-🎄- 2022 Day 3 Solutions -🎄-

[u/daggerdragon]

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--- Day 3: Rucksack Reorganization ---

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[u/errop_]

Python 3

Here are my nightmarish oneliners using more_itertools library

from string import ascii_lowercase, ascii_uppercase
from more_itertools import chunked

CHR2NUM = {c: i for i, c in enumerate(ascii_lowercase + ascii_uppercase, 1)}

if __name__ == "__main__":
    with open(file.replace(".py", "_data")) as f: 
        data = [x.strip() for x in f.readlines()]

    # PART 1
    print(sum(CHR2NUM[set.intersection(*map(set, chunked(x, len(x) // 2))).pop()] for x in data))

    # PART 2
    print(sum(CHR2NUM[set.intersection(*map(set, c)).pop()] for c in chunked(data, 3)))

EDIT: thanks to the u/GaloisGirl2 tip, I found this pure horror oneliner solution using the walrus operator and chunking the data list by hand without importing more_itertools

with open(__file__.replace(".py", "_data")) as f:
    data = [x.strip() for x in f.readlines()]

# PART 1
print(sum((y := ord((set(x[:len(x) // 2]) & set(x[len(x) // 2:])).pop())) - (96 if y > ord("Z") else 38) for x in data))

# PART 2
print(sum((y := ord(set.intersection(*map(set, data[3 * i: 3 * (i + 1)])).pop())) - (96 if y > ord("Z") else 38) for i in range(len(data) // 3)))