Submission #202191

#	Time	Username	Problem	Language	Result	Execution time	Memory
202191		nvmdava	Tents (JOI18_tents)	C++17	100 / 100	68 ms	70904 KiB

tents

#include <iostream>
long long dp[3005][3005],n,m,i,j;int main(){std::cin>>n>>m;for(i=0;i<=3000;++i)dp[i][0]=dp[0][i]=1;for(i=1;i<=n;++i)for(j=1;j<=m;++j)dp[i][j]=(dp[i-1][j]+(j>=2?j*(j-1)/2*dp[i-1][j-2]:0)+4*j*dp[i-1][j-1]+(i>=2?dp[i-2][j-1]*j*(i-1):0))%1000000007;std::cout<<dp[n][m]-1;}

• Subtask 1: 48 / 48
• Subtask 2: 52 / 52