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breadth first search

Posted on 1997-04-30
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Last Modified: 2010-04-15
is there code for a breadth first search of a graph? (not depth first search).
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Question by:biggup
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jos010697 earned 140 total points
ID: 1250197
You need an additional queue to store the fan out of the
current nodes. Here's some pseudo code:

Note: push operates on the front of the queue (as
if it were a stack), while pop pops an element
from the rear of the queue.

queue= empty;
push(queue, node);
bfs(stack);

void bfs(stack_t stack) {
node_t node;

if (!(node= pop(stack)) /* anything left to do? */
   return;

if (!marked(node)) { /* if not been here before */
   mark(node);      /* mark it and do something useful here */
   for (<all edges leaving this node>)
      push(stack, node->fanout);
   bfs(stack); /* tail recursion here (it could be an iteration */
}

kind regards,

Jos
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