Submission #610089

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
610089	2022-07-28T04:53:40 Z	penguinhacker	Tents (JOI18_tents)	C++17	100 / 100	117 ms	70764 KB

tents

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ar array

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

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> m;
	for (int i=0; i<=max(n, m); ++i)
		dp[0][i]=dp[i][0]=1;
	for (int i=1; i<=n; ++i)
		for (int j=1; j<=m; ++j) {
			// two tents on row 1
			dp[i][j]=dp[i-1][j];
			if (j>=2)
				dp[i][j]=(dp[i][j]+dp[i-1][j-2]*j*(j-1)/2)%M;
			dp[i][j]=(dp[i][j]+dp[i-1][j-1]*4*j)%M;
			if (i>=2)
				dp[i][j]=(dp[i][j]+dp[i-2][j-1]*j*(i-1))%M;
		}
	cout << (dp[n][m]-1+M)%M;
	return 0;
}

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	1 ms	980 KB	Output is correct
3	Correct	1 ms	468 KB	Output is correct
4	Correct	1 ms	1096 KB	Output is correct
5	Correct	1 ms	1356 KB	Output is correct
6	Correct	1 ms	1364 KB	Output is correct
7	Correct	1 ms	1364 KB	Output is correct
8	Correct	1 ms	1364 KB	Output is correct
9	Correct	1 ms	724 KB	Output is correct
10	Correct	2 ms	1748 KB	Output is correct
11	Correct	1 ms	1492 KB	Output is correct
12	Correct	3 ms	2132 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	1 ms	980 KB	Output is correct
3	Correct	1 ms	468 KB	Output is correct
4	Correct	1 ms	1096 KB	Output is correct
5	Correct	1 ms	1356 KB	Output is correct
6	Correct	1 ms	1364 KB	Output is correct
7	Correct	1 ms	1364 KB	Output is correct
8	Correct	1 ms	1364 KB	Output is correct
9	Correct	1 ms	724 KB	Output is correct
10	Correct	2 ms	1748 KB	Output is correct
11	Correct	1 ms	1492 KB	Output is correct
12	Correct	3 ms	2132 KB	Output is correct
13	Correct	3 ms	7756 KB	Output is correct
14	Correct	4 ms	9684 KB	Output is correct
15	Correct	67 ms	55112 KB	Output is correct
16	Correct	8 ms	9428 KB	Output is correct
17	Correct	21 ms	17284 KB	Output is correct
18	Correct	22 ms	17736 KB	Output is correct
19	Correct	69 ms	62944 KB	Output is correct
20	Correct	55 ms	50800 KB	Output is correct
21	Correct	41 ms	35408 KB	Output is correct
22	Correct	37 ms	35480 KB	Output is correct
23	Correct	26 ms	26968 KB	Output is correct
24	Correct	117 ms	70764 KB	Output is correct
25	Correct	78 ms	61132 KB	Output is correct
26	Correct	78 ms	66496 KB	Output is correct
27	Correct	85 ms	69052 KB	Output is correct