Method pairs

Hackerank/Java/Pairs.java:12–28

(int k, int[] arr)

    // Complete the pairs function below.
    static int pairs(int k, int[] arr) {
        HashSet <Integer> set = new HashSet<Integer>();
        int count = 0;
        for(int i=0;i<arr.length;i++)
        {
            set.add(arr[i]);
        }
        //System.out.println(set);
        for(int i=0;i<arr.length;i++)
        {   
            if(set.contains(arr[i]+k))
            {
                count++;
            }
        }
        return count;
    }

    private static final Scanner scanner = new Scanner(System.in);