[백준] 1924번 : 2007년 - C#

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

using System;

class Program
{
    static void Main() {
        string[] s=Console.ReadLine().Split(' ');
        int x=int.Parse(s[0]);
        int y=int.Parse(s[1]);
        int[] arr={31,28,31,30,31,30,31,31,30,31,30,31};
        int sum=0;
        for(int i=0;i<x-1;i++){
            sum+=arr[i];
        }
        int day=sum+y;
        if(day%7==0) Console.Write("SUN");
        else if(day%7==1) Console.Write("MON");
        else if(day%7==2) Console.Write("TUE");
        else if(day%7==3) Console.Write("WED");
        else if(day%7==4) Console.Write("THU");
        else if(day%7==5) Console.Write("FRI");
        else Console.Write("SAT");
    }
}