摘要：B. Cells Not Under Attack time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output B. Cells Not U 阅读全文

摘要：Description Polycarp has quite recently learned about email aliases. Of course, he used to suspect that the case of the letters doesn't matter in emai 阅读全文

摘要：Description Hooray! Berl II, the king of Berland is making a knight tournament. The king has already sent the message to all knights in the kingdom an 阅读全文