80 lines
2.1 KiB
Python
80 lines
2.1 KiB
Python
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import re
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import json
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my_bag = "shiny gold"
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def get_input(sample = False, sample_number: int = 1):
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with open("sample_%d" % sample_number if sample else "input", "r") as f:
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return [line.strip() for line in f.readlines()]
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def split_n_bags(string: str):
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zero_bags = "no other"
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if string == zero_bags:
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return "", 0
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for i in range(len(string)):
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if string[i] == " ":
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return string[i+1:], int(string[:i])
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def parse_input(lines: list):
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ret = {}
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bag_re = re.compile(" ?bags?[ ,.]?")
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for line in lines:
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outer, inner = line.split("contain ")
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outer = bag_re.sub("", outer)
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inner = [bag_re.sub("", x) for x in inner.split(", ")]
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if outer not in ret:
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ret[outer] = {}
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children = {}
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for items in inner:
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bag, n = split_n_bags(items)
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if n != 0:
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children[bag] = n
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if len(children) > 0:
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ret[outer]["children"] = children
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for child in children:
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if child not in ret: ret[child] = {}
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if "parents" not in ret[child]: ret[child]["parents"] = set()
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ret[child]["parents"].add(outer)
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return ret
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def fetch_parents_of(child: str, data: dict):
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if "parents" not in data[child]:
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return [child]
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parents = data[child]["parents"]
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parents_total = [child] if child != my_bag else []
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for parent in parents:
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parents_total.extend(fetch_parents_of(parent, data))
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return parents_total
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def count_parents_of(child: str, data: dict):
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return len(set(fetch_parents_of(child, data)))
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def count_children_of(parent: str, data: dict):
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if "children" not in data[parent]:
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return 0
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children = data[parent]["children"]
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return sum([number + number * count_children_of(child, data) for child, number in children.items()])
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def get_result(data: dict, sample: bool = False, part: int = 1):
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if part == 1:
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return count_parents_of(my_bag, data)
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else:
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return count_children_of(my_bag, data)
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if __name__ == "__main__":
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print(get_result(parse_input(get_input()), part = 2))
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