Really fun problem, but the test case is totally wrong. :-(
glad you liked the problem, but the test case is correct just obfuscated.
Back to basics 8 - Matrix Diagonals
Sum the numbers on the main diagonal
Free passes for everyone!
Is this number Munchhausen Narcissistic?
Convert vector datasets to plot with imagesc instead of scatter
remove nans fast
is the number happy?
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