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来自「浙江大学计算机学院数据结构课程的教学课件」· HTM 代码 · 共 40 行

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<b><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">The <font color="#FF0000">restrictions on graph</font>:
<i>1. A graph may not have an edge from a vertex , i, back to 
     itself  (self loops)
2. A graph may not have multiple occurrences of the same 
     edge ( multigraph )
                                               <img src="image/text6-c.gif" width="291" height="121">       </i>
<font color="#FF0000"><i>complete graph</i></font><i><font face="Arial, Helvetica, sans-serif" size="4"> </font></i> ----- 
                  a graph that has the maximum number of edges
<font color="#FF0000"><i>undirected graph</i></font> (n vertices)    -----     n (n-1) / 2
<font color="#FF0000"><i>directed graph</i></font> (n vertices)         -----     n (n-1) 
 
<i><font color="#0033CC">(v0, v1)</font></i>     --->  vertices v0 and v1 are adjacent 
                  --->  edge (v0, v1) is incident on v0 and v1
<i><font color="#0033CC">&lt;v0, v1&gt;</font></i>   --->  vertex  v0  is  adjacent to  vertex  v1
                          vertex  v1  is  adjacent from  vertex  v0 
                  --->  edge &lt;v0, v1&gt; is incident on  v0 and  v1

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