void SolveKarpSubproblems()
{
Node *N;
int i;
double EntryTime = GetTime();
AllocateStructures();
ReadPenalties();
/* Compute upper bound for the original problem */
GlobalBestCost = 0;
N = FirstNode;
do {
if (!Fixed(N, N->SubproblemSuc))
GlobalBestCost += Distance(N, N->SubproblemSuc);
N->Subproblem = 0;
}
while ((N = N->BestSuc = N->SubproblemSuc) != FirstNode);
if (TraceLevel >= 1) {
if (TraceLevel >= 2)
printff("\n");
printff("*** Karp partitioning *** [Cost = " GainFormat "]\n",
GlobalBestCost);
}
if (WeightType == GEO || WeightType == GEOM ||
WeightType == GEO_MEEUS || WeightType == GEOM_MEEUS) {
N = FirstNode;
do {
N->Xc = N->X;
N->Yc = N->Y;
N->Zc = N->Z;
if (WeightType == GEO || WeightType == GEO_MEEUS)
GEO2XYZ(N->Xc, N->Yc, &N->X, &N->Y, &N->Z);
else
GEOM2XYZ(N->Xc, N->Yc, &N->X, &N->Y, &N->Z);
} while ((N = N->SubproblemSuc) != FirstNode);
CoordType = THREED_COORDS;
}
KDTree = BuildKDTree();
if (WeightType == GEO || WeightType == GEOM ||
WeightType == GEO_MEEUS || WeightType == GEOM_MEEUS) {
N = FirstNode;
do {
N->X = N->Xc;
N->Y = N->Yc;
N->Z = N->Zc;
} while ((N = N->SubproblemSuc) != FirstNode);
CoordType = TWOD_COORDS;
}
CurrentSubproblem = 0;
Subproblems = 1;
for (i = Dimension - 1; i > SubproblemSize; i /= 2)
Subproblems *= 2;
RestrictedSearchSaved = RestrictedSearch;
KarpPartition(0, Dimension - 1, 0);
free(KDTree);
printff("\nCost = " GainFormat, GlobalBestCost);
if (Optimum != MINUS_INFINITY && Optimum != 0)
printff(", Gap = %0.3f%%",
100.0 * (GlobalBestCost - Optimum) / Optimum);
printff(", Time = %0.1f sec. %s\n", fabs(GetTime() - EntryTime),
GlobalBestCost < Optimum ? "<" : GlobalBestCost ==
Optimum ? "=" : "");
if (SubproblemBorders && Subproblems > 1)
SolveSubproblemBorderProblems(Subproblems);
}
static void MarkBorderPoints(int CurrentSubproblem, LKH::LKHAlg * Alg)
{
double Min[3], Max[3];
int dMin, dMax, d, i, axis, ActualSubproblemSize = 0, Size = 0;
LKH::LKHAlg::Node **A, *N;
assert(A = (LKH::LKHAlg::Node **) malloc(Alg->DimensionSaved * sizeof(LKH::LKHAlg::Node *)));
Min[0] = Min[1] = Min[2] = DBL_MAX;
Max[0] = Max[1] = Max[2] = -DBL_MAX;
if (Alg->WeightType == LKH::GEO || Alg->WeightType == LKH::GEOM ||
Alg->WeightType == LKH::GEO_MEEUS || Alg->WeightType == LKH::GEOM_MEEUS) {
N = Alg->FirstNode;
do {
N->Xc = N->X;
N->Yc = N->Y;
N->Zc = N->Z;
if (Alg->WeightType == LKH::GEO || Alg->WeightType == LKH::GEO_MEEUS)
GEO2XYZ(N->Xc, N->Yc, &N->X, &N->Y, &N->Z);
else
GEOM2XYZ(N->Xc, N->Yc, &N->X, &N->Y, &N->Z);
} while ((N = N->SubproblemSuc) != Alg->FirstNode);
Alg->CoordType = LKH::THREED_COORDS;
}
N = Alg->FirstNode;
do {
if (N->Subproblem == CurrentSubproblem) {
for (i = Alg->CoordType == LKH::THREED_COORDS ? 2 : 1; i >= 0; i--) {
