Submission #307046

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
307046	2020-09-26T20:33:43 Z	nafis_shifat	Tents (JOI18_tents)	C++14	100 / 100	194 ms	70776 KB

tents

#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
using namespace std;
const int mxn=1e5+5;
const int inf=1e9;
const ll mod=1e9+7;
ll nc2(ll n) {
	ll res= n * (n-1) /2  % mod;
	
	return res % mod;
}
int main() {
	int h,w;
	cin>>h>>w;


	ll dp[h+1][w+1];
	

	for(int i=1;i<=w;i++) {
		dp[1][i] = ( 4 * i + nc2(i) + 1) % mod ;
		dp[0][i]=1;
	}

	for(int i=1;i<=h;i++) {
		dp[i][1] = ( 4 * i + nc2(i) + 1)  % mod;
		dp[i][0]=1;
	}

	

	


	

	
	for(int i=2;i<=h;i++) {
		for(int j=2;j<=w;j++) {
			dp[i][j] = 4 * j * dp[i-1][j-1] % mod;

			//cout<<dp[i][j]<<endl;

			dp[i][j] += nc2(j) * dp[i-1][j-2] % mod;
			dp[i][j] %= mod;
			//cout<<dp[i][j]<<endl;

			dp[i][j] += (j * (i-1) % mod) * dp[i-2][j-1] % mod;
			dp[i][j] %= mod;
			

			dp[i][j] = (dp[i][j] + dp[i-1][j]) % mod;
			

		}
	}

	cout<<(dp[h][w] - 1 + mod) % mod<<endl;
}

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	256 KB	Output is correct
2	Correct	0 ms	256 KB	Output is correct
3	Correct	1 ms	256 KB	Output is correct
4	Correct	1 ms	384 KB	Output is correct
5	Correct	1 ms	384 KB	Output is correct
6	Correct	1 ms	512 KB	Output is correct
7	Correct	1 ms	512 KB	Output is correct
8	Correct	1 ms	384 KB	Output is correct
9	Correct	0 ms	256 KB	Output is correct
10	Correct	1 ms	640 KB	Output is correct
11	Correct	1 ms	384 KB	Output is correct
12	Correct	2 ms	1024 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	256 KB	Output is correct
2	Correct	0 ms	256 KB	Output is correct
3	Correct	1 ms	256 KB	Output is correct
4	Correct	1 ms	384 KB	Output is correct
5	Correct	1 ms	384 KB	Output is correct
6	Correct	1 ms	512 KB	Output is correct
7	Correct	1 ms	512 KB	Output is correct
8	Correct	1 ms	384 KB	Output is correct
9	Correct	0 ms	256 KB	Output is correct
10	Correct	1 ms	640 KB	Output is correct
11	Correct	1 ms	384 KB	Output is correct
12	Correct	2 ms	1024 KB	Output is correct
13	Correct	0 ms	384 KB	Output is correct
14	Correct	1 ms	384 KB	Output is correct
15	Correct	127 ms	44152 KB	Output is correct
16	Correct	8 ms	3200 KB	Output is correct
17	Correct	28 ms	10112 KB	Output is correct
18	Correct	34 ms	12408 KB	Output is correct
19	Correct	142 ms	51448 KB	Output is correct
20	Correct	111 ms	41080 KB	Output is correct
21	Correct	73 ms	27128 KB	Output is correct
22	Correct	72 ms	26744 KB	Output is correct
23	Correct	40 ms	14968 KB	Output is correct
24	Correct	194 ms	70776 KB	Output is correct
25	Correct	144 ms	52600 KB	Output is correct
26	Correct	164 ms	60280 KB	Output is correct
27	Correct	188 ms	68088 KB	Output is correct