Cod sursa(job #2503047)

Utilizator Arina2003Arina Aioanei Arina2003 Data 2 decembrie 2019 11:09:31
Problema Dirichlet Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.5 kb
#include <fstream>

using namespace std;

ifstream f("dirichlet.in");
ofstream g("dirichlet.out");

const int MOD=9999991;

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;
}