That's a beautiful image.
The answer for the first image is wrong. It should be 54784197.
If one looks at the answer set, he/she will see people having been bypassing the first test by fixing the answer. The test cases should be fixed to calculate the sum dynamically with some function forbidden to the user.
Times 2 - START HERE
Sum of diagonal of a square matrix
Convert hex color specification to MATLAB RGB
"Low : High - Low : High - Turn around " -- Create a subindices vector
Output any real number that is neither positive nor negative
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