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foucault |
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#include "HypergraphLib_platform.h"
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#include "HypergraphLib_Components.h"
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#include "HypergraphLib_dfs.h"
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#include "HypergraphLib_Graph.h"
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#include "HypergraphLib_Node.h"
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/**
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* Find the strongly connected components of a graph
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// http://en.wikipedia.org/wiki/Strongly_connected_component
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STRONGLY-CONNECTED COMPONENTS (G)
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1 call DFS(G) to compute finishing times f[u] for each vertex u
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2 compute GT
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3 call DFS(GT), but in the main loop of DFS, consider the vertices in order of decreasing f[u]
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4 produce as output the vertices of each tree in the DFS forest formed in point 3 as a separate SCC.
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*/
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namespace HypergraphLib {
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void FindSCC(Graph * __G, std::set < std::set < Node * > > & __components)
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{
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std::map < int, Node * > unvisitedNodes = __G->GetNodes();
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while (unvisitedNodes.size())
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{
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std::set < Node * > depthFirstSearchNodes;
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dfs((unvisitedNodes.begin())->second, depthFirstSearchNodes);
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__components.insert ( depthFirstSearchNodes );
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for ( std::set < Node * >::const_iterator it = depthFirstSearchNodes.begin();
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it != depthFirstSearchNodes.end();
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it++)
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unvisitedNodes.erase((*it)->Id());
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}
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}
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}
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