Dissection
Divide the above figure into three congruent pieces along the grid lines. Enter your answer as the cells that make up the region containing the cell 1 in increasing order, concatenating them all.
As an example, the following is a puzzle and its solution. The answer in this case would be 1248, because the region containing the cell 1 is made up of cells 1, 2, 4, 8.
The answer is 12345111819.
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1 solution
The solution is as follows. The region containing the cell 1 is made up of the cells 1, 2, 3, 4, 5, 11, 18, 19.