Problems from Croatian Open Competition in Informatics 2008/2009, contest #4

	Add	Remove

Name	Fastest	Shortest	Total	Acc.	Ratio	Difficulty	Languages
Datum	0.00	5	10151	5942	59%	1.6Easy	en
Mjehuric	0.00	69	8425	4443	53%	1.6Easy	en
Periodni	0.00	1578	84	28	33%	6.3Hard	en
Rot	0.00	340	519	208	40%	3.1Medium	en
Slikar	0.01	1082	182	81	45%	4.5Medium	en
Trezor	0.00	990	86	20	23%	5.7Hard	en