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What is a "proper ancestor" in a tree?
source link: https://codeforces.com/blog/entry/117010
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I'm currently reading this blog in order to learn Dominator Tree:
https://tanujkhattar.wordpress.com/2016/01/11/dominator-tree-of-a-directed-graph/
And I don't understand what it means by "proper ancestor". Could somebody please explain this to me?
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