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foucault |
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#include "HypergraphLib_platform.h"
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#include "HypergraphLib_FindCycles.h"
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#include "HypergraphLib_Node.h"
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#include "HypergraphLib_Arc.h"
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#include "HypergraphLib_Graph.h"
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#include <algorithm>
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#include <iostream>
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#undef DEBUG
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namespace HypergraphLib {
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int find_n( std::vector < Node * > & __depthFirstSearchNodes, Node *__n)
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{
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for (unsigned i=0; i<__depthFirstSearchNodes.size(); i++)
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if (__depthFirstSearchNodes[i] == __n)
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return i;
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return -1;
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}
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int find_n( std::vector < Arc * > & __depthFirstSearchArcs, Arc *__a)
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{
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for (unsigned i=0; i<__depthFirstSearchArcs.size(); i++)
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if (__depthFirstSearchArcs[i] == __a)
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return i;
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return -1;
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}
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/**
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* returns :
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* -2 if the cycle does not exist
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* -1 if the cycle exist
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* j if the cycle at index j is longer than the new one
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*/
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int does_cycle_already_exist( const std::vector < std::vector < Node * > > & cycles, const std::vector < Node * > & cycle)
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{
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for (unsigned i = 0; i < cycles.size(); i++)
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{
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for (unsigned j=0; j<cycles[i].size(); j++)
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{
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std::vector < Node * >::const_iterator it = std::find(cycle.begin(), cycle.end(), cycles[i][j]);
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if (it == cycle.end())
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goto not_equal_cycles;
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}
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if (cycles[i].size() == cycle.size())
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{
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#ifdef DEBUG
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std::cout << "Cycle \"";
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for (int j=0; j<cycle.size(); j++)
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std::cout << cycle[j]->Id() << ", ";
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std::cout << "\" matches cycle ";
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for (int j=0; j<cycles[i].size(); j++)
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std::cout << cycles[i][j]->Id() << ", ";
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std::cout << std::endl;
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#endif
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}
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else if (cycles[i].size() > cycle.size())
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{
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#ifdef DEBUG
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std::cout << "the candidate cycle \"";
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for (int j=0; j<cycle.size(); j++)
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std::cout << cycle[j]->Id() << ", ";
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std::cout << "\" is shorter than the cycle \"";
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for (int j=0; j<cycles[i].size(); j++)
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std::cout << cycles[i][j]->Id() << ", ";
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std::cout << "\"";
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std::cout << std::endl;
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#endif
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return i;
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}
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else
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{
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#ifdef DEBUG
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std::cout << "the candidate cycle \"";
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for (int j=0; j<cycle.size(); j++)
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std::cout << cycle[j]->Id() << ", ";
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std::cout << "\" is longer than the cycle \"";
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for (int j=0; j<cycles[i].size(); j++)
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std::cout << cycles[i][j]->Id() << ", ";
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std::cout << "\"";
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std::cout << std::endl;
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#endif
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}
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return -1;
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not_equal_cycles:
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continue;
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}
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#ifdef DEBUG
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std::cout << "Cycle \"";
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for (int j=0; j<cycle.size(); j++)
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std::cout << cycle[j]->Id() << ", ";
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std::cout << "\" is a new cycle "<< std::endl;
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#endif
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return -2;
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}
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void
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dfsCycle(Node *__n, std::vector < Node * > & __depthFirstSearchNodes, std::vector< Arc * > & __depthFirstSearchArcs, std::vector < std::vector < Node * > > & cycles )
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{
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std::set < Node * > adj;
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__n->AdjacentNodes( adj );
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std::vector<Node*>::iterator it3;
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//int pos_n;
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if (__depthFirstSearchNodes.size() == 0)
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__depthFirstSearchNodes.push_back(__n);
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for ( Node::MultimapArcsById::iterator itIncidentArcs = __n->IncidentArcs().begin();
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itIncidentArcs != __n->IncidentArcs().end();
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itIncidentArcs++ )
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{
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Arc * incidentArc = itIncidentArcs->second;
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for ( Arc::MultimapNodesById::iterator itAdjNodes = incidentArc->Nodes().begin();
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itAdjNodes != incidentArc->Nodes().end();
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itAdjNodes++)
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{
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Node * adjNode = itAdjNodes->second;
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std::vector < Node * > tempPath = __depthFirstSearchNodes;
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std::vector < Arc * > tempPathArcs = __depthFirstSearchArcs;
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if (__n->Owner()->IsCycle(tempPath))
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{
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//std::vector < Node * > cycle;
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//for (int i=0; i<tempPath.size(); i++)
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// cycle.push_back(tempPath[i]);
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int is_cycle_exists = does_cycle_already_exist(cycles, tempPath);
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// if the cycle does not exists
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if (is_cycle_exists == -2)
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cycles.push_back(tempPath);
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// if a shorter cycle exists : replace the long cycle with the short cycle
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if (is_cycle_exists > 0)
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{
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cycles [is_cycle_exists] = tempPath;
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}
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//tempPath = __depthFirstSearchNodes;
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}
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else if ( find_n(__depthFirstSearchNodes, adjNode) == -1 && find_n(__depthFirstSearchArcs, incidentArc) == -1)
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{
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tempPath.push_back(adjNode);
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tempPathArcs.push_back(incidentArc);
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dfsCycle (adjNode, tempPath, tempPathArcs, cycles);
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}
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}
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}
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}
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void
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FindCycles(Graph * __G, std::vector < std::vector < Node * > > & cycles)
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{
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std::vector < Node * > depthFirstSearchNodes;
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std::vector < Arc * > depthFirstSearchArcs;
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GRAPH_FOR_EACH_NODE_CONST(__G, startNode)
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{
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depthFirstSearchNodes.clear();
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dfsCycle (startNode->second, depthFirstSearchNodes, depthFirstSearchArcs, cycles);
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}
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}
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}
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