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Algorithms for finding an element in some specified data-structure (most commonly, in a tree).

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How do I find the roots of the disconnected subgraphs of a directed graph?

If I have a directed acyclic graph $G(V,E)$, which may consist of several disconnected subgraphs $G_i(V_i,E_i) \subset G(V,E)$, how do I find the root of every subgraph $G_i(V_i,E_i)$?
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