This problem's test cases seem buggy
I\'ve noticed that Python "Expected" outputs sometimes includes null. This is clearly wrong. Example:\n[[0,1,1],[0,2,1],[3,2,1],[3,1,1],[0,0,3],[0,1,2],[3,0,3],
I\'ve noticed that Python "Expected" outputs sometimes includes null. This is clearly wrong. Example:\n```[[0,1,1],[0,2,1],[3,2,1],[3,1,1],[0,0,3],[0,1,2],[3,0,3],[3,1,2],[0,2,2],[3,2,2],null,[1,2,1],[4,2,1],[4,1,1],[4,0,3],[4,1,2],[4,2,2],[2,0,3],[2,1,2],[2,2,2],[1,1,1],[1,0,3],[1,1,2],[1,2,2]]```\n\nI\'m not sure if there are additional bugs as well.
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