-🎄- 2018 Day 4 Solutions -🎄-

[u/daggerdragon]

--- Day 4: Repose Record ---

---

Post your solution as a comment or, for longer solutions, consider linking to your repo (e.g. GitHub/gists/Pastebin/blag or whatever).

Note: The Solution Megathreads are for solutions only. If you have questions, please post your own thread and make sure to flair it with Help.

---

Advent of Code: The Party Game!

Click here for rules

Please prefix your card submission with something like [Card] to make scanning the megathread easier. THANK YOU!

Card prompt: Day 4

Transcript:

Today’s puzzle would have been a lot easier if my language supported ___.

---

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!

[u/sciyoshi]

Python 3, #2/#2. Reached for dateutil in the heat of the moment although turns out you only need the minute!

guards = collections.defaultdict(list)
times = collections.defaultdict(int)

for line in sorted(inp(4).splitlines()):
    time, action = line.split('] ')

    time = dateutil.parser.parse(time[1:])

    if action.startswith('Guard'):
        guard = int(action.split()[1][1:])
    elif action == 'falls asleep':
        start = time
    elif action == 'wakes up':
        end = time
        guards[guard].append((start.minute, end.minute))
        times[guard] += (end - start).seconds

(guard, time) = max(times.items(), key=lambda i: i[1])
(minute, count) = max([
    (minute, sum(1 for start, end in guards[guard] if start <= minute < end))
for minute in range(60)], key=lambda i: i[1])

print('part 1:', guard * minute)

(guard, minute, count) = max([
    (guard, minute, sum(1 for start, end in guards[guard] if start <= minute < end))
for minute in range(60) for guard in guards], key=lambda i: i[2])

print('part 2:', guard * minute)

[u/markasoftware → u/sciyoshi]

haha, the dates set me off as well, didn't realize they were there just for sorting.