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