/*
 * 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 recyclednumbers;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;


public class SimpleWriter {
	private BufferedWriter bw;
	private int line;
	
	public SimpleWriter() {
		String filename = prompt();
		setWriter(filename);
	}
	
	public SimpleWriter(String filename) {
		setWriter(filename);
	}
	
	private String prompt() {
		System.out.println("Output file: ");
		BufferedReader bufr = new BufferedReader(
				new InputStreamReader(System.in));
		String filename = null;
		try {
			filename = bufr.readLine();
		} catch (IOException e) {
			System.err.println("At prompt: " + e.getMessage());
		}
		return filename;
	}
	
	private void setWriter(String filename) {
		try {
			bw = new BufferedWriter(new FileWriter(filename));
		} catch (IOException e) {
			System.err.println(e.getMessage());
		}
	}
	
	public void writeLine(String str) {
		try {
			line++;
			bw.write(str + "\n");
		} catch (IOException e) {
			System.err.println("Line " + (line - 1) + ": " + e.getMessage());
		}
	}
	
	public void writeLine(int i) {
		writeLine(i + "");
	}
	
	public void writeLine(int[] arr) {
		String line = "";
		for (int i : arr) {
			line = line + i + " ";
		}
		line = line.trim();
		writeLine(line);
	}
	
	public void flush() {
		try {
			bw.flush();
		} catch (IOException e) {
			System.err.println("At flush: " + e.getMessage());
		}
	}
}
