The solution comparator compares two solutions: the current solution and the
best solution found. This comparison can be based on several criteria. For
example, it can lexicographically order solutions according to the number of
unassigned variables (smaller number is better) and the number of violated
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 3 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.