diff --git a/day2/day2.py b/day2/day2.py index cf01a5e..78c4de7 100644 --- a/day2/day2.py +++ b/day2/day2.py @@ -5,19 +5,18 @@ def part1(lines): result = set() for index, line in enumerate(lines): game_id = index + 1 - _, line = line.split(":") + _, line = line.split(": ") result.add(int(game_id)) - hands = line.rstrip().split(";") + hands = line.rstrip().split("; ") for hand in hands: colors = {"red": 0, "green": 0, "blue": 0} - cubes = hand.split(",") + cubes = hand.split(", ") for cube in cubes: - _, n, color = cube.split(" ") + n, color = cube.split() colors[color] = int(n) if colors["red"] > 12 or colors["green"] > 13 or colors["blue"] > 14: - # impossible configuration, remove this game_id from the result - if int(game_id) in result: - result.remove(int(game_id)) + # impossible configuration, remove this game_id from the result (if present) + result.discard(int(game_id)) print(f"Part 1: {sum(result)}") @@ -25,12 +24,12 @@ def part2(lines): result = [] for line in lines: colors = {"red": 0, "green": 0, "blue": 0} - _, line = line.split(":") - sets = line.rstrip().split(";") - for s in sets: - cubes = s.split(",") + _, line = line.split(": ") + hands = line.rstrip().split("; ") + for hand in hands: + cubes = hand.split(", ") for cube in cubes: - _, n, color = cube.split(" ") + n, color = cube.split() colors[color] = max(colors[color], int(n)) result.append(prod(colors.values())) print(f"Part 2: {sum(result)}") diff --git a/day3/day3.py b/day3/day3.py new file mode 100644 index 0000000..d25a7df --- /dev/null +++ b/day3/day3.py @@ -0,0 +1,82 @@ +from typing import Tuple, List + + +def browse_schema(schema): + total_parts = 0 + buf = [] + max_row, max_col = len(schema), len(schema[0]) + + for y in range(max_row): + for x in range(max_col): + item = schema[y][x] + if item.isnumeric(): + # continue parsing full number + buf.append(item) + elif buf: + # end of a number, do the engine part check + if buf: + neighbors = get_neighbors((x, y), len(buf), schema) + + if is_engine_part(neighbors): + part_number = int("".join(buf)) + total_parts += part_number + + buf.clear() # reached end of a number, clear buffer + + print(f"Part 1, sum of the parts numbers = {total_parts}") + print(f"Part 2, sum of the gear ratios = TODO") + + +def is_engine_part(neighbors: List[str]) -> bool: + # get list of symbols (not '.', \n or a number) + symbols = filter(lambda x: not x.isnumeric() and not x in (".", "\n"), neighbors) + return next(symbols, None) is not None + + +def get_neighbors(pos: Tuple[int, int], length: int, schema: List[List[str]]) -> List[str]: + x, y = pos + start_x = x - length + neighbors = [get_neighbors_of_digit((x, y), schema) for x in range(start_x, x)] + neighbors = [item for sublist in neighbors for item in sublist] # flatten list of list + return neighbors + + +def get_neighbors_of_digit(pos: Tuple[int, int], schema: List[List[str]]) -> List[str]: + max_row, max_col = len(schema), len(schema[0]) + x, y = pos + neighbors = [] + + # top + if y-1 >= 0: + neighbors.append(schema[y-1][x]) + # bottom: + if y+1 < max_row: + neighbors.append(schema[y+1][x]) + # left + if x-1 >= 0: + neighbors.append(schema[y][x-1]) + # right + if x+1 < max_col: + neighbors.append(schema[y][x+1]) + # top-left + if y-1 >= 0 and x-1 >= 0: + neighbors.append(schema[y-1][x-1]) + # top-right + if y-1 >= 0 and x+1 < max_col: + neighbors.append(schema[y-1][x+1]) + # bottom-left + if y+1 < max_row and x-1 >= 0: + neighbors.append(schema[y+1][x-1]) + # bottom-right + if y+1 < max_row and x+1 < max_col: + neighbors.append(schema[y+1][x+1]) + + return neighbors + + +if __name__ == "__main__": + import sys + infile = sys.argv[1] + with open(infile) as f: + schema = [[c for c in line] for line in f.readlines()] + browse_schema(schema) diff --git a/day3/example.txt b/day3/example.txt new file mode 100644 index 0000000..b20187f --- /dev/null +++ b/day3/example.txt @@ -0,0 +1,10 @@ +467..114.. +...*...... +..35..633. +......#... +617*...... +.....+.58. 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