By popular demand, we will be publishing the problems from Wielka Przesmycka 2011! Starting from this Saturday (08.02.14), every three days a new problem will appear here. The problems will be ordered according to the number of successful submissions in the original competition.
Please notice that the format of the contest was somewhat different than the usual: every task was in two versions, basic and professional. Both versions have the same statement, and differ (usually) in the limits on the input size. The difference is always explained in the statement, so please make sure that you read it carefully.