}

// splitKeys divides the array of keys into 2 so they can update left and right branches in parallel
func (s *smt) splitKeys(keys [][]byte, height int) ([][]byte, [][]byte) {
	for i, key := range keys {
		if bitIsSet(key, height) {
			return keys[:i], keys[i:]
		}
	}
	return keys, nil
}

// maybeAddShortcutToKV adds a shortcut key to the keys array to be updated.

            // Because they are EXTRA attributes, we consider that a
            // candidate which does NOT provide this value is a better match
            int candidateCount = candidateAttributeSets.length;
            BitSet any = new BitSet(candidateCount);
            for (int c = 0; c < candidateCount; c++) {
                ImmutableAttributes candidateAttributeSet = candidateAttributeSets[c];

func TestRemove(t *testing.T) {
	tcases := []struct {
		name         string
		bitsSet      []int
		bitsRemove   []int
		expectedMask string
	}{
		{
			name:         "Set bit 0. Remove bit 0",
			bitsSet:      []int{0},
			bitsRemove:   []int{0},
			expectedMask: "00",
		},
		{
			name:         "Set bits 0 and 1. Remove bit 1",
			bitsSet:      []int{0, 1},
			bitsRemove:   []int{1},
			expectedMask: "01",
		},

   *
   * <p><b>Note:</b> consider representing the array as a {@link java.util.BitSet} instead,
   * replacing {@code Booleans.contains(array, true)} with {@code !bitSet.isEmpty()} and {@code
   * Booleans.contains(array, false)} with {@code bitSet.nextClearBit(0) == sizeOfBitSet}.
   *
   * @param array an array of {@code boolean} values, possibly empty

   *
   * <p><b>Note:</b> consider representing the array as a {@link java.util.BitSet} instead,
   * replacing {@code Booleans.contains(array, true)} with {@code !bitSet.isEmpty()} and {@code
   * Booleans.contains(array, false)} with {@code bitSet.nextClearBit(0) == sizeOfBitSet}.
   *
   * @param array an array of {@code boolean} values, possibly empty

const uintSize = 32 << (^uint(0) >> 63) // 32 or 64

// bitset is a bit array for dense indexes.
type bitset []uint

func newBitset(n int) bitset {
	return make(bitset, (n+uintSize-1)/uintSize)
}

func (bs bitset) Reset() {
	for i := range bs {
		bs[i] = 0
	}
}

func (bs bitset) Set(idx uint32) {
	bs[idx/uintSize] |= 1 << (idx % uintSize)
}

func (bs bitset) Clear(idx uint32) {

    assertTrue(ArbitraryInstances.get(BitSet.class).isEmpty());
    assertTrue(ArbitraryInstances.get(TreeSet.class).isEmpty());
    assertTrue(ArbitraryInstances.get(TreeMap.class).isEmpty());
    assertFreshInstanceReturned(
        LinkedList.class,
        Deque.class,
        Queue.class,
        PriorityQueue.class,
        BitSet.class,
        TreeSet.class,
        TreeMap.class);
  }

    assertTrue(ArbitraryInstances.get(BitSet.class).isEmpty());
    assertTrue(ArbitraryInstances.get(TreeSet.class).isEmpty());
    assertTrue(ArbitraryInstances.get(TreeMap.class).isEmpty());
    assertFreshInstanceReturned(
        LinkedList.class,
        Deque.class,
        Queue.class,
        PriorityQueue.class,
        BitSet.class,
        TreeSet.class,
        TreeMap.class);
  }

          bytes[15], bytes[14], bytes[13], bytes[12], bytes[11], bytes[10], bytes[9], bytes[8]);
    }
  };

  /**
   * Models a lock-free array of bits.
   *
   * <p>We use this instead of java.util.BitSet because we need access to the array of longs and we
   * need compare-and-swap.
   */
  static final class LockFreeBitArray {
    private static final int LONG_ADDRESSABLE_BITS = 6;
    final AtomicLongArray data;

    int keyBits = 32;
    int hashBits = function.bits();

    // output loop tests input bit
    for (int i = 0; i < keyBits; i++) {
      int same = 0x0; // bitset for output bits with same values
      int diff = 0x0; // bitset for output bits with different values
      int count = 0;
      // originally was 2 * Math.log(...), making it try more times to avoid flakiness issues