Cod sursa(job #478553)
Utilizator | Data | 19 august 2010 09:39:50 | |
---|---|---|---|
Problema | Ridicare la putere in timp logaritmic | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.44 kb |
#include <cstdio>
#include <cstdlib>
#define MODNR 1999999973
FILE *fin=fopen("lgput.in","r");
FILE *fout=fopen("lgput.out","w");
int put(int a, int b)
{
int p=1;
for (int i=(sizeof(int)*8-2); i>=0; i--)
{
p=(p*p)%MODNR;
if (b&(1<<i))
p=(p*a)%MODNR;
}
return p;
}
int main (int argc, char * const argv[]) {
int a,b;
fscanf(fin, "%d %d", &a, &b);
fprintf(fout, "%d\n", put(a,b));
fclose(fin);
fclose(fout);
return 0;
}