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

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Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Datum	0.00	28	5897	5658	96%	1.6Easy	en
Mjehuric	0.00	69	4327	4093	95%	1.6Easy	en
Periodni	0.00	1578	21	12	57%	7.3Hard	en
Rot	0.00	340	213	185	87%	3.1Medium	en
Slikar	0.01	1082	62	50	81%	4.6Medium	en
Trezor	0.00	990	29	20	69%	5.7Hard	en