I keep timing out on Division and Union. Does anyone know what this line means?

To optimize testing process you will be given multitest.

I see that we're given all test inputs in a single batch, not sure if we're meant to parallelize our code based on that?

No. You’re not supposed to parallelize. Time limit is in the total CPU time consumed anyway, so parallelization would not help

ah, ty

Yes

got there in the end 🙂