Find the prime numbers in a vector
this problem is dank
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Rotate input square matrix 90 degrees CCW without rot90
Given a 4x4 matrix, swap the two middle columns
07 - Common functions and indexing 6
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