Submission #72433

#	Time	Username	Problem	Language	Result	Execution time	Memory
72433		MANcity	Tents (JOI18_tents)	C++14	100 / 100	202 ms	71232 KiB

tents

#include<iostream>
#include<cstdio>
#include<fstream>
#include<algorithm>
#include<cmath>
#include<map>
#include<queue>
#include<set>
#include<stack>
#include<string>
#include<cstring>
#include<vector>
using namespace std;
#define for1(i,n) for(int i=1;i<=(int)n;i++)
#define for0(i,n) for(int i=0;i<=(int)n;i++)
#define forn(i,n) for(int i=n;i>=1;i--)
#define fo(i,x,y) for(int i=x;i<=(int)y;i++)
#define fr(i,x,y) for(int i=x;i>=(int)y;i--)
#define pb push_back
#define mp make_pair
#define LL long long
const LL Mod=1000*1000*1000+7;
LL dp[3002][3002];
int main()
{
    int w,h;
    cin>>w>>h;
    dp[0][0]=1;
    for1(i,max(w,h))
    {
        dp[i][0]=1;
        dp[0][i]=1;
    }
    for1(i,w)
        for1(j,h)
        {
            LL num2=(j*(j-1))/2;
            dp[i][j]=(dp[i-1][j])%Mod;
            if(j>=2)
                dp[i][j]=(dp[i][j]+((LL)num2*(LL)dp[i-1][j-2])%Mod)%Mod;
            dp[i][j]=(dp[i][j]+((LL)(4*j)*(LL)dp[i-1][j-1])%Mod)%Mod;
            if(i>=2)
                dp[i][j]=(dp[i][j]+((LL)(j*(i-1))*(LL)(dp[i-2][j-1]))%Mod)%Mod;
        }
    cout<<(dp[w][h]-1+Mod)%Mod<<endl;
    return 0;
}
/*
4 3
*/

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