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Dec 7th, 2019
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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define lli long long int
  5. #define pb push_back
  6.  
  7. int main()
  8. {
  9. int q , a , b , c , d;
  10. cin >> q ;
  11.  
  12. while (q--)
  13. {
  14. vector <int> v ;
  15. cin >> a >> b >> c >> d ;
  16. v.pb(a);
  17. v.pb(b);
  18. v.pb(c);
  19. v.pb(d);
  20.  
  21. sort(v.begin(), v.end());
  22.  
  23. if ((v[3] - v[2]) % 2 != 0)
  24. {
  25. if (__gcd(v[3] , v[2]) != 1)
  26. {
  27. cout << v[3] * (v[3] - v[2]) << endl ;
  28. }
  29. else
  30. {
  31. cout << v[3] * v[2] << endl ;
  32. }
  33. }
  34. else
  35. {
  36. cout << v[0] * v[3] << endl ;
  37. }
  38. }
  39.  
  40. return 0;
  41. }
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