/*
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 * 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 MyAllgoritmicLib;

public class Sort {
	public static int partition(int[] m, int a, int b) {
		int i = a;
		for (int j = a; j <= b; j++) // ïðîñìàòðèâàåì ñ a ïî b
		{
			if (m[j] >= m[b]) // åñëè ýëåìåíò a[j] íå ïðåâîñõîäèò
			// a[b],
			{
				int t = m[i]; // ìåíÿåì ìåñòàìè a[j] è a[a], a[a+1], a[a+2] è
				// òàê äàëåå...
				m[i] = m[j]; // òî åñòü ïåðåíîñèì ýëåìåíòû ìåíüøèå a[b] â
				// íà÷àëî,
				m[j] = t; // à çàòåì è ñàì a[b] «ñâåðõó»
				i++; // òàêèì îáðàçîì ïîñëåäíèé îáìåí: a[b] è a[i], ïîñëå ÷åãî
				// i++
			}
		}
		return i - 1; // â èíäåêñå i õðàíèòñÿ <íîâàÿ ïîçèöèÿ ýëåìåíòà a[b]> + 1
	}

	public static void quicksort(int[] m, int a, int b) // a - íà÷àëî ïîäìíîæåñòâà,
	// b -
	// êîíåö
	{ // äëÿ ïåðâîãî âûçîâà: a = 0, b = <ýëåìåíòîâ â ìàññèâå> - 1
		if (a >= b)
			return;
		int c = partition(m, a, b);
		quicksort(m, a, c - 1);
		quicksort(m, c + 1, b);
	}
}
