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
Find common elements in matrix rows
Who knows the last digit of pi?
Return the Fibonacci Sequence
Determine Whether an array is empty
Deleting an element in a matrix
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