Cod sursa(job #1507568)

Utilizator codi22FMI Condrea Florin codi22 Data 21 octombrie 2015 19:06:12
Problema Ridicare la putere in timp logaritmic Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 0.51 kb
#include <iostream>
#include <cstdio>
using namespace std;
int x,p1,p,V[100000],k,i;
int main()
{
   // std::ios::sync_with_stdio(false);
    freopen("lgput.in","r",stdin);
    freopen("lgput.out","w",stdout);
    cin>>x>>p;
    V[1]=x;
    V[0]=1;
    p1=1;
    while (p>=(p1<<1))
    {
        x=x*x;
        p1<<=1;
        k++;
        V[k]=x;
    }
    for (i=k;i>0&&p1<p;i--)
    {
        if ((p1+1<<i)<p)
        {
            x*=V[i];
            p1+=1<<k;
        }
    }
    cout<<x;
}