input = 123456789, output = 1+2+3+4+5+6+7+8+9 = 45
Does the size of the solution include the size of functions that have been called?
Right and wrong
Back to basics - mean of corner elements of a matrix
Change matrix to vector
Replace Negative(-) by 0 and positive by 1
determine the sum of the squares
concatenate the elements
No more zeros
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