Articulation point - MarisaOJ: Marisa Online Judge

Articulation point

Time limit: 1000 ms
Memory limit: 256 MB
Given a simple, undirected graph with $n$ vertices and $m$ edges,. Find all articulation points. ### Input - The first line contains 2 integers $n,m$. - The next $m$ lines, each line contains two integers $u, v$, there is an edge between $u$ and $v$. ### Output - The first line, print the number of articulation points, the second line print the articulation points in ascending order. ### Constraints - $1 \le n,m \le 10^5$. - $1 \le u,v \le n$. ### Example Input: ``` 6 5 1 3 2 3 3 4 4 5 4 6 ``` Output: ``` 2 3 4 ```