Monday, November 30, 2015

http://www.mitbbs.com/article_t/JobHunting/33100775.html

http://blog.notdot.net/2012/09/Dam-Cool-Algorithms-Cardinality-


a very often-asked question, the above is the defacto standard method used 
in many implementations today (including redis) , it's the result of 20 
years of research. it's really stupid and unfair to bring this seemingly 
simple question to interview, I bet most of the interviewers don't know the 
above at all.

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