/*
 * 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;
    }
}

/**
 * Google CodeJam 2012
 * Qualification round - Problem C
 * Recycled Numbers
 * 
 * Solved by Üllar Soon <positivew@gmail.com>
 */
package eu.positivew.codejam.recycled;


/**
 * Recycled Numbers integer pair (m, n).
 * 
 * @author Üllar Soon <positivew@gmail.com>
 */
public class IntPair {
	
	private int n, m;
	
	public IntPair(int n, int m) {
		this.n = n;
		this.m = m;
	}

	public int getN() {
		return n;
	}

	public void setN(int n) {
		this.n = n;
	}

	public int getM() {
		return m;
	}

	public void setM(int m) {
		this.m = m;
	}
	
	@Override
	public boolean equals(Object o) {
		IntPair compTo = (IntPair)o;
		
		if(n == compTo.getN() && m == compTo.getM())
			return true;
		else
			return false;
	}

}
