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11.py
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11.py
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import copy
import fileinput
original_layout = [line.replace('\n', '') for line in fileinput.input()]
rows = len(original_layout)
cols = len(original_layout[0])
directions = [(-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)]
def num_occupied_adjacent_seats(layout, row, col):
adjacent_occupied_counter = 0
for direction in directions:
search_row = row + direction[0]
search_col = col + direction[1]
if not 0 <= search_row < rows or not 0 <= search_col < cols:
continue
adjacent_occupied_counter += layout[search_row][search_col] == '#'
return adjacent_occupied_counter
def num_occupied_visible_seats(layout, row, col):
occupied_visible = 0
for direction in directions:
for distance in range(1, rows):
travel = tuple(i * distance for i in direction)
search_row = row + travel[0]
search_col = col + travel[1]
if not 0 <= search_row < rows or not 0 <= search_col < cols:
continue
if layout[search_row][search_col] == '#':
occupied_visible += 1
if layout[search_row][search_col] != '.':
break
return occupied_visible
def iterate(layout, f, tolerance):
new_layout = copy.deepcopy(layout)
seats_moved = False
for col in range(cols):
for row in range(rows):
visible_neighbours = f(layout, row, col)
if layout[row][col] == 'L' and not visible_neighbours:
new_layout[row] = new_layout[row][:col] + '#' + new_layout[row][col+1:]
seats_moved = True
if layout[row][col] == '#' and visible_neighbours >= tolerance:
new_layout[row] = new_layout[row][:col] + 'L' + new_layout[row][col+1:]
seats_moved = True
return new_layout, seats_moved
def run(count_fn, threshold):
layout = copy.deepcopy(original_layout)
while True:
layout, seats_moved = iterate(layout, count_fn, threshold)
if not seats_moved:
break
return sum([layout[y][x] == '#' for y in range(rows) for x in range(cols)])
def part1():
return run(num_occupied_adjacent_seats, 4)
def part2():
return run(num_occupied_visible_seats, 5)
print(part1())
print(part2())