Extract leading non-zero digit
Specific Element Count
Is this matrix orthogonal?
Add more zeros
GJam: 2013 China Event: Cannon Angle
Skyscrapers - Puzzle
GJam 2016 Rd1A: Rank and File (Large)
Kaggle: Reverse Game of Life - Single Move to One Cell Case
Kaggle: Reverse Game of Life - Periods of Oscillators
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