Lecture 8: Universal Hashing, Perfect Hashing
recorded by: Massachusetts Institute of Technology, MIT
published: Feb. 10, 2009, recorded: October 2005, views: 8285
released under terms of: Creative Commons Attribution No Derivatives (CC-BY-ND)
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"Hashing. Today we're going to do some amazing stuff with hashing. And, really, this is such neat stuff, it's amazing. We're going to start by addressing a fundamental weakness of hashing. And that is that for any choice of hash function There exists a bad set of keys that all hash to the same slot. OK. So you pick a hash function. We looked at some that seem to work well in practice, that are easy to put into your code. But whichever one you pick, there's always some bad set of keys. So you can imagine, just to drive this point home a little bit..."
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