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47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
4 years ago
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"""Solution for 2020/21"""
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from functools import reduce
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foods = []
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all_ingredients = set()
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all_allergenes = set()
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with open('input', 'r') as f:
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for line in f.readlines():
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[ing, alg] = line.strip(' \n)').split(' (contains ')
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ing = set(ing.split(' '))
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alg = set(alg.split(', '))
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all_ingredients = all_ingredients.union(ing)
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all_allergenes = all_allergenes.union(alg)
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foods.append((ing, alg))
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allergeneMap = {}
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for ingredients, allergenes in foods:
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for allergene in allergenes:
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if allergene not in allergeneMap:
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allergeneMap[allergene] = ingredients
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else:
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allergeneMap[allergene] = allergeneMap[allergene].intersection(
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ingredients)
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print(f'{allergeneMap=}')
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allergenic = reduce(lambda x, y: x.union(y), allergeneMap.values())
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unallergenic = all_ingredients.difference(allergenic)
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print(f'{allergenic=}')
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print(f'{unallergenic=}')
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ingredientMap = {}
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processed = set()
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while len(processed) < len(allergenic):
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for allergene, ingredients in allergeneMap.items():
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reduced_ing = ingredients.difference(processed)
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if len(reduced_ing) == 1:
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ing = reduced_ing.pop()
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processed.add(ing)
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ingredientMap[ing] = allergene
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print(f'{ingredientMap=}')
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sorted_items = sorted(ingredientMap.items(), key=lambda x: x[1])
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print(','.join(map(lambda x: x[0], sorted_items)))
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