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	32	18	56%	6.7Hard	en
DNA	0.00	53	374	296	79%	4.3Medium	en
Eko	0.04	86	438	351	80%	3.3Medium	en
Križaljka	0.00	100	1219	1155	95%	1.7Easy	en
Popločavanje	0.06	853	66	46	70%	5.6Hard	en
Razbibriga	0.01	242	106	85	80%	6.0Hard	en