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Cod sursa(job #666973)
#include<fstream>
using namespace std;
unsigned long long a,n,x,y;
inline void euclid(unsigned long long a, unsigned long long b, unsigned long long &x,unsigned long long &y)
{
if(b==0)
{
x=1;
y=0;
}
else
{ unsigned long long aux;
euclid(b,a%b,x,y);
aux=x;
x=y;
y=aux-(a/b)*y;
}
}
int main()
{
freopen("inversmodular.in","r",stdin);
freopen("inversmodular.out","w",stdout);
scanf("%lld %lld",&a,&n);
euclid(a,n,x,y);
while(x<0)
x=n+x%n;
printf("%lld",x);
return 0;
}