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There are so many things to respond to here that I have no idea where to begin. So I'll list them randomly:
  • Where do you get the O(log2(n)) from? With a flat memory model, hashing algorithms are not O(log2(n)).
  • Re-read my post and you'll see that I explicitly acknowledge the fact that hackers do not exactly use big-O notation in the way that Knuth did. Why do you think that he said otherwise?
  • Re-read the root post and you'll discover that pg both misunderstood big-O notation as used by Knuth, and as used by hackers. As far as most people are concerned, a hash lookup is O(1). That he thought otherwise was due to a misunderstanding on his part about what big-O notation means.
  • Re-read the root post and you'll find lots of incorrect attempted pedantry. When someone tries to get pedantic, I think it is fair and reasonable to be pedantic back.

In reply to Re^3: A short meditation about hash search performance by tilly
in thread A short meditation about hash search performance by pg

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