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October 25, 2023 17:35
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aoc 2022 day13
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from itertools import batched | |
def ordered(a, b) -> bool | None: | |
match a, b: | |
case int(i), int(j): | |
if i == j: | |
return None | |
return i < j | |
case list(i), list(j): | |
for x, y in zip(i, j): | |
if (result := ordered(x, y)) is not None: | |
return result | |
if len(i) == len(j): | |
return None | |
return len(i) < len(j) | |
case int(i), list(j): | |
return ordered([i], j) | |
case list(i), int(j): | |
return ordered(i, [j]) | |
case _ as unknown: | |
raise TypeError(f"Unknown type: {type(unknown)}") | |
with open("day13.txt") as f: | |
sum_of_indexes = 0 | |
for i, (a, b, *_) in enumerate(batched(f, 3)): | |
left, right = eval(a), eval(b) | |
order = ordered(left, right) | |
if order: | |
sum_of_indexes += i + 1 | |
print(sum_of_indexes) |
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from functools import cmp_to_key | |
from itertools import batched | |
def ordered(a, b) -> bool | None: | |
match a, b: | |
case int(i), int(j): | |
if i == j: | |
return None | |
return i < j | |
case list(i), list(j): | |
for x, y in zip(i, j): | |
if (result := ordered(x, y)) is not None: | |
return result | |
if len(i) == len(j): | |
return None | |
return len(i) < len(j) | |
case int(i), list(j): | |
return ordered([i], j) | |
case list(i), int(j): | |
return ordered(i, [j]) | |
case _ as unknown: | |
raise TypeError(f"Unknown type: {type(unknown)}") | |
def cmp(a, b) -> int: | |
if ordered(a, b): | |
return -1 | |
else: | |
return 1 | |
divider_packets = [[[2]], [[6]]] | |
with open("day13.txt") as f: | |
packets = [] | |
packets.extend(divider_packets) | |
for i, (a, b, *_) in enumerate(batched(f, 3)): | |
left, right = eval(a), eval(b) | |
packets.append(left) | |
packets.append(right) | |
decoder_key = 1 | |
for i, packet in enumerate(sorted(packets, key=cmp_to_key(cmp))): | |
if packet in divider_packets: | |
decoder_key *= i + 1 | |
print(decoder_key) |
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