Submission #1109753

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109753		Warinchai	Tents (JOI18_tents)	C++14	48 / 100	484 ms	219932 KiB

tents

#include<bits/stdc++.h>
#define int long long
using namespace std;
int dp[305][305][305];
int md=1e9+7;
int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int h,w;cin>>h>>w;
    dp[0][w][0]=1;
    for(int i=0;i<=h;i++){
        for(int j=0;j<=w;j++){
            for(int k=0;k<=w;k++){
                dp[i+1][j-1][k]=(dp[i+1][j-1][k]+3*j*dp[i][j][k])%md;
                dp[i+1][j-1][k+1]=(dp[i+1][j-1][k+1]+dp[i][j][k]*j)%md;
                dp[i+1][j][k-1]=(dp[i+1][j][k-1]+dp[i][j][k]*k)%md;
                dp[i+1][j-2][k]=(dp[i+1][j-2][k]+j*(j-1)/2*dp[i][j][k])%md;
                dp[i+1][j][k]=(dp[i+1][j][k]+dp[i][j][k])%md;
            }
        }
    }
    int ans=0;
    for(int i=0;i<=w;i++)for(int j=0;j<=w;j++)ans=(ans+dp[h][i][j])%md;
    cout<<(ans-1)%md<<"\n";
}
//ill finish later

• Subtask 1: 48 / 48
• Subtask 2: 0 / 52