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
Maximum running product for a string of numbers
Summing Digits within Text
Is my wife right?
Angle between Two Vectors
Restricted Addition v4
Restricted Subtraction v1
Restricted Addition v3
Test Driven Solution - Probability Problem 1
Test Driven Solution - Probability Problem 2
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