1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/work/marci/bfsit_vs_byhand.cc	Wed Apr 21 14:50:42 2004 +0000
     1.3 @@ -0,0 +1,67 @@
     1.4 +// -*- c++ -*-
     1.5 +#include <iostream>
     1.6 +#include <fstream>
     1.7 +
     1.8 +#include <list_graph.h>
     1.9 +#include <smart_graph.h>
    1.10 +#include <dimacs.h>
    1.11 +#include <time_measure.h>
    1.12 +#include <for_each_macros.h>
    1.13 +#include <bfs_iterator.h>
    1.14 +
    1.15 +using namespace hugo;
    1.16 +
    1.17 +int main() {
    1.18 +  typedef ListGraph Graph; 
    1.19 +  typedef Graph::Node Node;
    1.20 +  typedef Graph::NodeIt NodeIt;
    1.21 +  typedef Graph::Edge Edge;
    1.22 +  typedef Graph::EdgeIt EdgeIt;
    1.23 +  typedef Graph::OutEdgeIt OutEdgeIt;
    1.24 +
    1.25 +  Graph G;
    1.26 +  Node s, t;
    1.27 +  Graph::EdgeMap<int> cap(G);
    1.28 +  readDimacsMaxFlow(std::cin, G, s, t, cap);
    1.29 +  Graph::NodeMap<OutEdgeIt> pred(G);
    1.30 +  Timer ts;
    1.31 +  {
    1.32 +    ts.reset();
    1.33 +    Graph::NodeMap<bool> reached(G);
    1.34 +    /*Reverse_bfs from t, to find the starting level.*/
    1.35 +    reached.set(s, true);
    1.36 +    pred.set(s, INVALID);
    1.37 +    std::queue<Node> bfs_queue;
    1.38 +    bfs_queue.push(t);
    1.39 +    while (!bfs_queue.empty()) {
    1.40 +      Node v=bfs_queue.front();	
    1.41 +      bfs_queue.pop();
    1.42 +      OutEdgeIt e;
    1.43 +      for(G.first(e,v); G.valid(e); G.next(e)) {
    1.44 +	Node w=G.head(e);
    1.45 +	if (!reached[w]) {
    1.46 +	  bfs_queue.push(w);
    1.47 +	  reached.set(w, true);
    1.48 +	  pred.set(w, e);
    1.49 +	}
    1.50 +      }
    1.51 +    }
    1.52 +
    1.53 +    std::cout << ts << std::endl;
    1.54 +  }
    1.55 +
    1.56 +  {
    1.57 +    ts.reset();      
    1.58 +    BfsIterator5< Graph, Graph::NodeMap<bool> > bfs(G);
    1.59 +    bfs.pushAndSetReached(s);
    1.60 +    pred.set(s, INVALID);
    1.61 +    while (!bfs.finished()) { 
    1.62 +      ++bfs; 
    1.63 +      if (G.valid(bfs) && bfs.isBNodeNewlyReached()) 
    1.64 +	pred.set(bfs.bNode(), bfs);
    1.65 +    }
    1.66 +    std::cout << ts << std::endl;
    1.67 +  }
    1.68 +
    1.69 +  return 0;
    1.70 +}