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https://github.com/peter-tanner/advent-of-code-2020.git
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87 lines
2.3 KiB
Python
87 lines
2.3 KiB
Python
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from copy import deepcopy
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import itertools
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foods = [ [ set(y.replace(',','').split(' ')) for y in x.replace(')','').split(' (contains ')] for x in open('input').read().splitlines() ]
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recipes = [ x[0] for x in foods ]
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allergens = [ x[1] for x in foods ]
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# print(foods)
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# print(recipes)
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def get_relationships(values):
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relationships = {}
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for r in values:
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# print(r)
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for ig in r:
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if ig not in relationships:
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relationships.update({ig:set()})
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i=0
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for r_ in values:
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if ig in r_:
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relationships[ig].add(i)
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i+=1
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return relationships
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# print(get_relationships(recipes))
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# print(get_relationships(allergens))
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rel = get_relationships(recipes)
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arel = get_relationships(allergens)
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non_allergen = []
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for i in rel:
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possible = False
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for a in arel:
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# print(rel[i].intersection(arel[a]))
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if len(rel[i].intersection(arel[a])) == len(arel[a]):
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possible = True
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break
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if possible == False:
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non_allergen.append(i)
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# print(possible, i)
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c=0
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for i in non_allergen:
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c+=list(itertools.chain(*recipes)).count(i)
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print(c)
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rel = get_relationships(recipes)
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arel = get_relationships(allergens)
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allergen = {}
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for i in rel:
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test = []
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for a in arel:
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# print(rel[i].intersection(arel[a]))
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if len(rel[i].intersection(arel[a])) == len(arel[a]):
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test.append(a)
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if len(test) > 0 :
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allergen.update({i:test})
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# print(test, i)
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# print(allergen)
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sorted_list = {}
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def alupdate(allergen):
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allergen_ = deepcopy(allergen)
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mod = False
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for al in allergen:
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als = allergen[al]
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if len(als) == 1:
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sorted_list.update({als[0]:al})
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for al_ in allergen:
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if als[0] in allergen[al_]:
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_ = allergen_[al_]
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_.remove(als[0])
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allergen_[al_] = _
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mod = True
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# print(allergen_)
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if mod == True:
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alupdate(allergen_)
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else:
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for al in allergen_:
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if len(allergen_[al]) == 1:
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sorted_list.update({allergen_[al][0]:al})
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alupdate(allergen)
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# print(sorted_list)
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print(','.join([sorted_list[x] for x in sorted(sorted_list)]))
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