Submission #586108

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
586108	2022-06-29T22:34:45 Z	GusterGoose27	Tents (JOI18_tents)	C++11	100 / 100	111 ms	70704 KB

tents

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int MAXN = 3000;
const int MOD = 1e9+7;
ll dp[MAXN+1][MAXN+1];
ll n, m;

int main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL);
	cin >> n >> m;
	for (ll i = 0; i <= n; i++) {
		for (ll j = 0; j <= m; j++) {
			if (i == 0 || j == 0) {
				dp[i][j] = 1;
				continue;
			}
			ll m1 = j*(i-1);
			m1 %= MOD;
			ll m2 = j*(j-1)/2;
			m2 %= MOD;
			dp[i][j] += 4*j*dp[i-1][j-1];
			dp[i][j] %= MOD;
			dp[i][j] += dp[i-1][j];
			dp[i][j] %= MOD;
			if (j > 1) dp[i][j] += m2*dp[i-1][j-2];
			dp[i][j] %= MOD;
			if (i > 1) dp[i][j] += m1*dp[i-2][j-1];
			dp[i][j] %= MOD;
		}
	}
	cout << ((dp[n][m]-1+MOD)%MOD) << "\n";
}

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	1 ms	212 KB	Output is correct
3	Correct	1 ms	452 KB	Output is correct
4	Correct	1 ms	1140 KB	Output is correct
5	Correct	1 ms	708 KB	Output is correct
6	Correct	2 ms	1364 KB	Output is correct
7	Correct	1 ms	724 KB	Output is correct
8	Correct	1 ms	1348 KB	Output is correct
9	Correct	1 ms	708 KB	Output is correct
10	Correct	1 ms	1748 KB	Output is correct
11	Correct	1 ms	324 KB	Output is correct
12	Correct	2 ms	2132 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	1 ms	212 KB	Output is correct
3	Correct	1 ms	452 KB	Output is correct
4	Correct	1 ms	1140 KB	Output is correct
5	Correct	1 ms	708 KB	Output is correct
6	Correct	2 ms	1364 KB	Output is correct
7	Correct	1 ms	724 KB	Output is correct
8	Correct	1 ms	1348 KB	Output is correct
9	Correct	1 ms	708 KB	Output is correct
10	Correct	1 ms	1748 KB	Output is correct
11	Correct	1 ms	324 KB	Output is correct
12	Correct	2 ms	2132 KB	Output is correct
13	Correct	1 ms	340 KB	Output is correct
14	Correct	4 ms	9684 KB	Output is correct
15	Correct	85 ms	55172 KB	Output is correct
16	Correct	7 ms	3956 KB	Output is correct
17	Correct	17 ms	12756 KB	Output is correct
18	Correct	22 ms	16972 KB	Output is correct
19	Correct	85 ms	62908 KB	Output is correct
20	Correct	67 ms	50820 KB	Output is correct
21	Correct	46 ms	33800 KB	Output is correct
22	Correct	49 ms	35440 KB	Output is correct
23	Correct	28 ms	26956 KB	Output is correct
24	Correct	111 ms	70704 KB	Output is correct
25	Correct	85 ms	61148 KB	Output is correct
26	Correct	96 ms	66540 KB	Output is correct
27	Correct	107 ms	68824 KB	Output is correct