tile-grouping.py

def add_adjacent_tiles(grid, room, x, y):
    room.append((x, y))
    grid[x][y] = 'C'
    adjacent_tile_positions = [(x + 1, y), (x - 1, y), (x, y + 1), (x, y - 1)]
    for (x, y) in adjacent_tile_positions:
        if x < len(grid) and y < len(grid[x]) and grid[x][y] == 'R':
            add_adjacent_tiles(grid, room, x, y)
    return tiles

def group_tiles_to_rooms(grid):
    rooms = []
    for x in range(len(grid)):
        for y in range(len(grid[x])):
            if grid[x][y] == 'R':
                room = []
                add_adjacent_tiles(grid, room, x, y)
                rooms.append(room)
    return rooms


grid = list(map(lambda x: list(x), """
0RRRROOOOOOOOOOO
ORRRO0000OO00OOO
ORR0O00RRR000OOO
OOORRRRRRROO0OOO
OOOOOOORROOO0000
""".strip().split("\n")))
print(group_tiles(grid))