Why is this submission so slow? D2. DFS Checker (Hard Version)

Revision en1, by neal, 2024-08-11 22:52:24

Can anyone tell me why this submission is so slow? 275858049

It's $$$\mathcal{O}(N + Q)$$$ and should be very fast, but somehow it takes 1125 ms.

Meanwhile my in-contest code that uses lots of sets and does a bunch of nonsense only takes 561 ms: 275858229

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en1 English neal 2024-08-11 22:52:24 345 Initial revision (published)