100 lines
3.1 KiB
Python
100 lines
3.1 KiB
Python
import aoclib
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DAY = 16
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TEST_SOLUTION_PART1 = 71
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TEST_SOLUTION_PART2 = 7
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def parse_input(to_parse):
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restraints = {}
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my_ticket = []
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other_tickets = []
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for i, line in enumerate(to_parse):
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if not line:
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my_ticket = list(map(int, to_parse[i+2].split(",")))
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other_tickets = [list(map(int, ticket.split(","))) for ticket in to_parse[i+5:]]
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break
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field, limits = line.split(": ")
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limit_low, limit_hi = limits.split(" or ")
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min_low, max_low = limit_low.split("-")
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min_hi, max_hi = limit_hi.split("-")
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restraints[field] = [(int(min_low), int(max_low)), (int(min_hi), int(max_hi))]
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return restraints, my_ticket, other_tickets
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def is_valid_number(number, restraints):
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for restraint in restraints.values():
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if restraint[0][0] <= number <= restraint[0][1] or restraint[1][0] <= number <= restraint[1][1]:
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return True
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return False
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def part1(test_mode=False):
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my_input = aoclib.getInputAsArray(day=DAY, test=test_mode)
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restraints, _, other_tickets = parse_input(my_input)
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invalid_numbers = []
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for ticket in other_tickets:
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for number in ticket:
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if not is_valid_number(number, restraints):
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invalid_numbers.append(number)
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return sum(invalid_numbers)
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def get_single_possible_positions(possible_positions):
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single_possibilities = []
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while 1:
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all_done = True
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for field, possibilities in possible_positions.items():
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if len(possibilities) == 1:
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possible_position = possibilities[0]
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if possible_position not in single_possibilities:
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all_done = False
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single_possibilities.append(possible_position)
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for check_field, check_positions in possible_positions.items():
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if possible_position in check_positions and len(check_positions) > 1:
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possible_positions[check_field].remove(possible_position)
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if all_done:
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break
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return possible_positions
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def part2(test_mode=False):
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my_input = aoclib.getInputAsArray(day=DAY, test=test_mode)
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restraints, my_ticket, other_tickets = parse_input(my_input)
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possible_positions = {}
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num_fields = len(my_ticket)
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for field in restraints:
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possible_positions[field] = list(range(num_fields))
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for ticket in other_tickets:
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invalid = False
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for number in ticket:
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if not is_valid_number(number, restraints):
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invalid = True
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break
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if invalid:
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continue
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for position, number in enumerate(ticket):
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for field, restraint in restraints.items():
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if not restraint[0][0] <= number <= restraint[0][1] and not restraint[1][0] <= number <= restraint[1][1]:
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possible_positions[field].remove(position)
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possible_positions = get_single_possible_positions(possible_positions)
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answer = 1
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for field in restraints:
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if field.startswith('departure'):
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answer *= my_ticket[possible_positions[field][0]]
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return answer
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