Priority Queues with C#: Listing 5.

Checking the state of the priority queue.

public bool IsConsistent()
{
  if (data.Count == 0) return true;
  int li = data.Count - 1; // last index
  for (int pi = 0; pi  < data.Count; ++pi) // each parent index
  {
    int lci = 2 * pi + 1; // left child index
    int rci = 2 * pi + 2; // right child index
    if (lci  <= li && data[pi].CompareTo(data[lci])  > 0) return false;
    if (rci  <= li && data[pi].CompareTo(data[rci])  > 0) return false;
  }
  return true; // Passed all checks
}

About the Author

Dr. James McCaffrey works for Microsoft Research in Redmond, Wash. He has worked on several Microsoft products including Azure and Bing. James can be reached at jamccaff@microsoft.com.

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