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day16.py
74 lines (59 loc) · 1.96 KB
/
day16.py
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from aocd.models import Puzzle
from copy import deepcopy
import re
input: str = Puzzle(day=16, year=2020).input_data
tags, yourticket, tickets = input.split("\n\n")
regex = r"(?P<tag>[^:]+): (?P<l1>\d+)-(?P<l2>\d+) or (?P<l3>\d+)-(?P<l4>\d+)"
tags = tags.splitlines()
tags = [re.match(regex, x).groups() for x in tags]
tags = [(tag, int(l1), int(l2), int(l3), int(l4)) for (tag, l1, l2, l3, l4) in tags]
yourticket = [int(x) for x in yourticket.splitlines()[1].split(",")]
tickets = tickets.splitlines()[1:]
tickets = [[int(t) for t in line.split(",")] for line in tickets]
def containsValid(tag, currentValue):
_, l1, l2, l3, l4 = tag
return l1 <= currentValue <= l2 or l3 <= currentValue <= l4
scanningRate = 0
validTickets = []
for ticket in tickets:
isTicketOkay = True
for item_ticket in ticket:
ok = False
for t in tags:
if containsValid(t, item_ticket):
ok = True
if not ok:
scanningRate += item_ticket
isTicketOkay = False
break
if isTicketOkay:
validTickets.append(ticket)
validTickets.append(yourticket)
def part1():
return scanningRate
def part2():
d = dict()
zipped = list(zip(*validTickets))
for idx, row in enumerate(zipped):
row = list(row)
validTags = deepcopy(tags)
for currentValue in row:
validTags = [vt for vt in validTags if containsValid(vt, currentValue)]
d[idx] = validTags
idx2tag = dict()
ticketSize = len(yourticket)
for _ in range(ticketSize):
searchedTag = None
for k, v in d.items():
if len(v) == 1:
searchedTag = v[0]
idx2tag[k] = searchedTag[0]
break
for k in d.keys():
if searchedTag in d[k]:
d[k].remove(searchedTag)
mul = 1
for idx, tag in idx2tag.items():
if tag.startswith("departure"):
mul *= yourticket[idx]
return mul