From 8bdb3ff89d736deb56b0afde123d12180c2f287a Mon Sep 17 00:00:00 2001 From: Luke Hubmayer-Werner Date: Fri, 23 Dec 2022 16:24:41 +1030 Subject: [PATCH] 2022 Day 23 Python --- 2022/day23.py | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2022/input/23 | 73 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 159 insertions(+) create mode 100644 2022/day23.py create mode 100644 2022/input/23 diff --git a/2022/day23.py b/2022/day23.py new file mode 100644 index 0000000..b35257f --- /dev/null +++ b/2022/day23.py @@ -0,0 +1,86 @@ +from helpers import * +lines = read_day(23).split('\n') +sample_lines = ''' +....#.. +..###.# +#...#.# +.#...## +#.###.. +##.#.## +.#..#.. +'''.strip().split('\n') + +def get_intention(round, elves, x, y): + adj_nw = (x-1,y-1) in elves + adj_w = (x-1,y) in elves + adj_sw = (x-1,y+1) in elves + adj_n = (x,y-1) in elves + adj_s = (x,y+1) in elves + adj_ne = (x+1,y-1) in elves + adj_e = (x+1,y) in elves + adj_se = (x+1,y+1) in elves + if adj_nw or adj_n or adj_ne or adj_w or adj_e or adj_sw or adj_s or adj_se: + for i in range(4): + direction = (round + i) % 4 + if (direction == 0) and not (adj_n or adj_nw or adj_ne): + return (x,y-1) # move north + if (direction == 1) and not (adj_s or adj_sw or adj_se): + return (x,y+1) # move south + if (direction == 2) and not (adj_w or adj_nw or adj_sw): + return (x-1,y) # move west + if (direction == 3) and not (adj_e or adj_ne or adj_se): + return (x+1,y) # move east + return (x,y) # no movement + +def simulate(lines: list[str], rounds: int = 10) -> set[tuple[int,int]]: + # position = np.array([[c=='#' for c in line] for line in lines], dtype=np.bool8) + elves = set() + for row, line in enumerate(lines): + for col, c in enumerate(line): + if c == '#': + elves.add((col, row)) + + for round in range(rounds): + if round == 10: + print(f'*** Part 1: ground tiles after round #10: {get_rect(elves)} ***') + # else: + # print(f'\tground tiles before round #{round+1}: {get_rect(elves)}') + # print(f'performing round #{round+1}') + next_elves = {} + for x,y in sorted(elves, key=lambda p: (p[1], p[0])): + intention = get_intention(round, elves, x, y) + # print(f'{x,y} wants to move to {intention}') + next_elves[intention] = next_elves.get(intention, []) + [(x,y)] + old_elves = elves + elves = set() + for position, elf_intentions in next_elves.items(): + if len(elf_intentions) == 1: + elves.add(position) + else: + # print(f'conflict: {len(elf_intentions)} elves tried to move to {position}') + elves |= set(elf_intentions) # neither move + if old_elves == elves: + print(f'*** Part 2: No elves moved in round #{round+1} ***') + break + print(f'Final ground tiles: {get_rect(elves)}') + return elves + +def get_rect(elves: set[tuple[int,int]]): + x0, x1, y0, y1 = None, None, None, None + for x,y in elves: + if x0 is None or x < x0: + x0 = x + if x1 is None or x > x1: + x1 = x + if y0 is None or y < y0: + y0 = y + if y1 is None or y > y1: + y1 = y + # print(f'Elves in rectangle from x:{x0}~{x1}, y:{y0}~{y1}') + # for y in range(y0, y1+1): + # print(''.join(('#' if (x,y) in elves else '.' for x in range(x0,x1+1)))) + rect_size = (x1-x0+1)*(y1-y0+1) # inclusive + return rect_size - len(elves) + +simulate(sample_lines, 100) +simulate(lines, 100000) diff --git a/2022/input/23 b/2022/input/23 new file mode 100644 index 0000000..5307fc8 --- /dev/null +++ b/2022/input/23 @@ -0,0 +1,73 @@ +.##.#.....##.#.......#..#####....#####...#..###..#.#..#...#.##...###.##.# +....##..##..........##.#..#.##...#.#.#...##..#..#####.#..#..#.#..#..####. +#.####.##..##.##.#####.#####...#.....#...####..##.##..###..##..#####..#.. +..###.#.##....#.###.#..#####..##.####..###.####.######....###.#####...#.. +#.#..#..#....#...####.#.....##..#.###.....##.#.#...#.#.##.######.#.#...## +....##..####..#.#...##....##.#.#...##..##..#....#..####.#.#########.....# +.#.###.##....#####.###..#.#......#.####.#....#.######.##..##...#####.##.. 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