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	2229	1177	53%	4.8Medium	en
Cross	0.00	1041	374	292	78%	4.1Medium	en
Kemija	0.00	26	5447	5145	94%	1.6Easy	en
Matrica	0.01	1210	37	25	68%	5.9Hard	en
Najkraci	0.33	1006	49	35	71%	6.8Hard	en
Pet	0.00	39	17256	16485	96%	1.3Easy	en