What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Better bullseye matrix
Back to basics 22 - Rotate a matrix
Arrange vector in ascending order
Return area of square
Getting the indices from a matrice
Numbers spiral diagonals (Part 2)
Find files with extension ext in the current directory
Numbers spiral diagonals (Part 1)
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