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
Remove all the consonants
Back to basics 23 - Triangular matrix
Stuff the Board
Permute diagonal and antidiagonal
Find last zero for each column
Decrypt the cypher using XOR encryption (for beginners)
Mysterious digits operation (easy)
Find my secret number
Add more zeros
Getting the indices from a matrice
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