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| 1 | +#!/usr/bin/env python3 |
| 2 | + |
| 3 | +import sys |
| 4 | +import time |
| 5 | +from copy import deepcopy |
| 6 | +from pathlib import Path |
| 7 | + |
| 8 | +RED = "\033[31m" |
| 9 | +GREEN = "\033[32m" |
| 10 | +LIGHTRED = "\033[91m" |
| 11 | +LIGHTGREEN = "\033[92m" |
| 12 | +YELLOW = "\033[93m" |
| 13 | +BLUE = "\033[94m" |
| 14 | +RESET = "\033[0m" |
| 15 | +CLEAR = "\033[H\033[2J" |
| 16 | +DARK = "\033[1;30m" |
| 17 | + |
| 18 | + |
| 19 | +START = "S" |
| 20 | +SPLITTER = "^" |
| 21 | +BEAM = "|" |
| 22 | +EMPTY = "." |
| 23 | + |
| 24 | + |
| 25 | +def show(grid, seconds: float = 0.5, footer=None): |
| 26 | + sys.stdout.write(CLEAR) |
| 27 | + |
| 28 | + for row in grid: |
| 29 | + color = "" |
| 30 | + |
| 31 | + def pr(new_color: str, cell: str): |
| 32 | + nonlocal color |
| 33 | + if color != new_color: |
| 34 | + color = new_color |
| 35 | + sys.stdout.write(color) |
| 36 | + sys.stdout.write(cell) |
| 37 | + |
| 38 | + for cell in row: |
| 39 | + if cell == EMPTY: |
| 40 | + pr(DARK, EMPTY) |
| 41 | + elif cell == SPLITTER: |
| 42 | + pr(LIGHTGREEN, SPLITTER) |
| 43 | + elif cell == BEAM: |
| 44 | + pr(YELLOW, BEAM) |
| 45 | + elif cell == START: |
| 46 | + pr(LIGHTRED, START) |
| 47 | + else: |
| 48 | + print(cell) |
| 49 | + exit() |
| 50 | + |
| 51 | + print(RESET) |
| 52 | + |
| 53 | + if footer is not None: |
| 54 | + print() |
| 55 | + print(BLUE + f" {footer} ".center(width, "~") + RESET) |
| 56 | + |
| 57 | + time.sleep(seconds) |
| 58 | + |
| 59 | + |
| 60 | +grid = list(list(line) for line in Path("test.txt").read_text().splitlines()) |
| 61 | +width = len(grid[0]) |
| 62 | +height = len(grid) |
| 63 | +start_x = grid[0].index("S") |
| 64 | + |
| 65 | + |
| 66 | +def part1(): |
| 67 | + show(grid) |
| 68 | + |
| 69 | + beams = set([start_x]) |
| 70 | + splits = 0 |
| 71 | + |
| 72 | + for y in range(1, height): |
| 73 | + new_beams = set() |
| 74 | + |
| 75 | + for x in beams: |
| 76 | + if grid[y][x] == SPLITTER: |
| 77 | + splits += 1 |
| 78 | + if x > 0: |
| 79 | + new_beams.add(x - 1) |
| 80 | + if x < width - 1: |
| 81 | + new_beams.add(x + 1) |
| 82 | + else: |
| 83 | + new_beams.add(x) |
| 84 | + |
| 85 | + beams = new_beams |
| 86 | + |
| 87 | + for x in beams: |
| 88 | + grid[y][x] = BEAM |
| 89 | + |
| 90 | + show(grid, footer=splits) |
| 91 | + |
| 92 | + |
| 93 | +def part2(grid, x: int, y: int, count: int): |
| 94 | + if y == height: |
| 95 | + count += 1 |
| 96 | + show(grid, 0.25, count) |
| 97 | + return count |
| 98 | + |
| 99 | + new_grid = deepcopy(grid) |
| 100 | + |
| 101 | + show(new_grid, 0.005, count) |
| 102 | + |
| 103 | + if grid[y][x] == SPLITTER: |
| 104 | + if x > 0: |
| 105 | + count = part2(new_grid, x - 1, y, count) |
| 106 | + if x < width - 1: |
| 107 | + count = part2(new_grid, x + 1, y, count) |
| 108 | + else: |
| 109 | + new_grid[y][x] = BEAM |
| 110 | + count = part2(new_grid, x, y + 1, count) |
| 111 | + |
| 112 | + return count |
| 113 | + |
| 114 | + |
| 115 | +try: |
| 116 | + if len(sys.argv) < 2: |
| 117 | + show(grid, 0, "hello") |
| 118 | + elif sys.argv[1] == "1": |
| 119 | + part1() |
| 120 | + elif sys.argv[1] == "2": |
| 121 | + part2(grid, start_x, 1, 0) |
| 122 | +except KeyboardInterrupt: |
| 123 | + pass |
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