Square a number
I would recommend more test cases, including some of matrices.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Most nonzero elements in row
Implement a ROT13 cipher
Distance walked 1D
Return the first and last character of a string
Matlab Basics II - Create a vector with a repeated entry
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