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
Arrange vector in ascending order
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
Matrix multiplication across rows
Convert radians to degrees
Mysterious digits operation (easy)
Magic is simple (for beginners)
Permute diagonal and antidiagonal
Mirror, mirror on the wall, who is fairest of them all?
BLOCK x3 (Version 3)
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