Cod sursa(job #2123697)

Utilizator AlexVulpoiuAlexandru Vulpoiu AlexVulpoiu Data 6 februarie 2018 15:41:30
Problema Invers modular Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 0.59 kb
#include <cstdio>
using namespace std;
int a,n,d,p,nr,aux;
int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d %d\n",&a,&n);
    nr=n;
    p=n;
    for(d=2;d*d<=n;d++)
        if(!(n%d))
        {
            while(n%d==0)
                n/=d;
            p=(p/d)*(d-1);
            if(n==1)
                break;
        }
    if(n!=1)
        p=n-1;
    p--;
    d=1;
    while(p)
    {
        if(p%2==1)
            d=(d*a)%nr;
        a=(a*a)%nr;
        p/=2;
    }
    printf("%d\n",d);
    return 0;
}