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http://acm.hdu.edu.cn/showproblem.php?pid=5391 Tina Town is a friendly place. People there care about each other. Tina has a ball called zball. Zball is magic. It grows larger every day. On the first...

http://acm.hdu.edu.cn/showproblem.php?pid=2973 The math department has been having problems lately. Due to immense amount of unsolicited automated programs which were crawling across their pages, the...