답안 #94112

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
94112	2019-01-16T06:40:58 Z	autumn_eel	Tents (JOI18_tents)	C++14	100 / 100	139 ms	82248 KB

tents

#include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
#define MOD 1000000007
using namespace std;
typedef long long ll;

ll dp[4000][4000];
int main(){
	int h,w;cin>>h>>w;
	dp[0][w]=1;
	rep(i,h)rep(j,w+1){
		//0
		(dp[i+1][j]+=dp[i][j])%=MOD;
		//1
		if(j)(dp[i+1][j-1]+=dp[i][j]*j*4)%=MOD;
		//N-S
		if(j&&i<h-1)(dp[i+2][j-1]+=dp[i][j]*j*(h-i-1))%=MOD;
		//E-W
		if(j>=2)(dp[i+1][j-2]+=dp[i][j]*(j*(j-1)/2))%=MOD;
	}
	ll ans=0;
	rep(i,w+1)(ans+=dp[h][i])%=MOD;
	cout<<(ans+MOD-1)%MOD<<endl;
}

Subtask #1

48.0 / 48.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	376 KB	Output is correct
3	Correct	2 ms	504 KB	Output is correct
4	Correct	2 ms	1148 KB	Output is correct
5	Correct	2 ms	632 KB	Output is correct
6	Correct	2 ms	1400 KB	Output is correct
7	Correct	2 ms	888 KB	Output is correct
8	Correct	3 ms	1400 KB	Output is correct
9	Correct	2 ms	764 KB	Output is correct
10	Correct	17 ms	1784 KB	Output is correct
11	Correct	2 ms	376 KB	Output is correct
12	Correct	4 ms	2168 KB	Output is correct

Subtask #2

52.0 / 52.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	376 KB	Output is correct
3	Correct	2 ms	504 KB	Output is correct
4	Correct	2 ms	1148 KB	Output is correct
5	Correct	2 ms	632 KB	Output is correct
6	Correct	2 ms	1400 KB	Output is correct
7	Correct	2 ms	888 KB	Output is correct
8	Correct	3 ms	1400 KB	Output is correct
9	Correct	2 ms	764 KB	Output is correct
10	Correct	17 ms	1784 KB	Output is correct
11	Correct	2 ms	376 KB	Output is correct
12	Correct	4 ms	2168 KB	Output is correct
13	Correct	2 ms	376 KB	Output is correct
14	Correct	10 ms	9640 KB	Output is correct
15	Correct	96 ms	55096 KB	Output is correct
16	Correct	7 ms	3960 KB	Output is correct
17	Correct	24 ms	12764 KB	Output is correct
18	Correct	31 ms	16888 KB	Output is correct
19	Correct	112 ms	63096 KB	Output is correct
20	Correct	88 ms	50652 KB	Output is correct
21	Correct	58 ms	33528 KB	Output is correct
22	Correct	57 ms	35192 KB	Output is correct
23	Correct	40 ms	26744 KB	Output is correct
24	Correct	139 ms	82248 KB	Output is correct
25	Correct	107 ms	62684 KB	Output is correct
26	Correct	118 ms	70904 KB	Output is correct
27	Correct	133 ms	79352 KB	Output is correct