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
Sum the 'edge' values of a matrix
A SUBSREF variant that accepts the 'end'-operator.
Order of things - 3
Wayfinding 1 - crossing
Add a row of zeros on top of a matrix
Wayfinding 2 - traversing
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