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1. Definitions and basic terms of drawings ①. Definition of graph Graph G is composed of two sets V and E, marked as G=(V,E), where V is the finite nonempty set of vertices, e is the finite set of vertex pairs in V, and these vertex pairs are symmetrical as edges. V(G) and E(G) usually represent the vertex set and edge set of graph G re ...

A busy city A busy city Core ideas As you can see from the title, n n n intersections are actually n n n vertices, the road is bidirectional, indicating that it is an undirected ...