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111 lines
4.1 KiB
Python
111 lines
4.1 KiB
Python
"""AOC 2020 Day 21"""
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import pathlib
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import time
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import collections
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TEST_INPUT = """mxmxvkd kfcds sqjhc nhms (contains dairy, fish)
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trh fvjkl sbzzf mxmxvkd (contains dairy)
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sqjhc fvjkl (contains soy)
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sqjhc mxmxvkd sbzzf (contains fish)"""
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def read_input(input_path: str) -> str:
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"""take input file path and return a str with the file's content"""
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with open(input_path, 'r') as input_file:
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input_data = input_file.read().strip()
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return input_data
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def extract(input_data: str) -> tuple:
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"""take input data and return the appropriate data structure"""
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recipes = list()
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ingredient_allergenes = collections.defaultdict(set)
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recipes_with_allergene = collections.defaultdict(list)
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for index, recipe in enumerate(input_data.split('\n')):
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ingredients, allergenes = recipe.split(' (contains ')
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ingredients = set(ingredients.split())
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allergenes = set(allergenes.rstrip(')').split(', '))
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recipes.append(ingredients)
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for ingredient in ingredients:
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ingredient_allergenes[ingredient] |= allergenes
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for allergene in allergenes:
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recipes_with_allergene[allergene].append(index)
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return recipes, ingredient_allergenes, recipes_with_allergene
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def find_safe_ingredients(recipes: list, ingredient_allergenes: dict, recipes_with_allergene: dict) -> list:
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"""return a list of ingredients not containing allergenes"""
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safe_ingredients = list()
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for ingredient, allergenes in ingredient_allergenes.items():
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impossible_allergenes = set()
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for allergene in allergenes:
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if any(ingredient not in recipes[i] for i in recipes_with_allergene[allergene]):
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impossible_allergenes.add(allergene)
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allergenes -= impossible_allergenes
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if not allergenes:
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safe_ingredients.append(ingredient)
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return safe_ingredients
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def assign_allergenes(ingredient_allergenes: dict) -> dict:
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"""return a dict with each ingredient and its allergene"""
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assigned_allergenes = dict()
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while ingredient_allergenes:
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assigned_allergene = str()
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assigned_ingredient = str()
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for ingredient, allergenes in ingredient_allergenes.items():
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if len(allergenes) == 1:
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assigned_allergene = allergenes.pop()
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assigned_ingredient = ingredient
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break
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assigned_allergenes[assigned_allergene] = assigned_ingredient
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ingredient_allergenes.pop(assigned_ingredient)
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for ingredient, allergenes in ingredient_allergenes.items():
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if assigned_allergene in allergenes:
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allergenes.remove(assigned_allergene)
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return assigned_allergenes
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def part1(entries: tuple) -> int:
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"""part1 solver"""
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recipes, ingredient_allergenes, recipes_with_allergene = entries
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safe_ingredients = find_safe_ingredients(recipes, ingredient_allergenes, recipes_with_allergene)
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return sum(ingredient in recipe for recipe in recipes for ingredient in safe_ingredients)
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def part2(entries: tuple) -> str:
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"""part2 solver"""
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recipes, ingredient_allergenes, recipes_with_allergene = entries
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safe_ingredients = find_safe_ingredients(recipes, ingredient_allergenes, recipes_with_allergene)
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for ingredient in safe_ingredients:
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ingredient_allergenes.pop(ingredient)
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assigned_allergenes = assign_allergenes(ingredient_allergenes)
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return ','.join(map(assigned_allergenes.get, sorted(assigned_allergenes)))
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def test_input_day_21():
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"""pytest testing function"""
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entries = extract(TEST_INPUT)
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assert part1(entries) == 5
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assert part2(entries) == 'mxmxvkd,sqjhc,fvjkl'
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def test_bench_day_21(benchmark):
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"""pytest-benchmark function"""
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benchmark(main)
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def main():
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"""main function"""
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input_path = str(pathlib.Path(__file__).resolve().parent.parent) + "/inputs/" + str(pathlib.Path(__file__).stem)
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start_time = time.time()
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input_data = read_input(input_path)
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entries = extract(input_data)
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print("Part 1: %d" % part1(entries))
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print("Part 2: %s" % part2(entries))
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end_time = time.time()
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print("Execution time: %f" % (end_time-start_time))
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if __name__ == "__main__":
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main()
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