Submission #68617

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
68617	2018-08-17T14:34:40 Z	TadijaSebez	Tents (JOI18_tents)	C++11	100 / 100	218 ms	36004 KB

tents

#include <stdio.h>
#define ll long long
const int N=3005;
const int mod=1e9+7;
int dp[N][N];
int main()
{
	int n,m,i,j;
	scanf("%i %i",&n,&m);
	for(i=0;i<=n;i++)
	{
		for(j=0;j<=m;j++)
		{
			if(i==0 || j==0){ dp[i][j]=1;continue;}
			dp[i][j]=dp[i-1][j]+(ll)dp[i-1][j-1]*j%mod*4%mod;
			dp[i][j]%=mod;
			if(i>1) dp[i][j]+=(ll)dp[i-2][j-1]*j%mod*(i-1)%mod;
			dp[i][j]%=mod;
			if(j>1) dp[i][j]+=(ll)dp[i-1][j-2]*((ll)j*(j-1)/2%mod)%mod;
			dp[i][j]%=mod;
		}
	}
	printf("%i\n",(dp[n][m]+mod-1)%mod);
	return 0;
}

Compilation message

tents.cpp: In function 'int main()':
tents.cpp:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i %i",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	376 KB	Output is correct
3	Correct	2 ms	728 KB	Output is correct
4	Correct	3 ms	1412 KB	Output is correct
5	Correct	3 ms	1412 KB	Output is correct
6	Correct	4 ms	1488 KB	Output is correct
7	Correct	3 ms	1488 KB	Output is correct
8	Correct	5 ms	1668 KB	Output is correct
9	Correct	3 ms	1668 KB	Output is correct
10	Correct	4 ms	1932 KB	Output is correct
11	Correct	2 ms	1932 KB	Output is correct
12	Correct	5 ms	2068 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	376 KB	Output is correct
3	Correct	2 ms	728 KB	Output is correct
4	Correct	3 ms	1412 KB	Output is correct
5	Correct	3 ms	1412 KB	Output is correct
6	Correct	4 ms	1488 KB	Output is correct
7	Correct	3 ms	1488 KB	Output is correct
8	Correct	5 ms	1668 KB	Output is correct
9	Correct	3 ms	1668 KB	Output is correct
10	Correct	4 ms	1932 KB	Output is correct
11	Correct	2 ms	1932 KB	Output is correct
12	Correct	5 ms	2068 KB	Output is correct
13	Correct	2 ms	2068 KB	Output is correct
14	Correct	9 ms	9884 KB	Output is correct
15	Correct	143 ms	33108 KB	Output is correct
16	Correct	12 ms	33108 KB	Output is correct
17	Correct	32 ms	33108 KB	Output is correct
18	Correct	45 ms	33108 KB	Output is correct
19	Correct	175 ms	34968 KB	Output is correct
20	Correct	151 ms	34968 KB	Output is correct
21	Correct	95 ms	34968 KB	Output is correct
22	Correct	96 ms	34968 KB	Output is correct
23	Correct	64 ms	34968 KB	Output is correct
24	Correct	218 ms	36004 KB	Output is correct
25	Correct	213 ms	36004 KB	Output is correct
26	Correct	179 ms	36004 KB	Output is correct
27	Correct	205 ms	36004 KB	Output is correct