ЯсноПонятно24

This code snippet appears to describe a loop that moves along a wall from top to bottom, filling cells as it goes. It checks if the cell is filled, and if so, it moves down and fills the cell until it reaches a wall from the bottom. It then moves back up until it reaches a wall from the top.

If there is a wall from the right, the loop breaks. Otherwise, it continues moving to the right.

It seems to be a simple algorithm for filling cells in a grid while moving along a wall.