/*
 * 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 codejam;

import java.io.*;
import java.util.Scanner;


public final class ReadWriteTextFile {


  
  /** Constructor. */
  ReadWriteTextFile(){
        try {
                out =new BufferedWriter(new FileWriter("output.in"));
            
                
              scanner = new Scanner(new FileInputStream("input.in"));
              

        } catch (FileNotFoundException ex) {
                  }catch (IOException ex) {
                
            }
  
      
  }
  
  /** Write fixed content to the given file. */
  void writeNextLine(int text)   {
        try {
            out.write("Case #"+lineNumber +": "+text+"\r\n");
  
            System.out.println("Case #"+lineNumber +": "+text);
            
        } catch (IOException ex) {
            
                 }
    
   lineNumber++;
  }
  
   String readLine()  {
    
       
       String output = scanner.nextLine();
      
    return output;
    
  }
   int readIntLine(){
    
    String output = scanner.nextLine();  
       return Integer.decode(output).intValue();
   }
   int readInt(){
    
       return scanner.nextInt();
   }
   
   public void close()
   {
        try {
            out.close();
        } catch (IOException ex) {
              }
   scanner.close();
   }
  // PRIVATE 
  private int lineNumber = 1;
  private BufferedWriter out = null;
  private Scanner scanner = null;
  
}