摘要：
Let’s play a game.We add numbers 1,2...n in increasing order from 1 and put them into some sets. When we add i,we must create a new set, and put iinto 阅读全文
摘要：
Using regular expression to define a numeric string is a very common thing. Generally, use the shape as follows: (0|9|7) (5|6) (2) (4|5) Above regular 阅读全文
摘要：
Problem Description Nowadays, at least one wrestling match is held every year in our country. There are a lot of people in the game is "good player”, 阅读全文