摘要：
Mathematically Hard Mathematically some problems look hard. But with the help of the computer, some problems can be easily solvable. In this problem, 阅读全文
摘要：
Bi-shoe and Phi-shoe Bamboo Pole-vault is a massively popular sport in Xzhiland. And Master Phi-shoe is a very popular coach for his success. He needs 阅读全文