source: lemon-0.x/src/work/iterator_bfs_dfs_demo.cc @ 1046:1bb1d4c87331

#include <iostream>
#include <vector>
#include <string>

#include <list_graph.hh>
#include <bfs_iterator.hh>

using namespace lemon;

int main (int, char*[])
{
  typedef ListGraph::NodeIt NodeIt;
  typedef ListGraph::EdgeIt EdgeIt;
  typedef ListGraph::EachNodeIt EachNodeIt;
  typedef ListGraph::EachEdgeIt EachEdgeIt;
  typedef ListGraph::OutEdgeIt OutEdgeIt;
  typedef ListGraph::InEdgeIt InEdgeIt;
  typedef ListGraph::SymEdgeIt SymEdgeIt;
 
  ListGraph G;

  NodeIt s=G.addNode();
  NodeIt v1=G.addNode();
  NodeIt v2=G.addNode();
  NodeIt v3=G.addNode();
  NodeIt v4=G.addNode();
  NodeIt t=G.addNode();
  
  G.addEdge(s, v1);
  G.addEdge(s, v2);
  G.addEdge(v1, v2);
  G.addEdge(v2, v1);
  G.addEdge(v1, v3);
  G.addEdge(v3, v2);
  G.addEdge(v2, v4);
  G.addEdge(v4, v3);
  G.addEdge(v3, t);
  G.addEdge(v4, t);

  std::cout << "bfs and dfs demo on the directed graph" << std::endl;
  for(EachNodeIt i=G.first<EachNodeIt>(); i.valid(); ++i) { 
    std::cout << i << ": ";
    std::cout << "out edges: ";
    for(OutEdgeIt j=G.first<OutEdgeIt>(i); j.valid(); ++j) 
      std::cout << j << " ";
    std::cout << "in edges: ";
    for(InEdgeIt j=G.first<InEdgeIt>(i); j.valid(); ++j) 
      std::cout << j << " ";
    std::cout << std::endl;
  }

  //std::cout << std::endl;
  //EachNodeIt u1=G.first<EachNodeIt>();
  //EachEdgeIt u=G.first<EachEdgeIt>();
  //OutEdgeIt u=G.first<OutEdgeIt>(s);
  //InEdgeIt u=G.first<InEdgeIt>(s);
  //SymEdgeIt u=G.first<SymEdgeIt>(s);
  //OutEdgeIt u=G.first<OutEdgeIt>(s);
  //EachNodeIt u=G.first<EachNodeIt>();
  //EachEdgeIt u=G.first<EachEdgeIt>();
  //OutEdgeIt u=G.first<OutEdgeIt>(s);
  //InEdgeIt u=G.first<InEdgeIt>(s);
  //SymEdgeIt u=G.first<SymEdgeIt>(s);
  //u=G.first(s);
  //u=G.first_ize(s, OutEdgeIt());
  //std::cout << "ize " << u << std::endl;

  /*
  {
    std::cout << "iterator bfs demo..." << std::endl;
    NodePropertyVector<ListGraph, bool> reached(G, false);
    reached.set(s, true);
    std::queue<ListGraph::OutEdgeIt> bfs_queue;
    bfs_queue.push(G.firstOutEdge(G.firstNode()));
    BfsIterator< ListGraph, ListGraph::OutEdgeIt, NodePropertyVector<ListGraph, bool> > bfs(G, bfs_queue, reached);
    for ( ; !bfs.finished(); ++bfs) {
      if (OutEdgeIt(bfs).valid()) {
        std::cout << "OutEdgeIt: " << bfs; 
        std::cout << " aNode: " << G.aNode(bfs); 
        std::cout << " bNode: " << G.bNode(bfs) << " ";
      } else { 
        std::cout << "OutEdgeIt: " << "invalid"; 
        std::cout << " aNode: " << G.aNode(bfs); 
        std::cout << " bNode: " << "invalid" << " ";
      }
      if (bfs.bNodeIsNewlyReached()) { 
        std::cout << "bNodeIsNewlyReached ";
      } else { 
        std::cout << "bNodeIsNotNewlyReached ";
      } 
      if (bfs.aNodeIsExamined()) { 
        std::cout << "aNodeIsExamined ";
      } else { 
        std::cout << "aNodeIsNotExamined ";
      } 
      std::cout<<std::endl;
    }
  }

