Cod sursa(job #1499167)

Utilizator AlexandruRudiAlexandru Rudi AlexandruRudi Data 10 octombrie 2015 12:08:27
Problema Invers modular Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.61 kb
#include <iostream>
#include <fstream>

using namespace std;

int pwr(long long n,long long p){
    int sol=1;
    for(int i=0;((1<<i)<=p); ++i){
        if((1<<i) & p) sol*=n;
        n*=n;
    }
    return sol;
}

long long int n,x,fi;
int main()
{
    ifstream in("inversmodular.in");
    ofstream out("inversmodular.out");
    in >> x >> n;
    fi = n;
    for(int i=2;1ll * i * i <= n;i++){
        if(!(n%i))
        {
           while (!(n%i)) n/=i;
           fi = fi - fi / i;
        }
    }
    if (n != 1) fi -= fi / n;

    int rasp = pwr(x,fi);
    out << rasp;
    return 0;
}