摘要：
https://blog.csdn.net/jeryjeryjery/article/details/52829142?locationNum=4&fps=1 以防链接失效，特此转载此博，如有侵权请见谅 在有向图G中，如果两个顶点间至少存在一条路径，称两个顶点强连通(strongly connect 阅读全文
摘要：
A tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed edges between 阅读全文