답안 #887833

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
887833	2023-12-15T09:42:05 Z	PM1	Tents (JOI18_tents)	C++17	100 / 100	23 ms	600 KB

tents

#include <bits/stdc++.h>
using namespace std;
#define ll long long int 
const int mxn=3e3+2,M=1e9+7;
int n,m;
ll dp[3][mxn];
int main(){
	cin>>n>>m;
	for(int i=0;i<=m;i++){
		dp[0][i]=1;
	}
	dp[1][0]=dp[2][0]=1;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			ll x1=(j>1)?(j*(j-1))/2*dp[(i+2)%3][j-2]:0;
			ll x2=(i>1)?j*(i-1)*dp[(i+1)%3][j-1]:0;
			ll x3=j*4*dp[(i+2)%3][j-1];
			ll x4=dp[(i+2)%3][j];
			dp[i%3][j]=(x1+x2+x3+x4)%M;
			//cout<<dp[i%3][j]<<" ";
		}
		//cout<<endl;
	}
	cout<<dp[n%3][m]-1<<endl;
}

Subtask #1

48.0 / 48.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	348 KB	Output is correct
10	Correct	0 ms	348 KB	Output is correct
11	Correct	0 ms	348 KB	Output is correct
12	Correct	1 ms	348 KB	Output is correct

Subtask #2

52.0 / 52.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Correct	0 ms	348 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	0 ms	348 KB	Output is correct
5	Correct	0 ms	348 KB	Output is correct
6	Correct	0 ms	348 KB	Output is correct
7	Correct	0 ms	348 KB	Output is correct
8	Correct	0 ms	348 KB	Output is correct
9	Correct	0 ms	348 KB	Output is correct
10	Correct	0 ms	348 KB	Output is correct
11	Correct	0 ms	348 KB	Output is correct
12	Correct	1 ms	348 KB	Output is correct
13	Correct	1 ms	348 KB	Output is correct
14	Correct	0 ms	348 KB	Output is correct
15	Correct	14 ms	492 KB	Output is correct
16	Correct	1 ms	480 KB	Output is correct
17	Correct	3 ms	344 KB	Output is correct
18	Correct	4 ms	348 KB	Output is correct
19	Correct	16 ms	600 KB	Output is correct
20	Correct	13 ms	348 KB	Output is correct
21	Correct	9 ms	344 KB	Output is correct
22	Correct	9 ms	348 KB	Output is correct
23	Correct	5 ms	348 KB	Output is correct
24	Correct	23 ms	500 KB	Output is correct
25	Correct	17 ms	348 KB	Output is correct
26	Correct	22 ms	348 KB	Output is correct
27	Correct	22 ms	504 KB	Output is correct