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47 lines
1.1 KiB
Python
47 lines
1.1 KiB
Python
4 years ago
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"""Solution to 2020/07 Part 2"""
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import pprint
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from collections import defaultdict
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# key: bag, value: list of tuples (count, bag which must be contained)
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tree = defaultdict(list)
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def words(sentence, start, end):
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"""
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Strips consecutive words from a sentance
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Words are whitespace separated.
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Words are 1-indexed.
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"""
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return ' '.join(sentence.split(' ')[start-1:end])
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with open('input', 'r') as f:
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for line in f.readlines():
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source, targets = line.strip().split(' contain ')
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source = words(source, 1, 2)
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if targets == 'no other bags.':
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continue
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for target in targets.split(', '):
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count = int(target.split(' ')[0])
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color = words(target, 2, 3)
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tree[source].append((count, color))
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# pprint.pprint(tree)
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processed = set()
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queue = [(1, 'shiny gold')]
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count = 0
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while len(queue):
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source_count, source = queue.pop()
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count += source_count
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for target_count, target in tree[source]:
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queue.append((source_count * target_count, target))
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print(count - 1)
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# Wrong: 41560
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