Where is this magic ICPC competition answers database that they're using?

"Database" was not meant in a literal sense. Clearly a lot of knowledge from similar problems is encoded in the model, that is why you can use models as a kind of fuzzy encyclopedia.

It is like an open book exam for humans where they also can lookup similar problems.

The current top comment makes the same point, but in a more diplomatic and sophisticated manner.

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chpatrick 5 days ago | parent [-]

I mean strong human contestants would also know a lot of similar problems, I'm not seeing how it's fundamentally different or not a meaningful achievement.

	▲	JohnKemeny 14 hours ago \| parent [-]
		Do you also think that IBM Watson won Jeopardy primarily because of its ability to reason? Or due to its massive internal database combined with superhuman button pressing skills?