一边学习，一边记录，一边进步，一边。。。

You are given an undirected graph consisting of n vertices and m edges. Your task is to find the number of connected components which are cycles. Here are some definitions of graph theory. An undir...

Today is Ignatius' birthday. He invites a lot of friends. Now it's dinner time. Ignatius wants to know how many tables he needs at least. You have to notice that not all the friends know each other, a...