/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package recyclednumbers;

import java.util.HashSet;

/**
 *
 * @author vandit
 */
public class RecycleNumbers {

    private HashSet<String> numbers = new HashSet<String>();
    private HashSet<String> initialTempNumbers = new HashSet<String>();
    private HashSet<String> finalTempNumbers = new HashSet<String>();

    HashSet<Pair> numberPairs = new HashSet<Pair>();


    private void findRecycledNumbers(int start, int end, int places) {


        for (int i = start; i <= end; i++) {
            String initialNumber = Integer.toString(i);
            //if (!(numbers.contains(initialNumber) || finalTempNumbers.contains(initialNumber))) {

                StringBuffer tempNumber = new StringBuffer(initialNumber);
                int len = tempNumber.length();
                int startIndexToMove = len - places;
                String tempString = tempNumber.substring(startIndexToMove);
                if ((places == 1 && tempString.equals("0")) || tempString.charAt(0) == '0') {
                    continue;
                }
                tempNumber.delete(startIndexToMove, len);
                String finalTempNumber = tempString + tempNumber.toString();

                if (! (finalTempNumber.equals(initialNumber) || Integer.parseInt(finalTempNumber) > end || Integer.parseInt(finalTempNumber) < Integer.parseInt(initialNumber))) {
                    numbers.add(initialNumber);
                    finalTempNumbers.add(finalTempNumber);
                    Pair pair = new Pair(finalTempNumber,initialNumber);
                    numberPairs.add(pair);
                }
            }

        

    }

    public HashSet<Pair> findAllRecycledNumbers(int start, int end) {
        int length = Integer.toString(start).length();
        for (int i = 1; i < length; i++) {
            findRecycledNumbers(start, end, i);
        }
        return numberPairs;
    }
}

package tr0llhoehle.cakemix.utility.googleCodeJam;

import java.text.ParseException;

/**
 * This class is a base class for all concrete problems. It is used to define
 * some methods necessary for the IOManager to work. It is crucial that the
 * addValue-Method gets extended and called (super.addValue(o)) by the extending
 * class.
 * 
 * @author Cakemix
 * @see IOManager
 * @see Solver
 */
public abstract class Problem {

    protected SupportedTypes[] types;
    protected int cntr = 0;
    protected boolean isInitialised = false;

    /**
     * Returns an array of SupportedTypes which define exactly what data is
     * stored in this problem.
     * 
     * The attribute "types" needs to be initialized in the constructor of the
     * extending class.
     * 
     * @return An array of SupportedTypes which define exactly what data is
     *         stored in this problem.
     * @see SupportedTypes
     */
    public SupportedTypes[] getTypes() {
	return types;
    }

    public void addValue(Object o) throws ParseException {
	if (!isInitialised) {
	    cntr++;
	    isInitialised = (cntr == types.length);
	} else {
	    throw new ParseException("Tried to add another value to this Problem even though all values are set.", cntr);
	}
    }
}
