LINKDING

I haven't implemented bidirectional BFS but now I kind of want to, I didn't realize how much improvement it can be. Also the trick with starting the next step from the "narrower side" makes a lot of intuitive sense.

Never realized how much subtlety there is in calculating, say, 95-th percentile of some value given a running stream of values. Datadog's approach makes a lot of sense and I love that they described it in a paper and shared a few open source implementations like this one.