Cod sursa(job #2021564)

Utilizator ioana_marinescuMarinescu Ioana ioana_marinescu Data 13 septembrie 2017 22:32:38
Problema Ridicare la putere in timp logaritmic Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.5 kb
#include <bits/stdc++.h>

using namespace std;

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

long long putere(int a, int n, int p)
{
    long long x;
    if(n==0)
        return 1;
    else
        if(n%2==1)
    {
        x=putere(a, n-1, p);
        return ((x%p)*(a%p))%p;
    }
    else
    {
        x=putere(a, n/2, p);
        return ((x%p)*(x%p))%p;
    }
}
int main()
{
    int a, n, p=1999999973;
    fin>>a>>n;
    fout<<putere(a, n, p);
    return 0;

}