Cod sursa(job #645390)
Utilizator | Data | 9 decembrie 2011 15:20:43 | |
---|---|---|---|
Problema | Invers modular | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.41 kb |
#include <fstream>
using namespace std;
ifstream fi ("inversmodular.in");
ofstream fo ("inversmodular.out");
int A, N, X, Y;
void euclid (int a, int b)
{
if (b == 0)
{
X = 1;
Y = 0;
}
else
{
euclid (b, a % b);
int x = X, y = Y;
X = y;
Y = x - (a / b) * y;
}
}
int main ()
{
fi >> A >> N;
euclid (A, N);
if (X < 0) X = X % N + N;
fo << X << '\n';
return 0;
}