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
Check to see if a Sudoku Puzzle is Solved
Sum the Infinite Series II
Return unique values without sorting
How many palindromes?
Restricted Multiplication v1
Restricted Addition v2
Test Driven Solution - Probability Problem 2
Restricted Addition v1
Restricted Subtraction v1
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