This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Replace NaNs with the number that appears to its left in the row.
Matrix indexing with two vectors of indices
Reverse the elements of an array
select the primes of a vector
Find the area of a triangle
prime test 2
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