Why it's worth studying: The key insight behind Fischer-Heun is the idea that we can break the prob-
lem apart into a top-level large problem a number of smaller bottom-level problems, then use tricks with
machine words to solve the bottom-level problems. The major data structure for decremental tree connec-
tivity uses a similar technique, but cleverly exploits machine-word-level parallelism to speed things up. It's
a great example of a data structure using a two-layered structure and might be a cool way to get some
more insight into just how versatile this technique can be.
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