The length of an empty array is 0 not . ;-)
Sorry for that.. fixed it.. :)
Replace NaNs with the number that appears to its left in the row.
Longest Divisor Run
Similar Triangles - find the height of the tree
Duplicate each element of a vector.
Construct a precedence graph from a code segment
self description 2.0
Calculate the h-index
longest common substring : Skipped character version
Fermat's last theorem - again
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