Cod sursa(job #2232351)

Utilizator lixiLixandru Andrei lixi Data 18 august 2018 19:26:40
Problema Dirichlet Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.81 kb
#include <iostream>
#include<fstream>
using namespace std;
ifstream f("dirichlet.in");
ofstream g("dirichlet.out");
const int MOD=9999991;
void EuclidExtins(int a, int b, int &d, int &x, int &y)
{
    int x1 = 0, y1 = 1;
    x = 1, y = 0;
    while(b != 0)
    {
        int q = a / b;
        int r = a % b;
        a = b;
        b = r;
        int x0 = x - x1 * q;
        int y0 = y - y1 * q;
        x = x1;
        y = y1;
        x1 = x0;
        y1 = y0;
    }
    d = a;
}
long long inversmodular(int A, int N)
{
    int X, Y, d;
    EuclidExtins(A, N, d, X, Y);
    X %= N;
    if(X < 0)X += N;
    return X;
}
int main()
{int N;
f>>N;
long long r=1,fr=1;
for(int i=2;i<=N;i++)
    {r=r*(N+i)%MOD;
    fr=fr*i%MOD;}


g<<r*inversmodular(fr,MOD)%MOD;


    return 0;
}