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Cod sursa(job #459008)
#include <fstream>
using namespace std;
ifstream in("inversmodular.in");
ofstream out("inversmodular.out");
void ex(int a,int b,int &x, int &y)
{
if(!b)
{
x=1;
y=0;
}
else
{
int x0,y0;
ex(b,a%b,x0,y0);
x=y0;
y = x0 -(a/b)*y0;
}
}
int main ()
{
int a,b;
in>>a>>b;
int x,y;
ex(a,b,x,y);
if(x<0)
x+=b;
out<<x;
return 0;
}