Lecture 9: Breadth-First Search - MIT OpenCourseWare
https://ocw.mit.edu/courses/6-006-introduction-to-algorithms-spring-2020/196a95604877d326c6586e60477b59d4_MIT6_006S20_lec9.pdf
WEB6.006 Introduction to Algorithms, Lecture 9: Breadth-First Search. Neighbor Sets/Adjacencies. The outgoing neighbor set of u ∈ V is Adj+(u) = {v ∈ V | (u, v) ∈ E} The incoming neighbor set of u ∈ V is Adj−(u) = {v ∈ V | (v, u) ∈ E} The out-degree of a vertex u ∈ V is deg+(u) = |Adj+(u)|. The in-degree of a vertex u ∈ V is deg−(u) = |Adj−(u)|.
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