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
#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;
}
# 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
# 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