[백준] 📂. (13300번) 방 배정

🗒️ 13300번) 방 배정

#include <iostream>
using namespace std;

int student[7][2]; // [1학년~6학년], [여, 남]

int main() 
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int N, K;
	cin >> N >> K;

	while (N--)
	{
		int S, Y;
		cin >> S >> Y;

		++student[Y][S];
	}

	int room(0);
	for (int y = 0; y < 7; y++)
		for (int s = 0; s < 2; s++)
			room += (student[y][s] / K) + (student[y][s] % K ? 1 : 0);

	cout << room;

	return 0;
}