Cod sursa(job #2503046)

Utilizator ripeanumihaiRipeanu Mihai ripeanumihai Data 2 decembrie 2019 11:04:25
Problema Dirichlet Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.52 kb
#include <iostream>
#include <fstream>
using namespace std;
const int MOD=9999991;
ifstream f("dirichlet.in");
ofstream g("dirichlet.out");
long long power(long long a,int b)
{
    long long p=1;
     while(b)
     {
         if(b&1)
            p=p*a%MOD;
         a=a*a%MOD;
         b>>=1;
     }
     return p;
}
int main()
{
    int N;
    f>>N;
    long long A=1,B=1;
    for(int i=2;i<=N;i++)
    {
        A=A*(N+i)%MOD;
        B=B*i%MOD;
    }
    g<<A*power(B,MOD-2)%MOD;
    return 0;
}