Cod sursa(job #2325528)
Utilizator | Hedea Mihnea HedeaMihneA | Data | 22 ianuarie 2019 18:39:08 |
---|---|---|---|
Problema | Invers modular | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.52 kb |
#include <fstream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
long long n, a, x, y;
long long cmmdc(long long a, long long b, long long &x, long long &y) {
if (b == 0) {
x = 1;
y = 0;
return a;
} else {
long long xa, ya;
long long r = cmmdc(b, a%b, xa, ya);
x = ya;
y = xa - ya*(a/b);
return r;
}
}
int main() {
fin>>a>>n;
cmmdc(a, n, x, y);
fout<<(x%n+n)%n;
}