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
Distance walked 2D
Matrix indexing with two vectors of indices
Determine Whether an array is empty
Cell Counting: How Many Draws?
07 - Common functions and indexing 4
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