Submission #310698

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
310698	2020-10-07T16:18:14 Z	arnold518	Tents (JOI18_tents)	C++14	100 / 100	155 ms	71040 KB

tents

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 3000;
const ll MOD = 1e9+7;

int N, M;
ll dp[MAXN+10][MAXN+10];

int main()
{
	scanf("%d%d", &N, &M);
	for(int i=0; i<=N; i++)
	{
		for(int j=0; j<=M; j++)
		{
			if(i==0 || j==0)
			{
				dp[i][j]=1;
				continue;
			}
			if(j>=2) dp[i][j]+=(ll)j*(j-1)/2*dp[i-1][j-2]%MOD;
			dp[i][j]+=(ll)4*j*dp[i-1][j-1]%MOD;
			if(i>=2) dp[i][j]+=(ll)j*(i-1)*dp[i-2][j-1]%MOD;
			dp[i][j]+=dp[i-1][j];
			dp[i][j]%=MOD;
		}
	}
	printf("%lld\n", (dp[N][M]+MOD-1)%MOD);
}

Compilation message

tents.cpp: In function 'int main()':
tents.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |  scanf("%d%d", &N, &M);
      |  ~~~~~^~~~~~~~~~~~~~~~

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	256 KB	Output is correct
2	Correct	1 ms	384 KB	Output is correct
3	Correct	1 ms	512 KB	Output is correct
4	Correct	1 ms	1152 KB	Output is correct
5	Correct	1 ms	756 KB	Output is correct
6	Correct	1 ms	1408 KB	Output is correct
7	Correct	1 ms	768 KB	Output is correct
8	Correct	1 ms	1408 KB	Output is correct
9	Correct	1 ms	768 KB	Output is correct
10	Correct	2 ms	1792 KB	Output is correct
11	Correct	1 ms	384 KB	Output is correct
12	Correct	3 ms	2304 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	256 KB	Output is correct
2	Correct	1 ms	384 KB	Output is correct
3	Correct	1 ms	512 KB	Output is correct
4	Correct	1 ms	1152 KB	Output is correct
5	Correct	1 ms	756 KB	Output is correct
6	Correct	1 ms	1408 KB	Output is correct
7	Correct	1 ms	768 KB	Output is correct
8	Correct	1 ms	1408 KB	Output is correct
9	Correct	1 ms	768 KB	Output is correct
10	Correct	2 ms	1792 KB	Output is correct
11	Correct	1 ms	384 KB	Output is correct
12	Correct	3 ms	2304 KB	Output is correct
13	Correct	1 ms	384 KB	Output is correct
14	Correct	6 ms	9728 KB	Output is correct
15	Correct	104 ms	55244 KB	Output is correct
16	Correct	7 ms	4096 KB	Output is correct
17	Correct	24 ms	12928 KB	Output is correct
18	Correct	30 ms	17024 KB	Output is correct
19	Correct	119 ms	62968 KB	Output is correct
20	Correct	97 ms	50936 KB	Output is correct
21	Correct	63 ms	33912 KB	Output is correct
22	Correct	65 ms	35448 KB	Output is correct
23	Correct	39 ms	27128 KB	Output is correct
24	Correct	155 ms	71040 KB	Output is correct
25	Correct	125 ms	61432 KB	Output is correct
26	Correct	138 ms	66808 KB	Output is correct
27	Correct	154 ms	69112 KB	Output is correct