Problems from Croatian Open Competition in Informatics 2006/2007, contest #4

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Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Ispiti	0.06	1400	76	57	75%	6.1Hard	en
Jogurt	0.00	85	81	57	70%	7.0Hard	en
Prsteni	0.00	32	2841	2695	95%	1.6Easy	en
Sibice	0.00	50	14300	13690	96%	1.4Easy	en
Skener	0.00	42	5408	5183	96%	1.3Easy	en
Zbrka	0.01	154	218	175	80%	4.9Medium	en