摘要：
转载自https://www.cnblogs.com/hanmk/p/8724162.html 学习爬虫，怎么也绕不开requests库和BeautifulSoup库，先说下BeautifulSoup库： BeautifulSoup库通俗来说是【解析、遍历、维护“标签树”(例如html、xml等格式 阅读全文
摘要：
Description You are given a rooted tree with n vertices. The vertices are numbered from 1 to n, the root is the vertex number 1. Each vertex has a col 阅读全文