package aima.core.environment.nqueens;
import aima.core.search.framework.HeuristicFunction;
/**
* Estimates the distance to goal by the number of attacking pairs of queens on
* the board.
*
* @author R. Lunde
*/
public class AttackingPairsHeuristic implements HeuristicFunction {
public double h(Object state) {
NQueensBoard board = (NQueensBoard) state;
return board.getNumberOfAttackingPairs();
}
}