Nonogram Encode

Nonogram Encode


I believe you love the picture logic puzzles called nonograms and have solved many of them. This mission is the opposite: you already have a binary image, formed by strings of equal length, where a background empty cell contains whitespace and a picture cell contains 'X'.

Your goal is to create a nonogram based upon the image: write number clues for solving the image like it was hidden. Your function should return a list of two lists. The first one consists of lists with numbers for the columns' clues and the second one contains the same for the rows' clues. All lists of the columns' clues, as well as of the rows' clues, should be of the same 'depth' (complemented with 0). Let's see an example:

example = [' X X ',
           'X X X', 
           ' X X ']
Example with solution to see the whole idea:

    columns clue 01010
rows clue 0 1 1 ' X X '
          1 1 1 'X X X'
          0 1 1 ' X X '
So, for this example your function should return the following:

result = [[[0, 1, 0, 1, 0],
           [1, 1, 1, 1, 1]],
          [[0, 1, 1],
           [1, 1, 1],
           [0, 1, 1]]]
# the same, non formatted view
[[[0, 1, 0, 1, 0], [1, 1, 1, 1, 1]], [[0, 1, 1], [1, 1, 1], [0, 1, 1]]]

Input: List of strings.

Output: List of 2 lists.


assert nonogram_encode([" X X ", "X X X", " X X "]) == [
    [[0, 1, 0, 1, 0], [1, 1, 1, 1, 1]],
    [[0, 1, 1], [1, 1, 1], [0, 1, 1]],
assert nonogram_encode(["X"]) == [[[1]], [[1]]]

How it’s used: Helps you when you decide to create your own type of picture logic puzzle.


  • len(data[i]) == len(data[0]);
  • set(data[i]) == set([' ', 'X']);
  • for lists in output: len(list[i]) == len(list[0]).

Invalid hot key. Each hot key should be unique and valid
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CheckiO Extensions

CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

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pip3 install checkio_client

Configure your tool

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checkio serv -d

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checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium

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