Hi to F solvers that got stuck on D ):
Seems like graph algorithms are much harder than topics taught in universities for you. Honestly Gaussian elimination is still hard for me, maybe that`s why I am still a specialist, what is your secret? 
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Auto comment: topic has been updated by Malek__ (previous revision, new revision, compare).
would say gaussian elimination is a rather trivial subject, anyone with a rating of at least 1200 should know it.
So, I will learn it tomorrow. Do you know any sources? (AI engines are preferred /:)
yeah in the next contest use a llm, it'll help you out
Ah shit here go again ... For the new generation of competitive programmers, Gaussian elimination is as obvious as a greedy algorithm. With these elites, we no longer need to fear AI overtaking humans.
I've never used Gaussian elimination in my life, and I can't recall any problem that would require it. I don't think it's the fault of the new generation.
Not wanting to defend cheaters, but a problem that is basically applying Gaussian elimination is much easier than a problem that requires building a graph and doing some hard observations on it. Especially considering Gaussian elimination is a well know problem and there is plenty of code online for that.
imo the problem is not just "apply gaussian elimination". There is still some thinking required to reduce the problem to this (and the most natural way to solve the problem, once you reduced it, is to use xor basis)