/*
 * 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.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class RecycledNumbers {
	public static void main(String[] args) {
		File inFile = new File(
				"C:\\Users\\Stef\\workspace\\Google Code Jam\\src\\recycledNumbers\\small.in");
		FileInputStream fis = null;
		Scanner in = null;

		FileWriter outFile;
		try {
			outFile = new FileWriter(
					"C:\\Users\\Stef\\workspace\\Google Code Jam\\src\\recycledNumbers\\small.out");
			BufferedWriter out = new BufferedWriter(outFile);

			try {
				fis = new FileInputStream(inFile);

				in = new Scanner(fis);
				int cases, a, b, no;
				cases = in.nextInt();

				for (int i = 0; i < cases; i++) {
					no=0;
					a=in.nextInt();
					b=in.nextInt();
					
					for (int k=a;k<=b-1;k++)
						for (int j=k+1;j<=b;j++) {
							if (recycled(k,j))
								no++;
						}
					out.write("Case #" + (i + 1) + ": " +no+ "\n");
				}

				fis.close();
				in.close();

			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}

			out.close();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
	}

	private static boolean recycled(int k, int j) {
		int digits=0;
		int kc=k;
		int last;
		int multiply=1;
		while (kc>0) {
			digits++;
			multiply*=10;
			kc/=10;
		}
		multiply/=10;
		for (int i=0;i<digits;i++) {
			last=k%10;
			k/=10;
			k+=last*multiply;
			if (k==j)
				return true;
		}
		return false;
	}
}
