Cod sursa(job #2590535)

Utilizator Marius7122FMI Ciltea Marian Marius7122 Data 28 martie 2020 12:45:13
Problema Ridicare la putere in timp logaritmic Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.68 kb
#include <iostream>
#include <fstream>

using namespace std;

const int mod = 1999999973;

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

long long putere(long long n, long long p)
{
    // 00101001
    //     1000

    long long sol = 1;
    long long baza = n;
    long long exponent = 1;

    while(exponent <= p)
    {
        // apare exponent in descompunerea binara a puterii
        if(p & exponent)
        {
            sol *= baza;
            sol %= mod;
        }

        baza = baza * baza;
        exponent *= 2;
    }

    return sol;
}

int main()
{
    long long n, p;
    fin >> n >> p;

    fout << putere(n, p);

    return 0;
}