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	33	19	58%	6.9Hard	en
DNA	0.00	53	377	300	80%	4.2Medium	en
Eko	0.04	86	470	383	81%	3.1Medium	en
Križaljka	0.00	100	1225	1161	95%	1.7Easy	en
Popločavanje	0.06	853	69	49	71%	5.7Hard	en
Razbibriga	0.01	242	107	87	81%	5.6Hard	en