Cod sursa(job #2639859)

Utilizator Catalin007Botezat Catalin Catalin007 Data 4 august 2020 12:35:07
Problema Invers modular Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.61 kb
#include <bits/stdc++.h>
#define ll long long

using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
ll A, N, mod;
ll phi(ll n){
    ll ans=n;
for(ll i=2;i*i<=n;i++){
    if(n%i==0)
        {
            ans=ans/i*(i-1);
            while(n%i==0) n/=i;
        }
}
if(n!=1)
    ans=ans/n*(n-1);
return ans;
}
ll put(ll n, ll p){
ll ans=1;
while(p>0){
    if(p%2==1)
        ans=(ans*n)%mod;
      n=(n*n)%mod;
    p/=2;
}
return ans;
}
int main()
{
    fin>>A>>N;
    mod=N;
    ll p=phi(N)-1;
     ll sol=1;


    fout<<put(A,p);
    return 0;
}