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
First non-zero element in each column
Multiply a column by a row
Multiply 2 numbers
UICBioE240 problem 1.18
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