Cod sursa(job #1730670)

Utilizator Andrei_PopaAndreiCDG Andrei_Popa Data 17 iulie 2016 13:45:40
Problema Ridicare la putere in timp logaritmic Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.75 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("lgput.in");
ofstream g("lgput.out");

long long exp_by_squaring(long long x,int n)
{
    if(n<0)
    return exp_by_squaring(1/x,-n);
    else
    {
        if(n==0)
        return 1;
        else
        {
            if(n==1)
            return x%1999999973;
            else
            {
                if(n%2==0)
                return (exp_by_squaring((x*x)%1999999973,n/2))%1999999973;
                else
                return (x*exp_by_squaring((x*x)%1999999973,(n-1)/2))%1999999973;

            }
        }
    }
}

int main()
{

    int a,b;
    f>>a>>b;
    g<<exp_by_squaring(a,b)%1999999973;

    f.close();
    g.close();
    return 0;
}