Cod sursa(job #1449211)
Utilizator | Data | 8 iunie 2015 23:03:36 | |
---|---|---|---|
Problema | Ridicare la putere in timp logaritmic | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.43 kb |
#include <fstream>
using namespace std;
ifstream f("lgput.in");
ofstream g("lgput.out");
int p(long long x,int n)
{
if(n<0)
return p(1/x,-n);
else if(n==0)
return 1;
else if(n==1)
return x;
else if(n%2==0)
return p(x*x,n/2);
else if(n%2==1)
return x*p(x*x,(n-1)/2);
}
int main()
{
long long a;
int b;
f>>a>>b;
g<<p(a,b);
return 0;
}