string is composed ofn(20) characters in an orderly sequence recorded as s:“c1C2C3…Cn” S is string name c123n is value is a character n is string length Such as,S=“ TSinghua University
chapter 9 GRAPH ALGORITHMs $I Definitions e G(V,E) where G: =graph, V=V(G): :=finite nonempty set of vertices, andE=E(G): : = finite set of edges. d' Undirected graph:(V;,vi)=(j,vi): =the same edge 6 Directed graph(digraph): :=2* I tailhead