Ugly day 22.
This commit is contained in:
Mikaël Capelle
parent
72ffd399b3
commit
dd88a1838d
204
2022/day22.py
204
2022/day22.py
@ -2,14 +2,15 @@
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import re
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import sys
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from typing import Callable
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import numpy as np
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VOID = 0
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EMPTY = 1
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WALL = 2
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VOID, EMPTY, WALL = 0, 1, 2
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TILE_FROM_CHAR = {" ": VOID, ".": EMPTY, "#": WALL}
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SCORES = {"E": 0, "S": 1, "W": 2, "N": 3}
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board_map_s, direction_s = sys.stdin.read().split("\n\n")
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@ -27,23 +28,6 @@ directions = [
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int(p1) if p2 else p1 for p1, p2 in re.findall(R"(([0-9])+|L|R)", direction_s)
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]
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invert = False
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y0 = 0
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x0 = np.where(board[0] == EMPTY)[0][0]
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r0 = "E"
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if invert:
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board = board[::-1, ::-1]
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y0 = board.shape[0] - 1
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x0 = np.where(board[-1, :] == EMPTY)[0][-1]
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r0 = "W"
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# print(
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# "\n".join(
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# "".join(next(k for k, v in TILE_FROM_CHAR.items() if v == c) for c in row)
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# for row in board
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# )
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# )
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# find on each row and column the first and last non-void
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row_first_non_void = np.argmax(board != VOID, axis=1)
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@ -52,6 +36,75 @@ col_first_non_void = np.argmax(board != VOID, axis=0)
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col_last_non_void = board.shape[0] - np.argmax(board[::-1, :] != VOID, axis=0) - 1
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faces = np.zeros_like(board)
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size = np.gcd(board.shape[0], board.shape[1])
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for row in range(0, board.shape[0], size):
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for col in range(row_first_non_void[row], row_last_non_void[row], size):
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faces[row : row + size, col : col + size] = faces.max() + 1
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SIZE = np.gcd(*board.shape)
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# TODO: deduce this from the actual cube...
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faces_wrap: dict[int, dict[str, Callable[[int, int], tuple[int, int, str]]]]
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if board.shape == (12, 16): # example
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faces_wrap = {
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1: {
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"W": lambda y, x: (4, 4 + y, "S"), # 3N
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"N": lambda y, x: (4, 11 - x, "S"), # 2N
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"E": lambda y, x: (11 - y, 15, "W"), # 6E
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},
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2: {
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"W": lambda y, x: (11, 19 - y, "N"), # 6S
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"N": lambda y, x: (0, 11 - y, "S"), # 1N
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"S": lambda y, x: (11, 11 - x, "N"), # 5S
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},
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3: {
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"N": lambda y, x: (x - 4, 8, "E"), # 1W
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"S": lambda y, x: (15 - x, 8, "E"), # 5W
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},
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4: {"E": lambda y, x: (8, 19 - y, "S")}, # 6N
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5: {
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"W": lambda y, x: (7, 15 - y, "N"), # 3S
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"S": lambda y, x: (7, 11 - x, "N"), # 2S
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},
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6: {
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"N": lambda y, x: (19 - x, 11, "W"), # 4E
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"E": lambda y, x: (11 - y, 11, "W"), # 1E
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"S": lambda y, x: (19 - x, 0, "E"), # 2W
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},
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}
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else:
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faces_wrap = {
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1: {
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"W": lambda y, x: (3 * SIZE - y - 1, 0, "E"), # 4W
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"N": lambda y, x: (2 * SIZE + x, 0, "E"), # 6W
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},
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2: {
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"N": lambda y, x: (4 * SIZE - 1, x - 2 * SIZE, "N"), # 6S
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"E": lambda y, x: (3 * SIZE - y - 1, 2 * SIZE - 1, "W"), # 5E
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"S": lambda y, x: (x - SIZE, 2 * SIZE - 1, "W"), # 3E
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},
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3: {
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"W": lambda y, x: (2 * SIZE, y - SIZE, "S"), # 4N
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"E": lambda y, x: (SIZE - 1, SIZE + y, "N"), # 2S
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},
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4: {
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"W": lambda y, x: (3 * SIZE - y - 1, SIZE, "E"), # 1W
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"N": lambda y, x: (SIZE + x, SIZE, "E"), # 3W
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},
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5: {
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"E": lambda y, x: (3 * SIZE - y - 1, 3 * SIZE - 1, "W"), # 2E
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"S": lambda y, x: (2 * SIZE + x, SIZE - 1, "W"), # 6E
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},
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6: {
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"W": lambda y, x: (0, y - 2 * SIZE, "S"), # 1N
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"E": lambda y, x: (3 * SIZE - 1, y - 2 * SIZE, "N"), # 5S
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"S": lambda y, x: (0, x + 2 * SIZE, "S"), # 2N
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},
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}
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def wrap_part_1(y0: int, x0: int, r0: str) -> tuple[int, int, str]:
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if r0 == "E":
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return y0, row_first_non_void[y0], r0
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@ -66,100 +119,29 @@ def wrap_part_1(y0: int, x0: int, r0: str) -> tuple[int, int, str]:
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def wrap_part_2(y0: int, x0: int, r0: str) -> tuple[int, int, str]:
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if r0 == "E":
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if y0 in range(0, 4):
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y0 = board.shape[0] - y0 - 1
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return y0, row_last_non_void[y0], "W"
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elif y0 in range(4, 8):
