[1924번] In 2007 2007년 - For Loop [C++] ☆

https://www.acmicpc.net/problem/1924

#include <iostream>
#include <stdio.h>
#include <string>
#pragma warning(disable : 4996)
using namespace std;
 
int main() {
    //2007.1.1 MON
    //1,3,5,7,8,10,12 => 31th
    //4,6,9,11 => 30th
    //2 => 28th
    //1/15 2/5 3/5 4/2 5/7 6/4 7/2 8/6 9/3 10/1 11/5 12/3 => MON
    int M, D;
    cin >> M >> D;
    int tmp = 1;
 
    for (int i = 1; i < M; i++) {
        if (i == 1 || i == 3 || i == 5 || i == 7 || i == 8 || i == 10 || i == 12)
            tmp += 31;
        else if (i == 4 || i == 6 || i == 9 || i == 11)
            tmp += 30;
        else if (i == 2)
            tmp += 28;
    }
    tmp += D;
 
    switch (tmp%7){
        case 0: cout << "SAT"; break;
        case 1: cout << "SUN"; break;
        case 2: cout << "MON"; break;
        case 3: cout << "TUE"; break;
        case 4: cout << "WED"; break;
        case 5: cout << "THU"; break;
        case 6: cout << "FRI"; break;
    }
    return 0;
}