No, you don't read it wrong: this assignment is to return the number of this problem (and not the problem of this number).
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Triangle Numbers Below N
Insert zeros into vector
Calculate the derivative of a polynomial
Wayfinding n - Avoid linear obstacles
Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...
Wayfinding 2 - traversing
Add a row of zeros on top of a matrix
Mmm! Multi-dimensional Matrix Multiplication
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