1924 : 2007년 [C++]

#include <iostream>

using namespace std;

enum DAY { SUN, MON, TUE, WED, THU, FRI, SAT };

int main()
{
 int Calendar[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
 int x; int y;
 cin >> x >> y;
 
 int Day = SUN;
 
 for (int i = 0; i < x - 1; i++)
  Day += Calendar[i];
 Day += y;
 Day %= 7;

 switch (Day)
 {
  case SUN: cout << "SUN"; break;
  case MON: cout << "MON"; break;
  case TUE: cout << "TUE"; break;
  case WED: cout << "WED"; break;
  case THU: cout << "THU"; break;
  case FRI: cout << "FRI"; break;
  case SAT: cout << "SAT"; break;
 }

 return 0;
}