/*
 * 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 mgg.utils;

import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

/**
 * @author manolo
 * @date 13/04/12
 */
public class StringUtils {

	public static List<Integer> stringWithIntegersToList(String str, int numItems, String delim){

		ArrayList<Integer> list = new ArrayList<Integer>();
		StringTokenizer tokenizer = new StringTokenizer(str, delim);
		if (tokenizer.countTokens() != numItems){
			throw new RuntimeException("EXCEPTION: The string \"" + str 
					+ "\" has more tokens (" + tokenizer.countTokens()
					+ ") than you said (" + numItems + ")");
		}
		for	(int i = 0; i < numItems; i++) {
			list.add(Integer.parseInt(tokenizer.nextToken()));
		}

		return list;
	}
	
	public static List<Integer> stringWithIntegersToList(String str, String delim){

		ArrayList<Integer> list = new ArrayList<Integer>();
		StringTokenizer tokenizer = new StringTokenizer(str, delim);
		int numOfTokens = tokenizer.countTokens();
		for	(int i = 0; i < numOfTokens; i++) {
			list.add(Integer.parseInt(tokenizer.nextToken()));
		}

		return list;
	}

	public static List<String> stringWithStringsToList(String str, int numItems, String delim){

		ArrayList<String> list = new ArrayList<String>();
		StringTokenizer tokenizer = new StringTokenizer(str, delim);
		if (tokenizer.countTokens() != numItems){
			throw new RuntimeException("EXCEPTION: The string \"" + str 
					+ "\" has more tokens (" + tokenizer.countTokens()
					+ ") than you said (" + numItems + ")");
		}
		for	(int i = 0; i < numItems; i++) {
			list.add(tokenizer.nextToken());
		}

		return list;
	}
	
	public static List<String> stringWithStringsToList(String str, String delim){

		//System.out.println("String: " + str);
		
		ArrayList<String> list = new ArrayList<String>();
		StringTokenizer tokenizer = new StringTokenizer(str, delim);
		
		//System.out.println("tokenizer.countTokens() = " + tokenizer.countTokens());
		
		int numOfTokens = tokenizer.countTokens();
		for	(int i = 0; i < numOfTokens; i++) {
			list.add(tokenizer.nextToken());
		}

		return list;
	}

	public static List<Character> allCharactersToList(String str) {
		
		System.out.println("String: " + str);
		
		ArrayList<Character> list = new ArrayList<Character>();
		
		for	(int i = 0; i < str.length(); i++) {
			list.add(str.charAt(i));
		}

		System.out.println("List of characters: " + list);
		
		return list;
	}
}
