sdsl-lite VS ctrie-java

Succinct Data Structures [0] [1]. It encompass many different underlying data structure types but the overarching idea is that you want small data size while still keeping "big O" run time.

In other words, data structures that effectively reach a 'practical' entropy lower bound while still keeping asymptotic run time.

[0] https://en.wikipedia.org/wiki/Succinct_data_structure

[1] https://github.com/simongog/sdsl-lite

The book mentioned in another comment is probably the best way to go. But FYI, documentation for some data structures include references. An SDSL-lite example can be found here. And its equivalent in SDSL-RS can be found here.

Concurrent tries with non-blocking snapshots [0]

Say that you have a dataset that needs to be ordered, easily searchable, but is also updated quite frequently. Fast accesses are a pain if you decide to use traditional read-write locks.

Ctries are entirely lock-free, thus there is no waiting for your read operations when an update is happening, i.e. you run lookups on snapshots while updates happen.

They are also a lot of fun to implement, especially if you aren't familiar with lock-free algorithms! I did learn a lot doing it myself [1]

[0] http://aleksandar-prokopec.com/resources/docs/ctries-snapsho...

[1] https://github.com/mabeledo/ctrie-java