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	2189	1142	52%	4.8Medium	en
Cross	0.00	1041	373	292	78%	4.1Medium	en
Kemija	0.00	26	5443	5142	94%	1.6Easy	en
Matrica	0.01	1210	36	24	67%	6.1Hard	en
Najkraci	0.33	1006	48	34	71%	7.0Hard	en
Pet	0.00	39	17194	16423	96%	1.3Easy	en