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D. Regular Bridge time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output An undirected graph is called k-regular, if the degrees of all its verti

Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practice. There is one of them:Yuta has n positive A1−An and their su

On February, 30th n students came in the Center for Training Olympiad Programmers (CTOP) of the Berland State University. They came one by one, one after another. Each of them went in, and before sitti

Little X used to play a card game called “24 Game”, but recently he has found it too easy. So he invented a new game.Initially you have a sequence of n integers: 1, 2, …, n. In a single step, you can p