TPRManager(PNEANet &Net) : Net(Net), CapIndex(0), FlowV(Net->GetMxEId()), ExcessV(Net->GetMxNId()), EdgeNumsV(Net->GetMxNId()), LabelsV(Net->GetMxNId()), LabelCounts(Net->GetNodes() + 1), LabelLimit(0), MaxLabel(Net->GetNodes()), ActiveNodeSet(Net->GetMxNId()), ActiveCount(0) {
CapIndex = Net->GetIntAttrIndE(CapAttrName);
for (int i = 0; i <= Net->GetNodes(); i++) { LabelCounts[i] = 0; }
for (TNEANet::TEdgeI EI = Net->BegEI(); EI != Net->EndEI(); EI++) {
int EId = EI.GetId();
IAssert(Capacity(EId) >= 0);
FlowV[EId] = 0;
}
for (TNEANet::TNodeI NI = Net->BegNI(); NI != Net->EndNI(); NI++) {
int NId = NI.GetId();
ExcessV[NId] = 0;
EdgeNumsV[NId] = 0;
ActiveNodeSet[NId] = 0;
}
LabelCounts[0] = Net->GetNodes();
}
int GetMaxFlowIntEK (PNEANet &Net, const int &SrcNId, const int &SnkNId) {
IAssert(Net->IsNode(SrcNId));
IAssert(Net->IsNode(SnkNId));
if (SrcNId == SnkNId) { return 0; }
int CapIndex = Net->GetIntAttrIndE(CapAttrName);
TIntV Flow(Net->GetMxEId());
// Initialize flow values to 0, and make sure capacities are nonnegative
for (TNEANet::TEdgeI EI = Net->BegEI(); EI != Net->EndEI(); EI++) {
IAssert(Net->GetIntAttrIndDatE(EI, CapIndex) >= 0);
Flow[EI.GetId()] = 0;
}
// Return 0 if user attempts to flow from a node to itself.
if (SrcNId == SnkNId) { return 0; }
int MaxFlow = 0, MinAug, CurNId;
while (true) {
TIntV MidToSrcAugV; TIntV MidToSnkAugV;
TIntQ FwdNodeQ; TIntQ BwdNodeQ;
TIntH PredEdgeH; TIntH SuccEdgeH;
MinAug = FindAugV(Net, CapIndex, Flow, FwdNodeQ, PredEdgeH, BwdNodeQ, SuccEdgeH, MidToSrcAugV, MidToSnkAugV, SrcNId, SnkNId);
if (MinAug == 0) { break; }
MaxFlow += MinAug;
CurNId = SrcNId;
for (int i = MidToSrcAugV.Len() - 1; i >= 0; i--) {
int NextEId = MidToSrcAugV[i];
const TNEANet::TEdgeI &EI = Net->GetEI(NextEId);
if (EI.GetSrcNId() == CurNId) {
Flow[NextEId] += MinAug;
CurNId = EI.GetDstNId();
} else {
Flow[NextEId] -= MinAug;
CurNId = EI.GetSrcNId();
}
}
for (int i = 0; i < MidToSnkAugV.Len(); i++) {
int NextEId = MidToSnkAugV[i];
const TNEANet::TEdgeI &EI = Net->GetEI(NextEId);
if (EI.GetSrcNId() == CurNId) {
Flow[NextEId] += MinAug;
CurNId = EI.GetDstNId();
} else {
Flow[NextEId] -= MinAug;
CurNId = EI.GetSrcNId();
}
}
}
return MaxFlow;
}
