Cod sursa(job #1653787)

Utilizator andrew_assassin789Andrei Manea andrew_assassin789 Data 16 martie 2016 16:17:05
Problema Invers modular Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 0.61 kb
#include <fstream>
#define w 200000001
using namespace std;
unsigned int n;
long long po(long long a,long long b)
{
    long long rez=1;
    while (b)
    {
        if (b%2) rez=(rez*a)%n;
        a=(a*a)%n;
        b/=2;
    }
    return rez;
}
int main()
{
    ifstream f("inversmodular.in");
    ofstream g("inversmodular.out");
    unsigned int i,phi=0,a,aa;
    f>>a>>n;aa=a;
    for (i=2;i*i<=n&&a;i++)
    {
        if (a%i==0)
        {
            while (a%i==0) a/=i,phi++;
        }
    }
    long long x=po(aa,n-2-phi);
    g<<x<<'\n';
    f.close();
    g.close();
    return 0;
}