54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
|
# -*- encoding: utf-8 -*-
|
||
|
|
|
||
|
|
import json
|
||
|
|
import sys
|
||
|
|
from functools import cmp_to_key
|
||
|
|
|
||
|
|
blocks = sys.stdin.read().strip().split("\n\n")
|
||
|
|
|
||
|
|
pairs = [tuple(json.loads(p) for p in block.split("\n")) for block in blocks]
|
||
|
|
|
||
|
|
|
||
|
|
def compare(lhs: list[int | list], rhs: list[int | list]) -> int:
|
||
|
|
if len(lhs) != len(rhs):
|
||
|
|
m = min(len(lhs), len(rhs))
|
||
|
|
r = compare(lhs[:m], rhs[:m])
|
||
|
|
|
||
|
|
if r != 0:
|
||
|
|
return r
|
||
|
|
else:
|
||
|
|
return 1 if len(rhs) > len(lhs) else -1
|
||
|
|
else:
|
||
|
|
for lhs_a, rhs_a in zip(lhs, rhs):
|
||
|
|
if isinstance(lhs_a, int) and isinstance(rhs_a, int):
|
||
|
|
if lhs_a != rhs_a:
|
||
|
|
return 1 if rhs_a > lhs_a else -1
|
||
|
|
elif isinstance(lhs_a, list) and isinstance(rhs_a, list):
|
||
|
|
r = compare(lhs_a, rhs_a)
|
||
|
|
if r != 0:
|
||
|
|
return r
|
||
|
|
else:
|
||
|
|
if not isinstance(lhs_a, list):
|
||
|
|
lhs_a = [lhs_a]
|
||
|
|
else:
|
||
|
|
assert isinstance(rhs_a, int)
|
||
|
|
rhs_a = [rhs_a]
|
||
|
|
assert isinstance(rhs_a, list)
|
||
|
|
r = compare(lhs_a, rhs_a)
|
||
|
|
if r != 0:
|
||
|
|
return r
|
||
|
|
return 0
|
||
|
|
|
||
|
|
|
||
|
|
answer_1 = sum(i + 1 for i, (lhs, rhs) in enumerate(pairs) if compare(lhs, rhs) == 1)
|
||
|
|
print(f"answer_1 is {answer_1}")
|
||
|
|
|
||
|
|
dividers = [[[2]], [[6]]]
|
||
|
|
|
||
|
|
packets = [packet for packets in pairs for packet in packets]
|
||
|
|
packets.extend(dividers)
|
||
|
|
packets = list(reversed(sorted(packets, key=cmp_to_key(compare))))
|
||
|
|
|
||
|
|
d_index = [packets.index(d) + 1 for d in dividers]
|
||
|
|
print(f"answer 2 is {d_index[0] * d_index[1]}")
|