摘要：
小C最近学了很多最小生成树的算法，Prim算法、Kurskal算法、消圈算法等等。正当小C洋洋得意之时，小P又来泼小C冷水了。小P说，让小C求出一个无向图的次小生成树，而且这个次小生成树还得是严格次小的，也就是说：如果最小生成树选择的边集是EM，严格次小生成树选择的边集是ES，那么需要满足：(val 阅读全文
摘要：
Discription Eighth-grader Vova is on duty today in the class. After classes, he went into the office to wash the board, and found on it the number n. 阅读全文
摘要：
Discription You have a team of N people. For a particular task, you can pick any non-empty subset of people. The cost of having x people for the task 阅读全文