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E. Kefa and Watch time limit per test1.5 seconds memory limit per test256 megabytes inputstandard input outputstandard output One day Kefa the parrot was walking down the street as he was on the w

After improving the marketing strategy, TIANKENG has made a fortune and he is going to step into the status of TuHao. Nevertheless, TIANKENG wants his restaurant to go international, so he decides to n

Given a string S and two integers L and M, we consider a substring of S as “recoverable” if and only if (i) It is of length M*L; (ii) It can be constructed by concatenating M “diversified” subs

Problem Description The Eternal Fleet was built many centuries ago before the time of Valkorion by an unknown race on the planet of Iokath. The fate of the Fleet’s builders is unknown but their legac