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<b><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">6.2 <font color="#FF0000" size="5"> Elementary graph operations</font>

⑴<font color="#FF0000">depth first search</font>
     
#define FALSE 0
#define TRUE 1
short int visited [MAX_VERTICES];</font></b></pre>
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      <pre><b><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">void <font color="#FF0000">dfs</font>(int v)
{<i><font size="3" color="#CC0099">/* depth first search of a graph beginning with 
   vertex v */</font></i>
        node_pointer w;
        visited[v] = TRUE;
        printf ("%5d",v);
        for (w = graph[v]; w; w = w->link)
             if ( !visited [ w->vertex ])
               <font color="#FF0000"> dfs</font>( w->vertex );
}</font></b></pre>
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      <pre><img src="image/DEPTH.gif" width="161" height="288"></pre>
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