I thought this was an unusually good article. It covered the topic very clearly, with relevant code samples written with excellent and idiomatic style (and usef

I thought this was an unusually good article. It covered the topic very clearly, with relevant code samples written with excellent and idiomatic style (and useful inline comments too), as well as covering the process of going from theory to implementation. This is also a great reminder of how incredibly elegant and powerful the basic data structures (hashmaps and binary trees in this case) really are. It doesn't take a fancy implementation to make this stuff work. Just the basics gets it done.