Problems from Baltic Olympiad in Informatics 2017, Day 2

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Cat in a tree	0.04	639	574	139	24%	6.9Hard	en
Friends	0.00	598	431	82	19%	6.4Hard	en
Plus Minus	0.03	589	360	108	30%	5.2Medium	en