Cod sursa(job #1048643)
Utilizator | Gabriel Marghescu Marghescu | Data | 6 decembrie 2013 10:33:18 |
---|---|---|---|
Problema | Invers modular | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.47 kb |
#include <fstream>
#define ll long long
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,n;
void ex(int a,int b,ll &x,ll &y)
{
if(b==0)
{
x=1;
y=0;
return;
}
ex(b,a%b,x,y);
ll x0=x;
x=y;
y=x0-(a/b)*y;
return;
}
int main()
{
f>>a>>n;
ll w=0,z;
ex(a,n,w,z);
if (w<=0)
w=n+w%n;
g<<w;
f.close();
g.close();
return 0;
}