What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Stuff the Board
Given a 4x4 matrix, swap the two middle columns
Calculate the derivative of a polynomial
convert matrix to single column
Numbers spiral diagonals
Divisors for big integer
Clear all empty variables from the workspace
Find Missing Number
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