Submission #135272

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
135272	2019-07-24T01:16:59 Z	mohammedehab2002	Tents (JOI18_tents)	C++11	100 / 100	348 ms	36088 KB

tents

#include <iostream>
#include <string.h>
using namespace std;
#define mod 1000000007
int dp[3005][3005];
int solve(int n,int m)
{
	if (!n || !m)
	return 1;
	if (dp[n][m]!=-1)
	return dp[n][m];
	int ans=(solve(n-1,m)+4LL*m*solve(n-1,m-1))%mod;
	if (m>=2)
	ans=(ans+1LL*m*(m-1)/2*solve(n-1,m-2))%mod;
	if (n>=2)
	ans=(ans+(n-1LL)*m*solve(n-2,m-1))%mod;
	return dp[n][m]=ans;
}
int main()
{
	int n,m;
	cin >> n >> m;
	memset(dp,-1,sizeof(dp));
	cout << (solve(n,m)-1+mod)%mod;
}

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	31 ms	35704 KB	Output is correct
2	Correct	31 ms	35580 KB	Output is correct
3	Correct	31 ms	35704 KB	Output is correct
4	Correct	32 ms	35704 KB	Output is correct
5	Correct	32 ms	35704 KB	Output is correct
6	Correct	31 ms	35704 KB	Output is correct
7	Correct	32 ms	35704 KB	Output is correct
8	Correct	32 ms	35704 KB	Output is correct
9	Correct	31 ms	35704 KB	Output is correct
10	Correct	33 ms	35704 KB	Output is correct
11	Correct	32 ms	35704 KB	Output is correct
12	Correct	34 ms	35704 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	31 ms	35704 KB	Output is correct
2	Correct	31 ms	35580 KB	Output is correct
3	Correct	31 ms	35704 KB	Output is correct
4	Correct	32 ms	35704 KB	Output is correct
5	Correct	32 ms	35704 KB	Output is correct
6	Correct	31 ms	35704 KB	Output is correct
7	Correct	32 ms	35704 KB	Output is correct
8	Correct	32 ms	35704 KB	Output is correct
9	Correct	31 ms	35704 KB	Output is correct
10	Correct	33 ms	35704 KB	Output is correct
11	Correct	32 ms	35704 KB	Output is correct
12	Correct	34 ms	35704 KB	Output is correct
13	Correct	32 ms	35704 KB	Output is correct
14	Correct	32 ms	35832 KB	Output is correct
15	Correct	231 ms	35932 KB	Output is correct
16	Correct	33 ms	35704 KB	Output is correct
17	Correct	51 ms	35704 KB	Output is correct
18	Correct	78 ms	35832 KB	Output is correct
19	Correct	264 ms	36088 KB	Output is correct
20	Correct	212 ms	35832 KB	Output is correct
21	Correct	133 ms	35804 KB	Output is correct
22	Correct	150 ms	35832 KB	Output is correct
23	Correct	104 ms	35996 KB	Output is correct
24	Correct	348 ms	35960 KB	Output is correct
25	Correct	264 ms	35940 KB	Output is correct
26	Correct	300 ms	35960 KB	Output is correct
27	Correct	338 ms	35960 KB	Output is correct