  {
    std::cout << "iterator dfs demo..." << std::endl;
    NodePropertyVector<ListGraph, bool> reached(G, false);
    reached.set(s, true);
    std::stack<ListGraph::OutEdgeIt> dfs_stack;
    dfs_stack.push(G.firstOutEdge(G.firstNode()));
    DfsIterator< ListGraph, ListGraph::OutEdgeIt, NodePropertyVector<ListGraph, bool> > dfs(G, dfs_stack, reached);
    for(; !dfs.finished(); ++dfs) {
      if (OutEdgeIt(dfs).valid()) {
        std::cout << "OutEdgeIt: " << dfs; 
        std::cout << " aNode: " << G.aNode(dfs); 
        std::cout << " bNode: " << G.bNode(dfs) << " ";
      } else { 
        std::cout << "OutEdgeIt: " << "invalid"; 
        std::cout << " aNode: " << G.aNode(dfs); 
        std::cout << " bNode: " << "invalid" << " ";
      }
      if (dfs.bNodeIsNewlyReached()) { 
        std::cout << "bNodeIsNewlyReached ";
      } else { 
        std::cout << "bNodeIsNotNewlyReached ";
      } 
      if (dfs.aNodeIsLeaved()) { 
        std::cout << "aNodeIsLeaved ";
      } else { 
        std::cout << "aNodeIsNotLeaved ";
      } 
      std::cout<<std::endl;
    }
    if (OutEdgeIt(dfs).valid()) {
      std::cout << "OutEdgeIt: " << dfs; 
      std::cout << " aNode: " << G.aNode(dfs); 
      std::cout << " bNode: " << G.bNode(dfs) << " ";
    } else { 
      std::cout << "OutEdgeIt: " << "invalid"; 
      std::cout << " aNode: " << G.aNode(dfs); 
      std::cout << " bNode: " << "invalid" << " ";
    }
    if (dfs.bNodeIsNewlyReached()) { 
      std::cout << "bNodeIsNewlyReached ";
    } else { 
      std::cout << "bNodeIsNotNewlyReached ";
    } 
    if (dfs.aNodeIsLeaved()) { 
      std::cout << "aNodeIsLeaved ";
    } else { 
      std::cout << "aNodeIsNotLeaved ";
    } 
    std::cout<<std::endl;
  }
  */

  {
    std::cout << "iterator bfs demo 1 ..." << std::endl;
    ListGraph::NodeMap<bool> reached(G, false);
    reached.set(s, true);
    std::queue<ListGraph::OutEdgeIt> bfs_queue;
    bfs_queue.push(G.first<OutEdgeIt>(s));
    BfsIterator1< ListGraph, ListGraph::OutEdgeIt, ListGraph::NodeMap<bool> > bfs(G, bfs_queue, reached);
    while (!bfs.finished()) {
      if (OutEdgeIt(bfs).valid()) {
        std::cout << "OutEdgeIt: " << bfs; 
        std::cout << " aNode: " << G.aNode(bfs); 
        std::cout << " bNode: " << G.bNode(bfs) << " ";
      } else { 
        std::cout << "OutEdgeIt: " << "invalid"; 
        std::cout << " aNode: " << G.aNode(bfs); 
        std::cout << " bNode: " << "invalid" << " ";
      }
      if (bfs.bNodeIsNewlyReached()) { 
        std::cout << "bNodeIsNewlyReached ";
      } else { 
        std::cout << "bNodeIsNotNewlyReached ";
      } 
      if (bfs.aNodeIsExamined()) { 
        std::cout << "aNodeIsExamined ";
      } else { 
        std::cout << "aNodeIsNotExamined ";
      } 
      std::cout<<std::endl;
      bfs.next();
    }
  }
  
  {
    std::cout << "iterator bfs demo 2 ..." << std::endl;
    //ListGraph::NodeMap<bool> reached(G, false);
    //reached.set(s, true);
    //std::queue<ListGraph::OutEdgeIt> bfs_queue;
    //bfs_queue.push(G.first<OutEdgeIt>(s));
    BfsIterator2< ListGraph, ListGraph::OutEdgeIt, ListGraph::NodeMap<bool> > bfs(G);
    bfs.pushAndSetReached(s);
    while (!bfs.finished()) {
      if (OutEdgeIt(bfs).valid()) {
        std::cout << "OutEdgeIt: " << bfs; 
        std::cout << " aNode: " << G.aNode(bfs); 
        std::cout << " bNode: " << G.bNode(bfs) << " ";
      } else { 
        std::cout << "OutEdgeIt: " << "invalid"; 
        std::cout << " aNode: " << G.aNode(bfs); 
        std::cout << " bNode: " << "invalid" << " ";
      }
      if (bfs.isBNodeNewlyReached()) { 
        std::cout << "bNodeIsNewlyReached ";
      } else { 
        std::cout << "bNodeIsNotNewlyReached ";
      } 
      if (bfs.isANodeExamined()) { 
        std::cout << "aNodeIsExamined ";
      } else { 
        std::cout << "aNodeIsNotExamined ";
      } 
      std::cout<<std::endl;
      ++bfs;
    }
  }
  



