I said all in title :)
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cool prob
very nice problem! none of the individual observations were too hard, so it was good for a not particularly skilled person like myself with ample thinking time :p
abc346f
ABC395D probably, because the 3 mappings it constructed is quite subtle and requires more logical reasoning than an average 350-point problem.
probably this one, because i solved it with hashing, and that's pretty cool
ARC110E,AGC021E,ARC156F and AGC059F. They are absolutely beautiful problems.
wtf
This: ABC405_F
By the way, there were some cool problems where solution used maximum flow optimizations and was linear or n log n at the end but I lost these problems. Does someone remember them?