What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Which doors are open?
Similar Triangles - find the height of the tree
Basic arrays operations.
Check that number is whole number
BLOCK x3 (Version 3)
Chess ELO rating system
How to reverse spdiags ?
Can you beat the lottery again (for hardcore coder) ?
Numbers spiral diagonals (Part 2)
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