/*
 * 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.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;

/**
 * ´ÓÎÄ±¾¶ÁÈ¡ÊäÈë
 * @author Administrator
 *
 */
public class InOutTool extends ArrayList<String> {
	private String inPath ;
	private String outPath;
	public String outText(String path){
		this.outPath = path;
		return outText();
	}
	public String outText(){
		StringBuffer sb = new StringBuffer();
		PrintWriter out = null;
		try {
			out = new PrintWriter(new File(outPath).getAbsoluteFile());
			for(String s:this){
				out.println(s);
				sb.append(s);sb.append("\n");
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(null!=out){
				out.close();
			}
		}
		return sb.toString();
	}
	public String readText(String inPath){
		StringBuffer sb = new StringBuffer();
		BufferedReader in = null;
		try {
			in = new BufferedReader(new FileReader(new File(inPath).getAbsoluteFile()));
			String s;
			while((s = in.readLine()) != null){
				s = s.trim();
				add(s);//Ã¿Ò»ÐÐ×÷ÎªArrayListµÄÒ»¸öÔªËØ
				sb.append(s);sb.append("\n");
			}
		}catch (FileNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(null!=in){
				try {
					in.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		return sb.toString();
	}
	public InOutTool(String inPath,String outPath){
		this.inPath = inPath;this.outPath = outPath;
		readText(inPath);
		if((size()!=0)&&get(0).equals("")) remove(0);
	}
}
