Submission #1214702

#	Time	Username	Problem	Language	Result	Execution time	Memory
1214702		Malix	Tents (JOI18_tents)	C++20	100 / 100	187 ms	71116 KiB

tents

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int,int> pi;
typedef vector<pi> pii;
typedef tuple<int,int,int> ti;
typedef vector<ll> li;
typedef vector<li> lii;
 
#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define LSOne(s) ((s)&(-s))

ll INF=1000000000000000010;
int inf=1e9+10;
ll M=1e9+7;

int n,m;
ll dp[3001][3001];

ll solve(int x,int y){
    if(x<=0||y<=0)return 1;
    if(dp[x][y]!=-1)return dp[x][y];
    dp[x][y]=0;
    dp[x][y]+=solve(x-1,y);
    dp[x][y]+=solve(x-1,y-2)*(ll)((y*(y-1))/2);
    dp[x][y]+=solve(x-1,y-1)*(ll)(y*4);
    dp[x][y]+=solve(x-2,y-1)*(ll)(y*(x-1));
    dp[x][y]%=M;
    return dp[x][y];
}

int main() {   
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin>>n>>m;
    REP(i,0,3001)REP(j,0,3001)dp[i][j]=-1;
    cout<<solve(n,m)-1;
}

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