Kind of tailored to the orders of magnitude approach of the test suite; complexity would have to increase significantly if you split the intervals say [10000 50000] instead of [1e4 1e5-1].
Everything is perfect in this code.
this is not really a general solution, perhaps you could add more complicated cases in the testsuite? for example pandigital_nb(2200,4000)==10, pandigital_nb(250,40000)==98, pandigital_nb(35327,43854637)==23030
I hesitated to add tests that I can't solve by myself.
I see, check solution 443089, that should be a general and relatively fast solution
Specific Element Count
middleAsColumn: Return all but first and last element as a column vector
I've got the power! (Inspired by Project Euler problem 29)
Area of an equilateral triangle
Chess ELO rating system
Add more zeros
Find indices of diagonal elements
Decrypt the cypher using XOR encryption (for beginners)
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