A directed graph, or digraph G consists of a finite nonempty set of vertices V, and a finite set of edges E, where an edge is an ordered pair of vertices in V.是什么意思_A directed graph, or digraph G consists of a finite nonempty set of vertices V, and a finite set of edges E, where an edge is an ordered pair of vertices in V.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句