계속 돌릴수록 다른 Discuss 답안이랑 비슷한 28-32ms 나온다.

간단한 구조여서 어떻게 짜든 다 비슷하게 나오는듯.

내가 짠 코드

class Solution {
public:
    void reverseString(vector<char>& s) {
        char tmp;
        for(int i=0;i<s.size()/2;i++){
            tmp = s[i];
            s[i] = s[s.size()-1-i];
            s[s.size()-1-i] = tmp;
        }
    }
};

Success

Details 

Runtime: 16 ms, faster than 98.56% of C++ online submissions for Reverse String.

Memory Usage: 23.1 MB, less than 91.72% of C++ online submissions for Reverse String.

Discuss 코드 1

class Solution {
public:
    void reverseString(vector<char>& s) {
        int i = 0, j = s.size() - 1;
        while(i < j){
            swap(s[i++], s[j--]); 
        }
    }
};

Success

Details 

Runtime: 32 ms, faster than 62.28% of C++ online submissions for Reverse String.

Memory Usage: 23.3 MB, less than 80.83% of C++ online submissions for Reverse String.

Discuss 코드 2

class Solution {
public:
    void reverseString(vector<char>& s) {
       reverse(s.begin() , s.end() ); 
    }
};

Success

Details 

Runtime: 28 ms, faster than 77.16% of C++ online submissions for Reverse String.

Memory Usage: 23.2 MB, less than 91.72% of C++ online submissions for Reverse String.

 

leetcode.com/problems/reverse-string/

Reverse String - LeetCode