Submission #331391

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
331391	2020-11-28T09:52:59 Z	GioChkhaidze	Tents (JOI18_tents)	C++14	100 / 100	319 ms	70892 KB

tents

#include <bits/stdc++.h>

#define ll long long

using namespace std;

const int N=3003;

ll n,m,dp[N][N],mod=1e9+7;

main () {
	cin>>n>>m;

	for (int i=0; i<=max(n,m); i++)
		dp[i][0]=dp[0][i]=1;

	for (int i=1; i<=n; i++)
		for (int j=1; j<=m; j++) {
			if (1<=i) dp[i][j]=(dp[i][j]+dp[i-1][j])%mod;
			if (1<=i && 1<=j) dp[i][j]=(dp[i][j]+j*dp[i-1][j-1]*4)%mod;
			if (2<=i && 1<=j) dp[i][j]=(dp[i][j]+j*(i-1)*dp[i-2][j-1])%mod;
			if (1<=i && 2<=j) dp[i][j]=(dp[i][j]+((j-1)*j/2)*dp[i-1][j-2])%mod;
		}
	
	cout<<(dp[n][m]-1+mod)%mod<<"\n";
}

Compilation message

tents.cpp:11:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   11 | main () {
      |       ^

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	364 KB	Output is correct
2	Correct	1 ms	1004 KB	Output is correct
3	Correct	1 ms	492 KB	Output is correct
4	Correct	1 ms	1132 KB	Output is correct
5	Correct	2 ms	1516 KB	Output is correct
6	Correct	2 ms	1388 KB	Output is correct
7	Correct	2 ms	1388 KB	Output is correct
8	Correct	1 ms	1516 KB	Output is correct
9	Correct	1 ms	876 KB	Output is correct
10	Correct	2 ms	1772 KB	Output is correct
11	Correct	1 ms	1516 KB	Output is correct
12	Correct	4 ms	2284 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	364 KB	Output is correct
2	Correct	1 ms	1004 KB	Output is correct
3	Correct	1 ms	492 KB	Output is correct
4	Correct	1 ms	1132 KB	Output is correct
5	Correct	2 ms	1516 KB	Output is correct
6	Correct	2 ms	1388 KB	Output is correct
7	Correct	2 ms	1388 KB	Output is correct
8	Correct	1 ms	1516 KB	Output is correct
9	Correct	1 ms	876 KB	Output is correct
10	Correct	2 ms	1772 KB	Output is correct
11	Correct	1 ms	1516 KB	Output is correct
12	Correct	4 ms	2284 KB	Output is correct
13	Correct	4 ms	7788 KB	Output is correct
14	Correct	5 ms	9708 KB	Output is correct
15	Correct	199 ms	55348 KB	Output is correct
16	Correct	15 ms	9452 KB	Output is correct
17	Correct	46 ms	17388 KB	Output is correct
18	Correct	58 ms	17900 KB	Output is correct
19	Correct	234 ms	63084 KB	Output is correct
20	Correct	191 ms	50924 KB	Output is correct
21	Correct	129 ms	35564 KB	Output is correct
22	Correct	119 ms	35436 KB	Output is correct
23	Correct	68 ms	27116 KB	Output is correct
24	Correct	319 ms	70892 KB	Output is correct
25	Correct	237 ms	61180 KB	Output is correct
26	Correct	270 ms	66672 KB	Output is correct
27	Correct	300 ms	69228 KB	Output is correct