摘要：
I. Older Brother Your older brother is an amateur mathematician with lots of experience. However, his memory is very bad. He recently got interested i 阅读全文
摘要：
L. Sticky Situation While on summer camp, you are playing a game of hide-and-seek in the forest. You need to designate a “safe zone”, where, if the pl 阅读全文
摘要：
B-Coin Bob has a not even coin, every time he tosses the coin, the probability that the coin's front face up is \frac{q}{p}(\frac{q}{p} \le \frac{1}{2 阅读全文