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slightly slower but easier to understand solution

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Juan José Gutiérrez de Quevedo Pérez 2020-12-16 12:21:24 +01:00
parent 6b59d3efa6
commit 12af7dd9c4
1 changed files with 14 additions and 27 deletions
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41
16/2.py
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@ -1,5 +1,3 @@
from collections import OrderedDict
with open("input") as f: with open("input") as f:
content = [x.strip() for x in f] content = [x.strip() for x in f]
@ -21,7 +19,6 @@ def validate_rule(rule, value):
validates = True validates = True
return validates return validates
def validate_ticket(rules, ticket): def validate_ticket(rules, ticket):
for value in ticket: for value in ticket:
validates = False validates = False
@ -35,7 +32,7 @@ def validate_ticket(rules, ticket):
return True return True
part = 0 part = 0
rules = OrderedDict() rules = {}
othertickets = [] othertickets = []
myticket = [] myticket = []
for c in content: for c in content:
@ -60,31 +57,21 @@ for ticket in othertickets:
if validate_ticket(rules, ticket): if validate_ticket(rules, ticket):
newtickets.append(ticket) newtickets.append(ticket)
possible_mappings = OrderedDict() def validate_row(rule, row):
for field in range(0, len(myticket)): return all(map(lambda x: validate_rule(rule,x), row))
for rulename, rule in rules.items():
validates = True
for ticket in newtickets:
if not validate_rule(rule, ticket[field]):
validates = False
if validates:
if rulename not in possible_mappings:
possible_mappings[rulename] = []
possible_mappings[rulename].append(field)
mappings_lengths = [len(x) for __, x in possible_mappings.items()] final_mapping = {}
mappings_names = list(possible_mappings.keys()) new_remaining_rules = rules.copy()
while len(final_mapping) < len(myticket):
remaining_fields = set(range(0, len(myticket))) - set(final_mapping.values())
remaining_rules = new_remaining_rules.copy()
for rulename, rule in remaining_rules.items():
rows = [(field, [x[field] for x in newtickets]) for field in remaining_fields]
matching_fields = [fieldno for fieldno, row in rows if validate_row(rule, row)]
if len(matching_fields) == 1:
final_mapping[rulename] = matching_fields[0]
del(new_remaining_rules[rulename])
final_mapping = OrderedDict()
already_assigned = []
for length in sorted(mappings_lengths):
mapping_index = mappings_lengths.index(length)
rule_name = mappings_names[mapping_index]
pos_maps = possible_mappings[rule_name]
definitive_maps = list(filter(lambda x: x not in already_assigned, pos_maps))
already_assigned.extend(definitive_maps)
final_mapping[rule_name] = definitive_maps[0]
total = 1 total = 1
for rulename, fieldno in final_mapping.items(): for rulename, fieldno in final_mapping.items():
if rulename.startswith("departure"): if rulename.startswith("departure"):