Author: Anurag Sahay
Divide the grid along the grid lines into regions so that no two regions with the same area share an edge. Each given clue must represent the area of the region it belongs to.
Grid control: To draw a cut click at the cell edge or move mouse along the line holding the button. You can also connect the centers of cells which belong to the same part with auxiliary line or put auxiliary digits in the grid. In this case cut lines will be added automatically. Auxiliary elements don't affect correctness of the solution. More details about grid control are at the help page.