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	2259	1207	53%	4.5Medium	en
Cross	0.00	1041	378	296	78%	4.1Medium	en
Kemija	0.00	26	5450	5148	94%	1.6Easy	en
Matrica	0.01	1210	37	25	68%	5.9Hard	en
Najkraci	0.33	1006	48	34	71%	7.2Hard	en
Pet	0.00	39	17282	16511	96%	1.3Easy	en