摘要：
这是 DFS 系列的第一篇 。 首先给出一个重要的定理。该定理来自《算法导论》。 An undirected graph may entail some ambiguity in how we classify edges, since $(u,v)$ and $(v,u)$ are really 阅读全文
「以解决问题为乐」
真的喜欢么？真的喜欢就去做吧。
Lost Boy Calling 。。。。
... Many of these issues are best dealt with at the algorithmic level, rather than by "tweaking" the code.
This is an obscurity that catches the unwary.
原来我什么都不懂。