I have a question about the java combination.

public static void main(String[] args) {
    // // TODO Auto-generated method stub

    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();

    int[] s = new int[n];
    int[] bucket = new int[n/2];

    for(int i = 0; i < s.length; i++)
        s[i] = sc.nextInt();

   pick(s, n, bucket, n/2, n/2);
}
public static void pick(int[] item, int itemSize, int[] bucket, int bucketSize, int k)
{// combination

    int i, total = 0, sum = 0;
    int smallest, lastIndex, min = 999999;

    for(i = 0; i < itemSize; i++) {
        total += item[i];
    }

    if ( k == 0 ) // trivial case
    {
        int team = 0;
        for(i = 0; i < bucketSize; i++) {
            System.out.printf("%s ", item[bucket[i]]);
            sum += item[bucket[i]];
        }
        System.out.println(sum);
        return;
    }
    lastIndex = bucketSize - k - 1;

    if(bucketSize == k)
        smallest = 0;
    else
        smallest = bucket[lastIndex]+1;

    for(i = smallest; i < itemSize; i++)
    {
        bucket[lastIndex+1] = i;
        pick( item, itemSize, bucket, bucketSize, k-1 );
    }
}'''