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C/C++ Source or Header  |  1994-11-16  |  1.1 KB  |  46 lines
  1. /*******************************************************************************
  2. +
  3. +  LEDA  3.1c
  4. +
  5. +
  6. +  _bfs.c
  7. +
  8. +
  9. +  Copyright (c) 1994  by  Max-Planck-Institut fuer Informatik
  10. +  Im Stadtwald, 6600 Saarbruecken, FRG     
  11. +  All rights reserved.
  12. + 
  13. *******************************************************************************/
  14.  
  15.  
  16.  
  17. /*******************************************************************************
  18. *                                                                              *
  19. *  BFS  (breadth first search)                                                 *
  20. *                                                                              *
  21. *******************************************************************************/
  22.  
  23.  
  24. #include <LEDA/graph_alg.h>
  25.  
  26. list<node> BFS(const graph&, node s, node_array<int>& dist)
  27. { 
  28.   list<node> Q(s);
  29.   node v,w;
  30.   list_item it;
  31.  
  32.   dist[s] = 0;
  33.   it = Q.first();
  34.  
  35.   while (it != nil)
  36.     { v = Q[it];
  37.       forall_adj_nodes(w,v)
  38.          if (dist[w] < 0) { Q.append(w); 
  39.                             dist[w] = dist[v]+1;
  40.                            }
  41.       it = Q.succ(it);
  42.      }
  43.   return Q;
  44. }
  45.  
  46.