11388 - GCD LCM/p11388.cpp

   1 #include <iostream>
   2
   3 using namespace std;
   4
   5 int main(){
   6   int t;
   7   cin >> t;
   8   while(t--){
   9   unsigned int g,l;
  10   cin >> g >> l;
  11   if (g > l || l % g != 0)
  12     cout << "-1\n";
  13   else
  14     cout << g << " " << l << "\n";
  15   }
  16 }