star1.py

import re, itertools

sampleData="""\
on x=-20..26,y=-36..17,z=-47..7
on x=-20..33,y=-21..23,z=-26..28
on x=-22..28,y=-29..23,z=-38..16
on x=-46..7,y=-6..46,z=-50..-1
on x=-49..1,y=-3..46,z=-24..28
on x=2..47,y=-22..22,z=-23..27
on x=-27..23,y=-28..26,z=-21..29
on x=-39..5,y=-6..47,z=-3..44
on x=-30..21,y=-8..43,z=-13..34
on x=-22..26,y=-27..20,z=-29..19
off x=-48..-32,y=26..41,z=-47..-37
on x=-12..35,y=6..50,z=-50..-2
off x=-48..-32,y=-32..-16,z=-15..-5
on x=-18..26,y=-33..15,z=-7..46
off x=-40..-22,y=-38..-28,z=23..41
on x=-16..35,y=-41..10,z=-47..6
off x=-32..-23,y=11..30,z=-14..3
on x=-49..-5,y=-3..45,z=-29..18
off x=18..30,y=-20..-8,z=-3..13
on x=-41..9,y=-7..43,z=-33..15
on x=-54112..-39298,y=-85059..-49293,z=-27449..7877
on x=967..23432,y=45373..81175,z=27513..53682\
"""

data = open('data.txt', 'r', encoding='utf-8').read()
# data = sampleData

cubes = set()
for line in data.split('\n'):
    match = re.match(r'(on|off) x=(-?\d+)\.\.(-?\d+),y=(-?\d+)\.\.(-?\d+),z=(-?\d+)\.\.(-?\d+)', line)
    status = match.group(1)
    x_start, x_end = int(match.group(2)), int(match.group(3))
    y_start, y_end = int(match.group(4)), int(match.group(5))
    z_start, z_end = int(match.group(6)), int(match.group(7))
    
    if not -50 <= x_start <= 50 or not -50 <= x_end <= 50 \
        or not -50 <= y_start <= 50 or not -50 <= y_end <= 50 \
        or not -50 <= z_start <= 50 or not -50 <= z_end <= 50:
        continue
    x_range = range(int(match.group(2)), int(match.group(3))+1)
    y_range = range(int(match.group(4)), int(match.group(5))+1)
    z_range = range(int(match.group(6)), int(match.group(7))+1)
    combinations = list(itertools.product(x_range, y_range, z_range))
    for combination in combinations:
        if status == 'on':
            cubes.add(combination)
        elif status == 'off' and combination in cubes:
            cubes.remove(combination)
print(len(cubes))