摘要：
Description Vasya has the square chessboard of size n × n and m rooks. Initially the chessboard is empty. Vasya will consequently put the rooks on the 阅读全文
摘要：
Description There are n cards (n is even) in the deck. Each card has a positive integer written on it. n / 2 people will play new card game. At the be 阅读全文