Problems from Central Europe Regional Contest (CERC) 2013

Name
Fastest
Shortest
Total
Acc.
Ratio
Difficulty
Languages
Bus0.0056327345355%1.8Easyen
Captain Obvious and the Rabbit-Man0.41251953537%6.6Harden
Chain & Co.0.221544781823%7.0Harden
Crane0.0258525811946%5.5Harden
Digraphs0.0010673407422%6.4Harden
Draughts0.0156466826339%3.4Mediumen
Escape0.3310014377116%9.1Harden
Magical GCD0.2612895428330%5.4Mediumen
Rubik's Rectangle0.211858862124%8.3Harden
Subway0.4218001191916%8.1Harden
What does the fox say?0.007011244498944%2.1Easyen