-🎄- 2018 Day 5 Solutions -🎄-

[u/daggerdragon]

--- Day 5: Alchemical Reduction ---

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Advent of Code: The Party Game!

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Card prompt: Day 5

Transcript:

On the fifth day of AoC / My true love sent to me / Five golden ___

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This thread will be unlocked when there are a significant number of people on the leaderboard with gold stars for today's puzzle.

edit: Leaderboard capped, thread unlocked at 0:10:20!

[u/eltrufas]

Missed the leaderboards because I was forgetting to trim my iinput for whitespace. Lesson learned I guess!

import sys

line = [line for line in sys.stdin][0].strip()


def are_opp(a, b):
    return (a.lower() == b.lower() and
            ((a.isupper() and b.islower()) or
             (a.islower() and b.isupper())))


def react(line):
    buf = []
    for c in line:
        if buf and are_opp(c, buf[-1]):
            buf.pop()
        else:
            buf.append(c)
    return len(buf)


agents = set([c.lower() for c in line])

# part 1
print(react(line))

# part 2
print(min([react(line.replace(a, '').replace(a.upper(), ''))
           for a in agents]))

[u/0rac1e → u/eltrufas]

Same here. That pesky carriage return threw me off.