Original link: https://www.shuizilong.com/house/archives/block-cut-tree/
- https://oi-wiki.org/graph/block-forest/#%E4%BE%8B%E9%A2%98
- https://codeforces.com/gym/102512/problem/A
- https://www.shuizilong.com/house/archives/spoj-9577-dynamic-tree-connectivity/
- https://www.shuizilong.com/house/archives/spoj-375-query-on-a-tree/
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