Problems from Croatian Open Competition in Informatics 2008/2009, contest #3

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Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Binary search tree	0.01	161	2051	1033	50%	5.5Hard	en
Cross	0.00	1041	371	291	78%	4.2Medium	en
Kemija	0.00	26	5419	5119	94%	1.7Easy	en
Matrica	0.01	1210	34	22	65%	6.4Hard	en
Najkraci	0.34	1006	47	34	72%	6.9Hard	en
Pet	0.00	39	16930	16166	95%	1.3Easy	en