Submission #851010

#	Time	Username	Problem	Language	Result	Execution time	Memory
851010		8pete8	Tents (JOI18_tents)	C++17	100 / 100	93 ms	71760 KiB

tents

#include<iostream>
#include<stack>
#include<map>
#include<vector>
#include<string>
#include<unordered_map>
#include <queue>
#include<cstring>
#include<limits.h>
#include<cmath>
#include<set>
#include<algorithm>
#include<bitset>
//#include "supertrees.h"
using namespace std;
#define ll long long
#define f first
#define endl "\n"
#define s second
#define pii pair<int,int>
#define ppii pair<int,pii>
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define F(n) for(int i=0;i<n;i++)
#define lb lower_bound
#define fastio ios::sync_with_stdio(false);cin.tie(NULL);
using namespace std;
#define int long long
const int mxn=3003,mod=1000000007,lg=20,root=80,inf=1e18;
void setIO(string name) {
	ios_base::sync_with_stdio(0); cin.tie(0);
	freopen((name+".in").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}
int dp[mxn+10][mxn+10],pl[mxn+10][mxn+10],pu[mxn+10][mxn+10];
int cnt[mxn+10];
int32_t main(){
    fastio
    int n,m;cin>>n>>m;
    for(int i=0;i<=mxn;i++)dp[0][i]=dp[i][0]=1;
    for(int i=1;i<=mxn;i++){//main ;to not over count
        for(int j=1;j<=mxn;j++){
            dp[i][j]+=dp[i-1][j]+(dp[i-1][j-1]*4*j)%mod;
            dp[i][j]%=mod;
            if(i>=2)dp[i][j]+=(dp[i-2][j-1]*(i-1)*j%mod)%mod;
            dp[i][j]%=mod;
            if(j>=2)dp[i][j]+=(dp[i-1][j-2]*(((j*(j-1))/2))%mod)%mod;
            dp[i][j]%=mod;
        }
    }
    cout<<dp[n][m]-1;
    return 0;
}

Compilation message (stderr)

tents.cpp: In function 'void setIO(std::string)':
tents.cpp:33:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tents.cpp:34:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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