What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
give nth decimal place of pi
vectorization in N
Return unique values without sorting
Compute a dot product of two vectors x and y
Relative ratio of "1" in binary number
Numbers spiral diagonals
Return a list sorted by number of consecutive occurrences
Numbers spiral diagonals (Part 2)
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