# Filling

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This mission is an adaptation of the "Filling" game (from Simon Tatham's Portable Puzzle Collection ). If you are lost or just want to play, the game is available here .

You have a rectangular grid with digits. You have to fill the grid with digits in such a way that each connected region (diagonally separated squares are not adjacent) of identical digits has an area equal to that common digit.

Empty cells are represented by zeros.

Note: It is possible that the solution grid contains regions without that none of its cells were given in the input grid (such as the 3s and a 1 in the first example).

```

[[0, 2, 0],  ===\  [[2, 2, 1],
[0, 0, 2],  ===/   [3, 3, 2],
[0, 1, 0]]         [3, 1, 2]]

[[1, 0, 1, 0, 1, 4, 0, 0],       [[1, 3, 1, 3, 1, 4, 4, 4],
[3, 0, 2, 3, 0, 0, 0, 4],        [3, 3, 2, 3, 3, 5, 5, 4],
[0, 0, 0, 1, 0, 0, 5, 1],  ===\  [4, 4, 2, 1, 5, 5, 5, 1],
[4, 0, 1, 3, 0, 1, 0, 0],  ===/  [4, 4, 1, 3, 3, 1, 8, 8],
[5, 0, 0, 0, 0, 0, 0, 8],        [5, 5, 5, 2, 3, 8, 8, 8],
[0, 0, 1, 2, 1, 0, 0, 0]]        [5, 5, 1, 2, 1, 8, 8, 8]]
```

Input: A list of lists of integers.

Output: A list/tuple of lists/tuples of integers.

Examples:

`filling([[0, 2, 0], [0, 0, 2], [0, 1, 0]]) == [[2, 2, 1],...`
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In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

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Alternatevly, you can install Chrome extension or FF addon

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Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.