DouaNumereCuSumaK

import java.util.*;
public class NumbersWithSumK {
    public void findPair(int [] arr, int sum){

        Hashtable hashtable = new Hashtable();
        for( int i = 0; i< arr.length -1; i++){
            hashtable.put(i, arr[i]);
        }
        for(int i = 0; i <= arr.length - 1; i++){
            int element = sum - arr[i];
            if ( element.hashCode() == i) {
                System.out.println(" pair " + i + " , "  );
            }
        }
    }
}