Sum the 'edge' values of an input matrix (the values along the perimeter).
Example
[1 2 3 4 5 6 7 8 9]
Output = 1 + 2 + 3 + 6 + 9 + 8 + 7 + 4 = 40;
Assumption: Input matrix equal or bigger than 3x3.
how does this work?
"find" can delete,do you agree?
Return the largest number that is adjacent to a zero
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Let's get back to school, and create multiplication tables
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