思路很简单，就是先算出来目标日期距离4月12日有多少天

最后加上4再对7取模就是目标日期的星期数

#include<iostream>
using namespace std;
int main()
{
	int days[13] = {0,0,0,0,30,31,30,31,31,30,31,30,31 };
	int m, d, cntday = 0;
	cin >> m >> d;
	for (int i = 4; i < m; i++)
		cntday += days[i];
	cntday = cntday - 12 + d;
	switch ((cntday + 4) % 7)
	{
	case 0:cout << "Sunday"; break;
	case 1:cout << "Monday"; break;
	case 2:cout << "Tuesday"; break;
	case 3:cout << "Wednesday"; break;
	case 4:cout << "Thursday "; break;
	case 5:cout << "Friday"; break;
	case 6:cout << "Saturday"; break;
	}
	return 0;
}