Problems from Croatian Open Competition in Informatics 2011/2012, contest #5

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Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Blokovi	0.02	70	31	17	55%	6.8Hard	en
DNA	0.00	53	372	294	79%	4.4Medium	en
Eko	0.04	86	435	349	80%	3.3Medium	en
Križaljka	0.00	100	1216	1152	95%	1.7Easy	en
Popločavanje	0.06	853	65	45	69%	5.7Hard	en
Razbibriga	0.01	242	105	84	80%	6.0Hard	en