10812 - Beat the spread/10812.cpp

   1 #include <iostream>
   2
   3 using namespace std;
   4
   5 int main(){
   6   int n;
   7   cin >> n;
   8   while (n--){
   9     unsigned long long s,d,x,y;
  10     cin >> s >> d;
  11     if (s < d || (s+d)%2 != 0 || (s-d)%2 != 0){
  12       cout << "impossible" << endl;
  13     }else{
  14       cout << (s+d)/2 << " " << (s-d)/2 << endl;
  15     }
  16   }
  17   return 0;
  18 }