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
Rotate input square matrix 90 degrees CCW without rot90
Magic is simple (for beginners)
Sum of first n positive integers
Height of a right-angled triangle
Numbers spiral diagonals (Part 1)
Pandigital number n°1 (Inspired by Project Euler 32)
Add more zeros
Find Missing Number
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