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
Back to basics 14 - Keywords
Convert a vector into a number
Duplicate each element of a vector.
Create a vector
Wayfinding 4 - Crossing, level 2
Wayfinding n - Avoid linear obstacles
Bleed non-zeros to the right
Wayfinding 6 - Self-intersecting contours
Order of things - 3
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