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December 2, 2023 22:22
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Advent Of Code 2023
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| ''' | |
| Advent of Code 2023, Day Two, Task 1 | |
| See: https://adventofcode.com/2023/day/2 | |
| Run: python task.py < input.txt | |
| ''' | |
| from collections import namedtuple | |
| import sys | |
| GameRecord = namedtuple('GameRecord', 'index rounds') | |
| def parse_round(blob): | |
| '''e.g. 7 green, 14 red, 5 blue''' | |
| return { | |
| color: int(count) | |
| for count, color in map(str.split, blob.split(',')) | |
| } | |
| def parse_all_rounds(blob): | |
| '''e.g. 7 green, 14 red, 5 blue; 8 red, 4 green''' | |
| return map(parse_round, blob.strip().split(';')) | |
| def parse(line): | |
| '''e.g. Game 1: 7 green, 14 red, 5 blue; 8 red, 4 green''' | |
| game_blob, rounds_blob = line.strip().split(':') | |
| return GameRecord( | |
| index=int(game_blob.split()[1]), | |
| rounds=parse_all_rounds(rounds_blob), | |
| ) | |
| def possible(round, **limits): | |
| '''A round is possible if it doesn't exceed the limits''' | |
| for color, count in round.items(): | |
| if limits[color] < count: | |
| return False | |
| return True | |
| def valid(game, **limits): | |
| '''A game is valid if all its rounds are possible''' | |
| return all( | |
| possible(round, **limits) | |
| for round in game.rounds | |
| ) | |
| def solution(red=0, green=0, blue=0): | |
| def f(game): | |
| if valid(game, red=red, green=green, blue=blue): | |
| return game.index | |
| else: | |
| return 0 | |
| return f | |
| print(sum(map(solution(red=12, green=13, blue=14), map(parse, sys.stdin)))) |
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