Cod sursa(job #2144585)

Utilizator NannyiMaslinca Alecsandru Mihai Nannyi Data 26 februarie 2018 20:20:14
Problema Ridicare la putere in timp logaritmic Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.6 kb
#include <iostream>
#include <fstream>
using namespace std;

ifstream f("lgput.in");
ofstream g("lgput.out");

#define modulo 1999999973

long long x,p,tobemultiplied=1;

int main()
{
    f>>x>>p;
    for (;p>1;)
    {
        bool paritate=p&1;
        if (paritate)
        {
            tobemultiplied*=x;
            tobemultiplied%=modulo;
            x*=x;
            x%=modulo;
            p=(p-1)/2;
        }
        else
        {
            x*=x;
            x%=modulo;
            p/=2;
        }
    }
    g<<(x%modulo*tobemultiplied%modulo)%modulo;
    return 0;
}