Cod sursa(job #657212)
Utilizator | Data | 5 ianuarie 2012 23:03:45 | |
---|---|---|---|
Problema | Invers modular | Scor | 50 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.49 kb |
#include <fstream>
using namespace std;
int A, N, x, y;
void euclid(int a, int b)
{
if (b == 0)
{
x = 1;
y = 0;
return ;
}
euclid(b, a % b);
int dx = x, dy = y;
x = dy;
y = dx + (a / b) * dy;
}
int main()
{
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
f >> A >> N;
euclid(A, N);
x %= N;
if (x < 0)
x = x + N;
g << x << '\n';
g.close();
return 0;
}