C++ PNGraph::DelNode方法代码示例

int getNumOfIndependentPaths(const PNGraph& graph, int srcNodeID, int dstNodeID) {
	int ret = 0;
	while (true) {
		PNGraph bfsGraph = TSnap::GetBfsTree(graph, srcNodeID, true, false);
		if (!bfsGraph->IsNode(dstNodeID)) {
			return ret;
		}
		printf("%d hops\n", TSnap::GetShortPath(bfsGraph, srcNodeID, dstNodeID, true));

		// Go back from dstNode to src
		int itrNodeId = dstNodeID;
		while (itrNodeId != srcNodeID) {
			TNGraph::TNodeI curNode = bfsGraph->GetNI(itrNodeId);
			int parentNodeId = curNode.GetInNId(0);

			// Delete Edges
			// graph->DelEdge(parentNodeId, itrNodeId, true);
			// Delete Node
			if (itrNodeId != dstNodeID && itrNodeId != srcNodeID) {
				graph->DelNode(itrNodeId);
			}

			itrNodeId = parentNodeId;
		}
		++ret;
	}
}

// Test node, edge creation
void ManipulateNodesEdges() {
  int NNodes = 10000;
  int NEdges = 100000;
  const char *FName = "demo.graph.dat";

  PNGraph Graph;
  PNGraph Graph1;
  PNGraph Graph2;
  int i;
  int n;
  int NCount;
  int ECount1;
  int ECount2;
  int x,y;
  bool t;

  Graph = TNGraph::New();
  t = Graph->Empty();

  // create the nodes
  for (i = 0; i < NNodes; i++) {
    Graph->AddNode(i);
  }
  t = Graph->Empty();
  n = Graph->GetNodes();

  // create random edges
  NCount = NEdges;
  while (NCount > 0) {
    x = rand() % NNodes;
    y = rand() % NNodes;
    // Graph->GetEdges() is not correct for the loops (x == y),
    // skip the loops in this test
    if (x != y  &&  !Graph->IsEdge(x,y)) {
      n = Graph->AddEdge(x, y);
      NCount--;
    }
  }
  PrintGStats("ManipulateNodesEdges:Graph",Graph);

  // get all the nodes
  NCount = 0;
  for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
    NCount++;
  }

  // get all the edges for all the nodes
  ECount1 = 0;
  for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
    for (int e = 0; e < NI.GetOutDeg(); e++) {
      ECount1++;
    }
  }

  // get all the edges directly
  ECount2 = 0;
  for (TNGraph::TEdgeI EI = Graph->BegEI(); EI < Graph->EndEI(); EI++) {
    ECount2++;
  }
  printf("ManipulateNodesEdges:Graph, nodes %d, edges1 %d, edges2 %d\n",
      NCount, ECount1, ECount2);

  // assignment
  Graph1 = TNGraph::New();
  *Graph1 = *Graph;
  PrintGStats("ManipulateNodesEdges:Graph1",Graph1);

  // save the graph
  {
    TFOut FOut(FName);
    Graph->Save(FOut);
    FOut.Flush();
  }

  // load the graph
  {
    TFIn FIn(FName);
    Graph2 = TNGraph::Load(FIn);
  }
  PrintGStats("ManipulateNodesEdges:Graph2",Graph2);

  // remove all the nodes and edges
  for (i = 0; i < NNodes; i++) {
    n = Graph->GetRndNId();
    Graph->DelNode(n);
  }

  PrintGStats("ManipulateNodesEdges:Graph",Graph);

  Graph1->Clr();
  PrintGStats("ManipulateNodesEdges:Graph1",Graph1);
}

//.........这里部分代码省略.........
    y = (long) (drand48() * NNodes);
    // Graph->GetEdges() is not correct for the loops (x == y),
    // skip the loops in this test
    if (x != y  &&  !Graph->IsEdge(x,y)) {
      n = Graph->AddEdge(x, y);
      NCount--;
    }
  }

  EXPECT_EQ(NEdges,Graph->GetEdges());

  EXPECT_EQ(0,Graph->Empty());
  EXPECT_EQ(1,Graph->IsOk());

  for (i = 0; i < NNodes; i++) {
    EXPECT_EQ(1,Graph->IsNode(i));
  }

  EXPECT_EQ(0,Graph->IsNode(NNodes));
  EXPECT_EQ(0,Graph->IsNode(NNodes+1));
  EXPECT_EQ(0,Graph->IsNode(2*NNodes));

  // nodes iterator
  NCount = 0;
  for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
    NCount++;
  }
  EXPECT_EQ(NNodes,NCount);

  // edges per node iterator
  NCount = 0;
  for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
    for (int e = 0; e < NI.GetOutDeg(); e++) {
      NCount++;
    }
  }
  EXPECT_EQ(NEdges,NCount);

  // edges iterator
  NCount = 0;
  for (TNGraph::TEdgeI EI = Graph->BegEI(); EI < Graph->EndEI(); EI++) {
    NCount++;
  }
  EXPECT_EQ(NEdges,NCount);

  // node degree
  for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
    Deg = NI.GetDeg();
    InDeg = NI.GetInDeg();
    OutDeg = NI.GetOutDeg();

    EXPECT_EQ(Deg,InDeg+OutDeg);
  }

  // assignment
  Graph1 = TNGraph::New();
  *Graph1 = *Graph;

  EXPECT_EQ(NNodes,Graph1->GetNodes());
  EXPECT_EQ(NEdges,Graph1->GetEdges());
  EXPECT_EQ(0,Graph1->Empty());
  EXPECT_EQ(1,Graph1->IsOk());

  // saving and loading
  {
    TFOut FOut(FName);
    Graph->Save(FOut);
    FOut.Flush();
  }

  {
    TFIn FIn(FName);
    Graph2 = TNGraph::Load(FIn);
  }

  EXPECT_EQ(NNodes,Graph2->GetNodes());
  EXPECT_EQ(NEdges,Graph2->GetEdges());
  EXPECT_EQ(0,Graph2->Empty());
  EXPECT_EQ(1,Graph2->IsOk());

  // remove all the nodes and edges
  for (i = 0; i < NNodes; i++) {
    n = Graph->GetRndNId();
    Graph->DelNode(n);
  }

  EXPECT_EQ(0,Graph->GetNodes());
  EXPECT_EQ(0,Graph->GetEdges());

  EXPECT_EQ(1,Graph->IsOk());
  EXPECT_EQ(1,Graph->Empty());

  Graph1->Clr();

  EXPECT_EQ(0,Graph1->GetNodes());
  EXPECT_EQ(0,Graph1->GetEdges());

  EXPECT_EQ(1,Graph1->IsOk());
  EXPECT_EQ(1,Graph1->Empty());
}