Cod sursa(job #2181564)
Utilizator | Data | 21 martie 2018 18:57:58 | |
---|---|---|---|
Problema | Ridicare la putere in timp logaritmic | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.46 kb |
#include <iostream>
#include <fstream>
using namespace std;
int exponent(int x,int n)
{
if(n<0) return exponent(x,n*(-1));
else if(n==0) return 1;
else if(n==1) return x;
else if(n%2==0) return exponent(x*x,n/2);
else if(n%2!=0) return x*exponent(x*x,(n-1)/2);
}
int main()
{
int x,n;
ifstream f("lgput.in");
ofstream o("lgput.out");
f>>x>>n;
exponent(x,n);
o<<exponent(x,n);
return 0;
}