diff --git a/2023/day1.py b/2023/day1.py index a44fbd0..3acd9ad 100644 --- a/2023/day1.py +++ b/2023/day1.py @@ -1,9 +1,8 @@ -import string import sys -lines = sys.stdin.read().split("\n") +lines = sys.stdin.read().splitlines() -lookups_1 = {d: int(d) for d in string.digits[1:]} +lookups_1 = {str(d): d for d in range(1, 10)} lookups_2 = lookups_1 | { d: i + 1 for i, d in enumerate( diff --git a/2023/day2.py b/2023/day2.py index f5cdf71..f4db8ed 100644 --- a/2023/day2.py +++ b/2023/day2.py @@ -1,62 +1,45 @@ import operator import sys -from dataclasses import dataclass from functools import reduce from typing import Literal, TypeAlias, cast -Cube: TypeAlias = Literal["red", "blue", "green"] +CubeType: TypeAlias = Literal["red", "blue", "green"] +MAX_CUBES: dict[CubeType, int] = {"red": 12, "green": 13, "blue": 14} -@dataclass(frozen=True) -class Game: - id: int - set_of_cubes: list[dict[Cube, int]] - - -lines = sys.stdin.read().split("\n") - -games: list[Game] = [] +# parse games +lines = sys.stdin.read().splitlines() +games: dict[int, list[dict[CubeType, int]]] = {} for line in filter(bool, lines): id_part, sets_part = line.split(":") - games.append( - Game( - id=int(id_part.split(" ")[-1]), - set_of_cubes=[ - { - cast(Cube, s[1]): int(s[0]) - for cube_draw in cube_set_s.strip().split(", ") - if (s := cube_draw.split(" ")) - } - for cube_set_s in sets_part.strip().split(";") - ], - ) - ) + games[int(id_part.split(" ")[-1])] = [ + { + cast(CubeType, s[1]): int(s[0]) + for cube_draw in cube_set_s.strip().split(", ") + if (s := cube_draw.split(" ")) + } + for cube_set_s in sets_part.strip().split(";") + ] # part 1 -MAX_CUBES: dict[Cube, int] = {"red": 12, "green": 13, "blue": 14} - answer_1 = sum( - game.id - for game in games + id + for id, set_of_cubes in games.items() if all( n_cubes <= MAX_CUBES[cube] - for cube_set in game.set_of_cubes + for cube_set in set_of_cubes for cube, n_cubes in cube_set.items() ) ) - print(f"answer 1 is {answer_1}") # part 2 answer_2 = sum( reduce( operator.mul, - ( - max(cube_set.get(cube, 0) for cube_set in game.set_of_cubes) - for cube in MAX_CUBES - ), + (max(cube_set.get(cube, 0) for cube_set in set_of_cubes) for cube in MAX_CUBES), ) - for game in games + for set_of_cubes in games.values() ) print(f"answer 2 is {answer_2}") diff --git a/2023/day3.py b/2023/day3.py index a2909d7..db1fff4 100644 --- a/2023/day3.py +++ b/2023/day3.py @@ -2,7 +2,9 @@ import string import sys from collections import defaultdict -lines = list(filter(bool, sys.stdin.read().split("\n"))) +NOT_A_SYMBOL = "." + string.digits + +lines = sys.stdin.read().splitlines() values: list[int] = [] gears: dict[tuple[int, int], list[int]] = defaultdict(list) @@ -30,7 +32,7 @@ for i, line in enumerate(lines): assert i2 >= 0 and i2 < len(lines) assert j2 >= 0 and j2 < len(line) - if lines[i2][j2] != "." and lines[i2][j2] not in string.digits: + if lines[i2][j2] not in NOT_A_SYMBOL: found = True if lines[i2][j2] == "*": @@ -42,8 +44,10 @@ for i, line in enumerate(lines): # continue starting from the end of the number j = k +# part 1 answer_1 = sum(values) -answer_2 = sum(v1 * v2 for v1, v2 in filter(lambda vs: len(vs) == 2, gears.values())) - print(f"answer 1 is {answer_1}") + +# part 2 +answer_2 = sum(v1 * v2 for v1, v2 in filter(lambda vs: len(vs) == 2, gears.values())) print(f"answer 2 is {answer_2}") diff --git a/2023/day4.py b/2023/day4.py new file mode 100644 index 0000000..3cc9d6c --- /dev/null +++ b/2023/day4.py @@ -0,0 +1,41 @@ +import sys +from dataclasses import dataclass + + +@dataclass(frozen=True) +class Card: + id: int + numbers: list[int] + values: list[int] + + +lines = sys.stdin.read().splitlines() + +cards: list[Card] = [] +for line in lines: + id_part, e_part = line.split(":") + numbers_s, values_s = e_part.split("|") + cards.append( + Card( + id=int(id_part.split()[1]), + numbers=[int(v.strip()) for v in numbers_s.strip().split()], + values=[int(v.strip()) for v in values_s.strip().split()], + ) + ) + +winnings = [sum(1 for n in card.values if n in card.numbers) for card in cards] + +# part 1 +answer_1 = sum(2 ** (winning - 1) for winning in winnings if winning > 0) +print(f"answer 1 is {answer_1}") + +# part 2 +card2cards = {i: list(range(i + 1, i + w + 1)) for i, w in enumerate(winnings)} +card2values = {i: 0 for i in range(len(cards))} + +for i in range(len(cards)): + card2values[i] += 1 + for j in card2cards[i]: + card2values[j] += card2values[i] + +print(f"answer 2 is {sum(card2values.values())}") diff --git a/2023/inputs/day4.txt b/2023/inputs/day4.txt new file mode 100644 index 0000000..440c435 --- /dev/null +++ b/2023/inputs/day4.txt @@ -0,0 +1,203 @@ +Card 1: 8 86 59 90 68 52 55 24 37 69 | 10 55 8 86 6 62 69 68 59 37 91 90 24 22 78 61 58 89 52 96 95 94 13 36 81 +Card 2: 6 42 98 5 17 31 13 36 63 61 | 99 88 14 20 63 5 56 33 6 21 92 13 17 7 31 93 30 74 98 15 11 36 61 42 47 +Card 3: 16 58 72 77 1 67 33 82 68 7 | 16 37 15 75 78 1 49 82 22 45 83 58 77 79 50 88 98 67 33 72 42 29 35 7 68 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