[C] deleting node from graph Post: 302531699

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Top Forums Programming [C] deleting node from graph Post 302531699 by Luke Bonham on Friday 17th of June 2011 01:52:23 PM

06-17-2011

Registered User

[C] deleting node from graph

Using adjacency lists, I implemented this operation as follows:

Code:

/* remove the first node it finds with value 'val' in L list */
edge *removeEdge (edge *L, int val)
{
      if( !L ) return NULL;

      if( L->key == val )
      {
          edge *temp = L->next;
          free (L);
          return temp;
      }

      L->next = removeEdge (L->next, val);

      return L;
}

/* deletes node with key u from G */
int g_deleteNode (graph *G, int u)
{
    int i;     
    
    if( G != NULL && (u >= 0 && u < G->nv) )
    {   
        for( i = 0; i < G->nv; i++ )
             /* because removeEdge is a list node removing function */
             G->adj[i]->next = removeEdge (G->adj[i]->next, u);
        
        for( i = u; i < G->nv; i++ )
             if( i + 1 < G->nv ) G->adj[i] = G->adj[i+1];
        
        free(G->adj[i]);
        
        G->nv--;
               
        return 1;
    }
    
    else
    {
        if( !G ) printf("Error: null graph.\n");
        else printf("Error: edge does not belong to graph.\n");        
        return 0;
    }
}

Fact is, sometimes it crashes: could you help me understand why?

And is this a good implementation, or could I do better?

Thanks in advance.

Luke Bonham

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LEARN ABOUT NETBSD

tsort

TSORT(1)						    BSD General Commands Manual 						  TSORT(1)

NAME

     tsort -- topological sort of a directed graph

SYNOPSIS

     tsort [-l] [-q] [file]

DESCRIPTION

     tsort takes a list of pairs of node names representing directed arcs in a graph and prints the nodes in topological order on standard output.
     Input is taken from the named file, or from standard input if no file is given.

     Node names in the input are separated by white space and there must be an even number of node names.

     Presence of a node in a graph can be represented by an arc from the node to itself.  This is useful when a node is not connected to any other
     nodes.

     If the graph contains a cycle (and therefore cannot be properly sorted), one of the arcs in the cycle is ignored and the sort continues.
     Cycles are reported on standard error.

     The options are as follows:

     -l      Search for and display the longest cycle.	Can take a very long time.

     -q      Do not display informational messages about cycles.  This is primarily intended for building libraries, where optimal ordering is not
	     critical, and cycles occur often.

SEE ALSO

     ar(1)

HISTORY

     A tsort command appeared in Version 7 AT&T UNIX.  This tsort command and manual page are derived from sources contributed to Berkeley by
     Michael Rendell of Memorial University of Newfoundland.

BSD
								   April 1, 1994							       BSD

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