Problems from Baltic Olympiad in Informatics 2017, Day 2

	Add	Remove

Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Cat in a tree	0.04	639	159	107	67%	6.8Hard	en
Friends	0.00	598	41	25	61%	7.8Hard	en
Plus Minus	0.03	433	98	82	84%	5.3Medium	en