Someone (handle — eat_sleep_flirt_repeat) sent me solution (not sure correct or not) of problem B of round 665 in talks while contest was running. And I don't even know that person. 
Now I am not sure what I should do so I am writing this as a blog. Please help me.
EDIT : another thing, I didn't noticed that during the contest and I didn't use the solution.
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Don't read messages when contest is running.
fkn genius
I think, messaging someone feature should be disabled during a contest
Why though? It will not solve anything. If a bunch of cheaters wants to cooperate, there are plenty of other ways
On the other hand I don't see a problem with grandmasters exchanging nudes with messages while solving div2 contest
That also happened to me...
Tourist sent me solution during contest
Plz help lmfao