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print(x0, row_last_non_void[8], row_last_non_void[8] - (y0 - 4))
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x0 = row_last_non_void[8] - (y0 - 4)
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return col_first_non_void[x0], x0, "S"
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else:
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y0 = board.shape[0] - y0 - 1
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return y0, row_last_non_void[y0], "W"
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elif r0 == "S":
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if x0 in range(0, 4):
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y0 = board.shape[0] - 1
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return y0, row_first_non_void[y0] + 3 - x0, "N"
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elif x0 in range(4, 8):
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y0 = col_last_non_void[x0] + 8 - x0
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return y0, row_first_non_void[y0], "E"
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elif x0 in range(8, 12):
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# 8 -> 3, 9 -> 2
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x0 = board.shape[0] - x0 - 1
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return col_last_non_void[x0], x0, "N"
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else:
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y0 = col_first_non_void[0] + board.shape[1] - x0 - 1
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return y0, row_first_non_void[y0], "W"
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elif r0 == "W":
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if y0 in range(0, 4):
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x0 = 4 + y0
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return col_first_non_void[x0], x0, "S"
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elif y0 in range(4, 8):
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x0 = board.shape[1] - (y0 - 4) - 1
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return board.shape[0] - 1, x0, "N"
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else:
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x0 = 4 + board.shape[0] - y0 - 1
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return col_last_non_void[x0], x0, "N"
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elif r0 == "N":
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if x0 in range(0, 4):
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cube = faces[y0, x0]
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assert r0 in faces_wrap[cube]
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return faces_wrap[cube][r0](y0, x0)
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def run(wrap: Callable[[int, int, str], tuple[int, int, str]]) -> tuple[int, int, str]:
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y0 = 0
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return y0, row_first_non_void[y0] + 3 - x0, "S"
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elif x0 in range(4, 8):
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y0 = x0 - 4
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return y0, row_first_non_void[y0], "E"
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elif x0 in range(8, 12):
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x0 = 11 - x0
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return col_first_non_void[x0], x0, "S"
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else:
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y0 = 4 + board.shape[0] - x0 - 1
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return y0, row_last_non_void[y0], "W"
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assert False
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# for i in range(4):
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# print(wrap_part_2(i, 8 + i - 1, "E"))
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# exit()
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wrap = wrap_part_2
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# directions = directions[:5]
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print(y0, x0, r0)
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facing = np.zeros_like(board, dtype=str)
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facing.fill(" ")
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facing[board != VOID] = "."
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facing[board == WALL] = "#"
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for direction in directions:
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# print(f"{y0} {x0} {r0} ({direction})")
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# r1 = {"N": "S", "S": "N", "W": "E", "E": "W"}[r0]
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# print(f"{board.shape[0] - y0 - 1} {board.shape[1] - x0 - 1} {r1} ({direction})")
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facing[y0, x0] = {"E": ">", "W": "<", "N": "^", "S": "v"}[r0]
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x0 = np.where(board[0] == EMPTY)[0][0]
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r0 = "E"
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for direction in directions:
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if isinstance(direction, int):
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while direction > 0:
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if r0 == "E":
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xi = np.where(board[y0, x0 + 1 : x0 + direction + 1] == WALL)[0]
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# if y0 == 12 and x0 == 81:
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# print(
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# xi,
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# board[y0, x0 + 1 : x0 + direction],
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# board[y0, x0 + direction],
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# )
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if len(xi):
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# print("E1")
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x0 = x0 + xi[0]
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direction = 0
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elif (
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x0 + direction < board.shape[1]
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and board[y0, x0 + direction] == EMPTY
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):
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# print("E2")
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x0 = x0 + direction
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direction = 0
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else:
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@ -231,19 +213,13 @@ for direction in directions:
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"S": {"L": "E", "R": "W"},
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}[r0][direction]
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facing[y0, x0] = {"E": ">", "W": "<", "N": "^", "S": "v"}[r0]
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return y0, x0, r0
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print("\n".join(map("".join, facing)))
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if invert:
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print(y0, x0, r0, "->", end=" ")
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x0, y0, r0 = (
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board.shape[1] - x0 - 1,
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board.shape[0] - y0 - 1,
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{"N": "S", "S": "N", "W": "E", "E": "W"}[r0],
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)
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print(y0, x0, r0)
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score = {"E": 0, "S": 1, "W": 2, "N": 3}
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answer_1 = 1000 * (1 + y0) + 4 * (1 + x0) + score[r0]
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y1, x1, r1 = run(wrap_part_1)
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answer_1 = 1000 * (1 + y1) + 4 * (1 + x1) + SCORES[r1]
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print(f"answer 1 is {answer_1}")
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y2, x2, r2 = run(wrap_part_2)
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answer_2 = 1000 * (1 + y2) + 4 * (1 + x2) + SCORES[r2]
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print(f"answer 2 is {answer_2}")
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