/*
 * 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 jp.funnything.competition.util;

import java.util.Comparator;

import com.google.common.base.Objects;

public class Pair< T1 , T2 > {
    public static < T1 extends Comparable< T1 > , T2 extends Comparable< T2 > > Comparator< Pair< T1 , T2 > > getFirstComarator() {
        return new Comparator< Pair< T1 , T2 > >() {
            @Override
            public int compare( final Pair< T1 , T2 > o1 , final Pair< T1 , T2 > o2 ) {
                final int c = o1.first.compareTo( o2.first );
                return c != 0 ? c : o1.second.compareTo( o2.second );
            }
        };
    }

    public static < T1 extends Comparable< T1 > , T2 extends Comparable< T2 > > Comparator< Pair< T1 , T2 > > getSecondComarator() {
        return new Comparator< Pair< T1 , T2 > >() {
            @Override
            public int compare( final Pair< T1 , T2 > o1 , final Pair< T1 , T2 > o2 ) {
                final int c = o1.second.compareTo( o2.second );
                return c != 0 ? c : o1.first.compareTo( o2.first );
            }
        };
    }

    public T1 first;
    public T2 second;

    public Pair( final Pair< T1 , T2 > that ) {
        this.first = that.first;
        this.second = that.second;
    }

    public Pair( final T1 first , final T2 second ) {
        this.first = first;
        this.second = second;
    }

    @Override
    public boolean equals( final Object obj ) {
        if ( this == obj ) {
            return true;
        }

        if ( obj == null || getClass() != obj.getClass() ) {
            return false;
        }

        final Pair< ? , ? > that = ( Pair< ? , ? > ) obj;

        return Objects.equal( this.first , that.first ) && Objects.equal( this.first , that.first );
    }

    @Override
    public int hashCode() {
        final int prime = 31;

        int result = 1;
        result = prime * result + ( first == null ? 0 : first.hashCode() );
        result = prime * result + ( second == null ? 0 : second.hashCode() );

        return result;
    }

    @Override
    public String toString() {
        return "Pair [first=" + first + ", second=" + second + "]";
    }
}
