Submission #1022051

#	Time	Username	Problem	Language	Result	Execution time	Memory
1022051		modwwe	Tents (JOI18_tents)	C++17	100 / 100	131 ms	70992 KiB

tents

//https://www.instagram.com/_modwwe/
#pragma GCC optimize("Ofast,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2")
#include<bits/stdc++.h>
#define int long long
//#define ll long long
#define down cout<<'\n';
#define debug cout<<" cucuucucuuu",down
#define NHP     ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
#define modwwe  int t;cin>>t; while(t--)
#define bit(i,j) (i>>j&1)
#define sobit(a) __builtin_popcountll(a)
#define task "test"
#define fin(x) freopen(x".inp","r",stdin)
#define fou(x) freopen(x".ans ","w",stdout)
#define pb push_back
#define checktime   cerr << (double)clock() / CLOCKS_PER_SEC * 1000  << " ms";
using namespace std;
void phongbeo();
const int inf=1e18;
const int mod2=1e9+7;
const int  mod1=998244353;
struct icd
{
    int a,b;
};
struct ib
{
    int a;
    int b;
};
struct ic
{
    int a,b,c;
};
struct id
{
    int a,b,c,d;
};
struct ie
{
    int a,b,c, d,e,f;

};
int n,m,s1,s2,s4,s3,sf,k,r,mid,s5,s6,mx,s7,s8,s9,mx2,res,dem2=0,dem=0,l;
int  i,s10,s12;
int el=29;
 main()
{
#ifndef ONLINE_JUDGE
///  fin(task),fou(task);
#endif
    NHP
    /// cin>>s1;
    //  modwwe
    phongbeo();
}
int fac[3001];
int invf[3001];
int dp[3003][3003];
int ipow(int x, int p){
	int  ret = 1, piv = x;
	while(p){
		if(p&1) ret *= piv;
		piv *= piv;
		ret %= mod2;
		piv %= mod2;
		p >>= 1;
	}
	return ret;
}
int bino(int x, int y){
	return fac[x] * (invf[x-y] * invf[y] % mod2) % mod2;
}
void phongbeo()
{
     cin>>n>>m;
      fac[0]=invf[0]=1;
          for(int i=1;i<=n;i++){
            fac[i]=(i*fac[i-1])%mod2;
            		invf[i] = ipow(fac[i], mod2 - 2);
            		 }
  dp[0][m]=1;
 for(int i=1;i<=n;i++)
     for(int j=0;j<m;j++)
     {
          dp[i][j]=(dp[i-1][j+1]*4*(j+1)+dp[i][j])%mod2;
          dp[i][j]=(dp[i-1][j+2]*(j+2)*(j+1)/2+dp[i][j])%mod2;
     if(i>=2)      dp[i][j]=(dp[i-2][j+1]*(j+1)*(i-1)+dp[i][j])%mod2;
     }
     s3=0;
     for(int i=1;i<=n;i++){
        s2=bino(n,i);
        for(int j=0;j<m;j++)
            s3=(s3+dp[i][j]*s2)%mod2;
     }
     cout<<s3%mod2;
}

Compilation message (stderr)

tents.cpp:48:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   48 |  main()
      |  ^~~~
tents.cpp: In function 'void phongbeo()':
tents.cpp:84:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   84 |  for(int i=1;i<=n;i++)
      |  ^~~
tents.cpp:91:6: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   91 |      s3=0;
      |      ^~

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