treetops.py

def get_visible_indexes(sequence: list[int]) -> list[int]:
    running_max = -1
    for index, value in enumerate(sequence):
        if value > running_max:
            running_max = value
            yield index
            
def parse_inputs(text: str) -> list[list[int]]:
    return [[int(value) for value in line] for line in text.splitlines()]

def execute_part_1(parsed: list[list[int]]) -> Any:
    dimx, dimy = len(parsed), len(parsed[0])

    forward_horizontal_visibles = set(
        (x, visible_index_y)
        for x, line in enumerate(parsed)
        for visible_index_y in get_visible_indexes(line)
    )

    backward_horizontal_visibles = set(
        (x, dimy - visible_index_y - 1)
        for x, line in enumerate(parsed)
        for visible_index_y in get_visible_indexes(line[::-1])
    )

    forward_vertical_visibles = set(
        (visible_index_x, y)
        for y in range(dimy)
        for visible_index_x in get_visible_indexes([line[y] for line in parsed])
    )

    backward_vertical_visibles = set(
        (dimx - visible_index_x - 1, y)
        for y in range(dimy)
        for visible_index_x in get_visible_indexes([line[y] for line in parsed[::-1]])
    )

    return len(forward_horizontal_visibles | backward_horizontal_visibles | forward_vertical_visibles | backward_vertical_visibles)

with open("inputs.txt", "r") as f:
    text = f.read()
    
parsed = parse_inputs(text)

print(execute_part_1(parsed))