/*
 * 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;
    }
}

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

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;

/**
 *
 * @author strigazi
 */
public class TextFile implements Iterable<String> {

  // Used by the TextFileIterator class below
  final String filename;

  public TextFile(String filename) { 
    this.filename = filename; 
  }

  // This is the one method of the Iterable interface
  public Iterator<String> iterator() { 
    return new TextFile.TextFileIterator(); 
  }


  // This non-static member class is the iterator implementation
  class TextFileIterator implements Iterator<String> {

    // The stream we're reading from
    BufferedReader in;

    // Return value of next call to next()
    String nextline;

    public TextFileIterator() {
      // Open the file and read and remember the first line.
      // We peek ahead like this for the benefit of hasNext().
      try {
        in = new BufferedReader(new FileReader(filename));
        nextline = in.readLine();
      } catch(IOException e) { 
        throw new IllegalArgumentException(e); 
      }
    }

    // If the next line is non-null, then we have a next line
    public boolean hasNext() { 
      return nextline != null; 
    }

    // Return the next line, but first read the line that follows it.
    public String next() {
      try {
        String result = nextline;

        // If we haven't reached EOF yet
        if (nextline != null) {  
          nextline = in.readLine(); // Read another line
          if (nextline == null) 
            in.close();             // And close on EOF
        }

        // Return the line we read last time through.
        return result;
      } catch(IOException e) { 
        throw new IllegalArgumentException(e); 
      }
    }

    // The file is read-only; we don't allow lines to be removed.
    public void remove() { 
      throw new UnsupportedOperationException(); 
    }
  }
}
