/*
 * 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 com.google.codejam.recycle;

import java.util.List;

/**
 * Created by IntelliJ IDEA.
 * User: sushant
 * Date: 14 Apr, 2012
 * Time: 11:13:34 AM
 * To change this template use File | Settings | File Templates.
 */
public class RecycledNumbers {
    /**
     * Main method from where application start execution.
     *
     * @param args String []
     */
    public static void main(final String[] args) {
        if (args.length != 1)  {
            System.out.println("Problem with the command used for execution");
            System.out.println("Usage: java com.google.codejam.googlerese.RecycledNmbers <Path to input file>");
            System.exit(1);
        }

        final List<TestCase> testCases = InputReader.prepareTestCases(args[0]);
        if (testCases != null && testCases.size() != 0)  {
            long startTime = System.currentTimeMillis();
            System.out.println("Test Cases execution start time " + startTime);
            for (TestCase testcase : testCases) {
                executeTestCase(testcase);
            }
            OutputRecorder.generateTestReport(testCases, args[0] + ".out");
            long endTime = System.currentTimeMillis();
            System.out.print("Test cases execution end time " + endTime);
            System.out.println("Total Execution Time " + (endTime - startTime) + " milliseconds");
        }

    }

    /**
     * Method to execute test cases.
     *
     * @param testcase     TestCase
     */
    private static void executeTestCase(final TestCase testcase) {
        int recycleNumberCount = 0;
        final int low = testcase.getLow();
        final int high = testcase.getHigh();
        final int length = Integer.toString(low).length();
        for(int i = low; i <= high; i++) {
            int previoudNumber = 0;
            for(int j = 1; j < length; j++) {
                int divisor = getDivisor(length - j);
                int mod = i % divisor;
                int result = i / divisor;
                int recycleNumber = Integer.parseInt("" + mod + result);
                if(previoudNumber != recycleNumber && recycleNumber > i && recycleNumber <= high) {
                      previoudNumber = recycleNumber;
                    recycleNumberCount =  recycleNumberCount + 1;
                }
            }
        }
        testcase.setOutput(new TestResult(recycleNumberCount));
    }

    private static int getDivisor(int noOfZeros) {
        StringBuilder builder = new StringBuilder().append(1);
        for(int i = 0; i < noOfZeros; i++) {
            builder.append(0);
        }
        return Integer.parseInt(builder.toString());
    }
}


