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	2021	1022	51%	5.3Medium	en
Cross	0.00	1041	370	290	78%	4.1Medium	en
Kemija	0.00	26	5409	5111	94%	1.6Easy	en
Matrica	0.01	1210	33	21	64%	6.2Hard	en
Najkraci	0.34	1006	47	34	72%	6.3Hard	en
Pet	0.00	39	16788	16029	95%	1.3Easy	en