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Discussion on: Advent of Code 2020 Solution Megathread - Day 6: Custom Customs

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Yuan Gao • • Edited

Python one-liners, thanks to set theory and list comprehension, and map
Part 1:

sum([len(set(entry.replace("\n",""))) for entry in open("input.txt").read().split("\n\n")])
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Part 2:

sum(len(set.intersection(*map(set, entry.split()))) for entry in open("input.txt").read().split("\n\n"))
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I try to explain this more fully at dev.to/meseta/advent-of-code-2020-...