Cod sursa(job #2460135)

Utilizator Catalin2002Catalin Craciun Catalin2002 Data 22 septembrie 2019 20:36:20
Problema Ridicare la putere in timp logaritmic Scor 80
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.67 kb
#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("lgput.in");
ofstream fout("lgput.out");

const long long modul=1999999973;

long long ridicare_putere(long long a, long long n)
{
    long long x;

    if(n==1)
    {
        return a%modul;
    }

    if(n==2)
        return (a%modul)*(a%modul);

    if(n%2==0)
    {
        x=ridicare_putere(a,n/2)%modul;
        return (x*x)%modul;
    }
    else
    {
        x=ridicare_putere(a,n-1)%modul;
        return x%modul*a;
    }



}

int main()
{
    long long a,n,i,s;

    fin>>a>>n;


    //fout<<s;


    fout<<ridicare_putere(a%modul,n);

    return 0;
}