Submission #72456

#	Time	Username	Problem	Language	Result	Execution time	Memory
72456		Vahan	Tents (JOI18_tents)	C++17	0 / 100	2 ms	248 KiB

tents

#include<iostream>
using namespace std;
long long d[3002][3002], n, m;
long long mod = 1000000007;
int main()
{
	cin >> n >> m;
	for (int i = 1; i <= n; i++)
	{
		d[i][0] = 1;
		d[i][1] = i*(i - 1) / 2 + 4 * i + 1;
	}
	for (int i = 1; i <= m; i++)
	{
		d[0][i] = 1;
		d[1][i] = i*(i - 1) / 2 + 4 * i + 1;
	}
	cout << 11 << endl;
	for (long long i = 2; i <= n; i++)
	{
		for (long long j = 2; j <= m; j++)
		{
			d[i][j] = ((i*(i - 1) / 2) * d[i - 2][j - 1] + i * 4 * d[i - 1][j - 1] + i*(j - 1)*d[i - 1][j - 2] + d[i][j - 1]) % mod;
		}
	}
	cout << (d[n][m] - 1 + mod) % mod << endl;
	return 0;
}

• Subtask 1: 0 / 48
• Subtask 2: 0 / 52