length!! and not "not isempty"... good point!
Determine Whether an array is empty
String substitution, sub problem to cryptoMath
Make a run-length companion vector
Length of the hypotenuse
Binary code (array)
Permute diagonal and antidiagonal
Chess ELO rating system
Getting the indices from a matrice
Rank of magic square (for beginners)
Longest Collatz Sequence
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