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Problem Statement Snuke has a calculator. It has a display and two buttons. Initially, the display shows an integer x. Snuke wants to change this valu 阅读全文
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Description Santa Claus has Robot which lives on the infinite grid and can move along its lines. He can also, having a sequence of m points p1, p2, .. 阅读全文
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Description Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of 阅读全文
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Description Santa Claus is the first who came to the Christmas Olympiad, and he is going to be the first to take his place at a desk! In the classroom 阅读全文