IDE works, but submission gives me a runtime error

I wrote a Python script for easy challenge PRIME1. It runs fine in the IDE but gives me a Runtime Error(OTHER) when I submit the solution. Presumably the IDE uses a different input file. Since I can’t see either, where can I start debugging? Or is the answer “in the real world you have no access to the input, so here too you must learn to debug blind?”

:slight_smile:

Maybe start with the most extreme testcase that fits the constraints? Something like:

1
999900000 1000000000

I guess.

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