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
Find best placement for ordered dominoes (harder)
Find a Pythagorean triple
Predicting life and death of a memory-less light bulb
Van Eck's Sequence's nth member
BLOCK x3 (Version 3)
Rank of magic square (for beginners)
Add more zeros
Find files with extension ext in the current directory
Getting the indices from a matrice
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