nice (and difficult) problem! (if possible, please fix the testsuite adding something along the lines of "assert(n==numel(unique(c)))")
example of invalid solution
Back to basics 8 - Matrix Diagonals
Mr. Pyramidad & Ms. Whissy Bolower
Augmented Lagrange Multiplier (ALM) Method
middleAsColumn: Return all but first and last element as a column vector
Is this is a Tic Tac Toe X Win?
Restricted Addition v4
Restricted Addition v1
Restricted Addition v3
Test Driven Solution - Probability Problem 2
Restricted Subtraction v1
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