import java.lang.*;
import java.util.*;

public class TwoThreeState extends TraversableState implements Heuristic {

   int stateValue;

   public TwoThreeState() {
       stateValue = 0;
   }

   public State applyOperator(String op) {

       TwoThreeState nextState = new TwoThreeState();

       if (op.equals("add2")) {
           nextState.stateValue= stateValue+2;
       } else if (op.equals("add3")) {
           nextState.stateValue= stateValue+3;
       } 
        
       return nextState;

   }

   public float costOf(String op) {
       if (op.equals("add2")) {
          return 2;
       } else {
          return (float) 4;
       }
   }

   public ArrayList<String> validOperators() {
       ArrayList<String> opList = new ArrayList<String>();
       
       opList.add("add3");
       opList.add("add2");

       return opList; 
   }
    
   public boolean isGoal() {
       return (stateValue > 0 && stateValue%23==0) ;
   }

   public float h() {
       float hVal = 23 - stateValue; 
       if (hVal<0) return 0;
       else return hVal;
   }

   public String toString() {
       return "(" + stateValue + ")";
   }
}