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* Day 20Tom Smeding2020-12-27
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* Day 19Tom Smeding2020-12-25
The second part was supposed to be more difficult than the first part; the problem statement hinted that you might need to memoise the set of sentences matched by non-recursive rules, "especially rules 42 and 31". Why the hell then did my utterly naive matcher from part 1 work without changes in ~60ms total?