  {
    std::cout << "iterator dfs demo 1..." << std::endl;
    ListGraph::NodeMap<bool> reached(G, false);
    reached.set(s, true);
    std::stack<ListGraph::OutEdgeIt> dfs_stack;
    dfs_stack.push(G.first<OutEdgeIt>(s));
    DfsIterator1< ListGraph, ListGraph::OutEdgeIt, ListGraph::NodeMap<bool> > dfs(G, dfs_stack, reached);
    do {
      dfs.next();
      if (OutEdgeIt(dfs).valid()) {
        std::cout << "OutEdgeIt: " << dfs; 
        std::cout << " aNode: " << G.aNode(dfs); 
        std::cout << " bNode: " << G.bNode(dfs) << " ";
      } else { 
        std::cout << "OutEdgeIt: " << "invalid"; 
        std::cout << " aNode: " << G.aNode(dfs); 
        std::cout << " bNode: " << "invalid" << " ";
      }
      if (dfs.bNodeIsNewlyReached()) { 
        std::cout << "bNodeIsNewlyReached ";
      } else { 
        std::cout << "bNodeIsNotNewlyReached ";
      } 
      if (dfs.aNodeIsLeaved()) { 
        std::cout << "aNodeIsLeaved ";
      } else { 
        std::cout << "aNodeIsNotLeaved ";
      } 
      std::cout<<std::endl;
    } while (!dfs.finished());
  }


  {
    std::cout << "iterator bfs demo from node 5 with replacing \n OutEdgeIt by InEdgeIt ..." << std::endl;
    ListGraph::NodeMap<bool> reached(G, false);
    reached.set(t, true);
    std::queue<ListGraph::InEdgeIt> bfs_queue;
    bfs_queue.push(G.first<InEdgeIt>(t));
    BfsIterator1< ListGraph, ListGraph::InEdgeIt, ListGraph::NodeMap<bool> > bfs(G, bfs_queue, reached);
    while (!bfs.finished()) {
      if (InEdgeIt(bfs).valid()) {
        std::cout << "InEdgeIt: " << bfs; 
        std::cout << " aNode: " << G.aNode(bfs); 
        std::cout << " bNode: " << G.bNode(bfs) << " ";
      } else { 
        std::cout << "InEdgeIt: " << "invalid"; 
        std::cout << " aNode: " << G.aNode(bfs); 
        std::cout << " bNode: " << "invalid" << " ";
      }
      if (bfs.bNodeIsNewlyReached()) { 
        std::cout << "bNodeIsNewlyReached ";
      } else { 
        std::cout << "bNodeIsNotNewlyReached ";
      } 
      if (bfs.aNodeIsExamined()) { 
        std::cout << "aNodeIsExamined ";
      } else { 
        std::cout << "aNodeIsNotExamined ";
      } 
      std::cout<<std::endl;
      bfs.next();
    }
  }
  

  {
    std::cout << "the graph is considered as an undirected graph \n by replacing InEdgeIt by SymEdgeIt ..." << std::endl;
    ListGraph::NodeMap<bool> reached(G, false);
    reached.set(t, true);
    std::queue<ListGraph::SymEdgeIt> bfs_queue;
    bfs_queue.push(G.first<SymEdgeIt>(t));
    BfsIterator1< ListGraph, ListGraph::SymEdgeIt, ListGraph::NodeMap<bool> > bfs(G, bfs_queue, reached);
    while (!bfs.finished()) {
      if (SymEdgeIt(bfs).valid()) {
        std::cout << "SymEdgeIt: " << bfs; 
        std::cout << " aNode: " << G.aNode(bfs); 
        std::cout << " bNode: " << G.bNode(bfs) << " ";
      } else { 
        std::cout << "SymEdgeIt: " << "invalid"; 
        std::cout << " aNode: " << G.aNode(bfs); 
        std::cout << " bNode: " << "invalid" << " ";
      }
      if (bfs.bNodeIsNewlyReached()) { 
        std::cout << "bNodeIsNewlyReached ";
      } else { 
        std::cout << "bNodeIsNotNewlyReached ";
      } 
      if (bfs.aNodeIsExamined()) { 
        std::cout << "aNodeIsExamined ";
      } else { 
        std::cout << "aNodeIsNotExamined ";
      } 
      std::cout<<std::endl;
      bfs.next();
    }
  }

  return 0;
}