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	74	54	73%	6.9Hard	en
Jogurt	0.00	85	76	52	68%	7.6Hard	en
Prsteni	0.00	32	2822	2677	95%	1.6Easy	en
Sibice	0.00	50	14156	13555	96%	1.3Easy	en
Skener	0.00	42	5274	5049	96%	1.3Easy	en
Zbrka	0.01	154	215	171	80%	5.0Medium	en