Submission #1108872

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108872		Warinchai	Tents (JOI18_tents)	C++14	0 / 100	2 ms	3408 KiB

tents

#include<bits/stdc++.h>
using namespace std;
int dp[3005][3005];
int sum[3005][3005];
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int h,w;cin>>h>>w;
    dp[0][w]=1;
    for(int i=0;i<=h;i++){
        for(int j=0;j<=w;j++){
            dp[i+1][j]+=dp[i][j];
            if(j>0)dp[i+1][j-1]+=dp[i][j]*j*4;
            if(j>1)dp[i+1][j-2]+=dp[i][j]*j*(j-1)/2;
            dp[i+1][j]+=sum[i][j];
            sum[i+1][j]+=sum[i][j];
            if(j>0)sum[i+1][j-1]+=(sum[i][j]*j)+dp[i][j]*j;
            //
            sum[i+1][j]+=sum[i][j]-sum[i][j];//wrong
            //
            if(j>0)sum[i+1][j-1]+=sum[i][j]*3*j;
            if(j>1)sum[i+1][j-2]+=sum[i][j]*j*(j-1)/2;

        }
    }
    int ans=0;
    for(int i=0;i<=w;i++){
        ans+=dp[h][i];
    }
    cout<<ans-1<<"\n";
}
//ill finish later

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