Ilya.Rudyak

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of 17 vote

public class KSmallest2 {

    private MinPQ<Integer> minHeap;
    private int x;
    private int k;
    private int count = 0;

    public KSmallest2(String filename, int x, int k) {
        this.x = x;
        this.k = k;
        minHeap = new MinPQ<>();
        try {
            Scanner in = new Scanner(new File(filename));
            while (in.hasNext()) {
                minHeap.insert(in.nextInt());
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    public boolean check(int index) {

        if (index > minHeap.size()) {
            return false;
        }

        if (minHeap.getByIndex(index) < x) {
            count++;
            if (count >= k) {
                return true;
            }

            return  check(2 * index) ||
                    check(2 * index + 1);
        }

        return false;
    }



    public static void main(String[] args) {
        KSmallest2 ks = new KSmallest2("src/main/resources/minheap.txt", 18, 5);
        System.out.println(ks.minHeap);

        System.out.println(ks.check(1));
    }
}

- Ilya.Rudyak June 06, 2016 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 vote

public void buildMaxHeap() {
        maxPQ = Arrays.copyOf(pq, pq.length);
        for (int k = N/2; k >= 1; k--) {
            sinkMax(k);
        }
    }

    // helper functions
    private void sinkMax(int k) {
        while (2*k <= N) {
            int j = 2*k;
            if (j < N && less(j, j+1)) j++;
            if (!less(k, j)) break;
            exchMax(k, j);
            k = j;
        }
    }
    private boolean less(int i, int j) {
        if (comparator == null) {
            return ((Comparable<Key>) maxPQ[i]).compareTo(maxPQ[j]) < 0;
        }
        else {
            return comparator.compare(maxPQ[i], maxPQ[j]) < 0;
        }
    }
    private void exchMax(int i, int j) {
        Key swap = maxPQ[i];
        maxPQ[i] = maxPQ[j];
        maxPQ[j] = swap;
    }

- Ilya.Rudyak June 06, 2016 | Flag Reply

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