task: Закрась все клетки вдоль стены-уголка: сначала вниз, потом вправо. Стены каждый раз разной длины.

+---+---+---+---+---+---+---+---+---+
|                                   |
+   +   +   +   +   +   +   +   +   +
|   |v.                             |
+   +   +   +   +   +   +   +   +   +
|   | .                             |
+   +   +   +   +   +   +   +   +   +
|   | .                             |
+   +   +   +   +   +   +   +   +   +
|   | .                             |
+   +   +   +   +   +   +   +   +   +
|   | .   .   .   .   .   .         |
+   +---+---+---+---+---+---+   +   +
|                                   |
+---+---+---+---+---+---+---+---+---+

+---+---+---+---+---+---+---+---+---+---+
|       |v.                             |
+   +   +   +   +   +   +   +   +   +   +
|       | .                             |
+   +   +   +   +   +   +   +   +   +   +
|       | .                             |
+   +   +   +   +   +   +   +   +   +   +
|       | .   .   .   .   .   .   .     |
+   +   +---+---+---+---+---+---+---+   +
|                                       |
+   +   +   +   +   +   +   +   +   +   +
|                                       |
+---+---+---+---+---+---+---+---+---+---+

+---+---+---+---+---+---+---+---+
|                               |
+   +   +   +   +   +   +   +   +
|                               |
+   +   +   +   +   +   +   +   +
|           |v.                 |
+   +   +   +   +   +   +   +   +
|           | .                 |
+   +   +   +   +   +   +   +   +
|           | .                 |
+   +   +   +   +   +   +   +   +
|           | .                 |
+   +   +   +   +   +   +   +   +
|           | .   .   .         |
+   +   +   +---+---+---+   +   +
|                               |
+---+---+---+---+---+---+---+---+

+---+---+---+---+---+---+---+---+---+---+---+
|                                           |
+   +   +   +   +   +   +   +   +   +   +   +
|   |v.                                     |
+   +   +   +   +   +   +   +   +   +   +   +
|   | .                                     |
+   +   +   +   +   +   +   +   +   +   +   +
|   | .   .   .   .   .   .   .   .   .     |
+   +---+---+---+---+---+---+---+---+---+   +
|                                           |
+---+---+---+---+---+---+---+---+---+---+---+
