Cod sursa(job #2629470)

Utilizator RaduhhRadu Flocea Raduhh Data 20 iunie 2020 23:12:05
Problema Dirichlet Scor 92
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.68 kb
#include <fstream>
#define ll long long
using namespace std;
 
ll n, mod = 9999991, primu;
 
ll lgput (ll n, ll p)
{
    ll aux = 1;
    while(p) {
        if(p % 2 == 1) aux = (aux * n) % mod;
        n = (n * n) % mod;
        p /= 2;
    }
    return aux;
}
 
int main() 
{
    //Prashesk in gradina, foarte calitativ si nu scump, scriti in privat!
    
    ifstream cin("dirichlet.in");
    ofstream cout("dirichlet.out");
    cin>>n;
    ll pr = 1, doi = 1;
    for (ll i=1; i<=n; i++)
        pr = (pr * i) % mod,
        doi = ( (doi * i) % mod * (n+i) ) % mod;

    primu = lgput(((pr*pr)%mod*(n+1))%mod,mod-2);
    
        
    cout<<(primu*doi)%mod;
}