/*
 * 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 info.m3o.gcj2012.recyclednumber;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class InputFileLoader {


	protected File infile;

	protected List<String> rawInputLines;

    public List<String> getRawInputLines() {
        if (rawInputLines == null) {
        	rawInputLines = new ArrayList<String>();
        }
        return this.rawInputLines;
    }



	InputFileLoader(String infilepath) {
		infile = new File(infilepath);
		assert infile.canRead() == true : "File " + infilepath
				+ " is not readable.";
	}


	public void readInputFile() {
		assert infile != null : "Infile is null.";
		assert infile.canRead() == true;
		
		FileReader fr;
		BufferedReader br;
		String str;
		if (infile.canRead()) {
			try {
				fr = new FileReader(infile);
				br = new BufferedReader(fr);
				str = br.readLine();
				while (str != null) {
					this.getRawInputLines().add(str);
					str = br.readLine();
				}
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				return;
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				return;
			}
		}
	}

}
