advent-of-code/2020/solutions/5/python/main.py

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2020-12-05 13:17:36 +01:00
from os.path import join, dirname
from itertools import product
from typing import Tuple
def from_binary(code: str, high: str) -> int:
return int(''.join([
'1' if char == high else '0'
for char in code
]), 2)
def read_seat(seat) -> Tuple[int, int]:
row_raw = seat[:-3]
column_raw = seat[-3:]
row = from_binary(row_raw, 'B')
column = from_binary(column_raw, 'R')
return row, column
def seat_code(row: int, column: int) -> int:
return row * 8 + column
data = join(dirname(__file__), '../data.txt')
with open(data) as f:
seats = f.read().strip().split('\n')
free = list(product(range(4, 126), range(8)))
maximum = 0
for seat in seats:
row, column = read_seat(seat)
m = row * 8 + column
maximum = max(maximum, m)
free.remove((row, column))
print(f"Highers ID:\t{maximum}")
# Find the remaining seat
row_max = 0
row_min = 128
for row, _ in free:
row_max = max(row_max, row)
row_min = min(row_min, row)
remaining = [
(row, column)
for row, column in free
if row >= row_min + 1 and row <= row_max - 2
][0]
my_ticket = seat_code(*remaining)
print(f"My Ticket:\t{my_ticket}")