if (Coord(N, i) < Min[i])
Min[i] = Coord(N, i);
if (Coord(N, i) > Max[i])
Max[i] = Coord(N, i);
}
ActualSubproblemSize++;
}
} while ((N = N->SubproblemSuc) != Alg->FirstNode);
do {
if (N->Subproblem == CurrentSubproblem ||
(N->X >= Min[0] && N->X <= Max[0] &&
N->Y >= Min[1] && N->Y <= Max[1] &&
(Alg->CoordType == LKH::TWOD_COORDS ||
(N->Z >= Min[2] && N->Z <= Max[2])))) {
N->Rank = INT_MAX;
for (i = Alg->CoordType == LKH::THREED_COORDS ? 2 : 1; i >= 0; i--) {
dMin = (int) (fabs(Coord(N, i) - Min[i]) + 0.5);
dMax = (int) (fabs(Coord(N, i) - Max[i]) + 0.5);
d = dMin < dMax ? dMin : dMax;
if (d < N->Rank)
N->Rank = d;
}
} else {
axis = -1;
if (Alg->CoordType == LKH::TWOD_COORDS) {
if (N->X >= Min[0] && N->X <= Max[0])
axis = 1;
else if (N->Y >= Min[1] && N->Y <= Max[1])
axis = 0;
} else if (N->X >= Min[0] && N->X <= Max[0]) {
if (N->Y >= Min[1] && N->Y <= Max[1])
axis = 2;
else if (N->Z >= Min[2] && N->Z <= Max[2])
axis = 1;
} else if (N->Y >= Min[1] && N->Y <= Max[1] &&
N->Z >= Min[2] && N->Z <= Max[2])
axis = 0;
if (axis != -1) {
dMin = (int) (fabs(Coord(N, axis) - Min[axis]) + 0.5);
dMax = (int) (fabs(Coord(N, axis) - Max[axis]) + 0.5);
N->Rank = dMin < dMax ? dMin : dMax;
} else {
N->Rank = 0;
for (i = Alg->CoordType == LKH::THREED_COORDS ? 2 : 1; i >= 0; i--) {
dMin = (int) (fabs(Coord(N, i) - Min[i]) + 0.5);
dMax = (int) (fabs(Coord(N, i) - Max[i]) + 0.5);
d = dMin < dMax ? dMin : dMax;
if (d > N->Rank)
N->Rank = d;
}
}
}
N->Subproblem = 0;
if (!Alg->SubproblemsCompressed ||
((N->SubproblemPred != N->SubBestPred ||
N->SubproblemSuc != N->SubBestSuc) &&
(N->SubproblemPred != N->SubBestSuc ||
N->SubproblemSuc != N->SubBestPred)))
A[Size++] = N;
} while ((N = N->SubproblemSuc) != Alg->FirstNode);
if (ActualSubproblemSize > Size)
ActualSubproblemSize = Size;
else
QuickSelect(A, Size, ActualSubproblemSize);
for (Size = 0; Size < ActualSubproblemSize; Size++)
A[Size]->Subproblem = CurrentSubproblem;
free(A);
if (Alg->WeightType == LKH::GEO || Alg->WeightType == LKH::GEOM ||
Alg-> WeightType == LKH::GEO_MEEUS || Alg->WeightType == LKH::GEOM_MEEUS) {
N = Alg->FirstNode;
do {
N->X = N->Xc;
N->Y = N->Yc;
N->Z = N->Zc;
} while ((N = N->SubproblemSuc) != Alg->FirstNode);
Alg->CoordType = LKH::TWOD_COORDS;
}
}
void SolveRoheSubproblems()
{
Node *N;
int CurrentSubproblem, Subproblems, Remaining, i;
GainType GlobalBestCost, OldGlobalBestCost;
double XMin, XMax, YMin, YMax, ZMin, ZMax, DX, DY, DZ, CLow, CMid,
CHigh;
double EntryTime = GetTime();
AllocateStructures();
ReadPenalties();
Subproblems = 0;
/* Compute upper bound for the original problem */
GlobalBestCost = 0;
N = FirstNode;
do {
if (!Fixed(N, N->SubproblemSuc))
GlobalBestCost += Distance(N, N->SubproblemSuc);
N->Subproblem = 0;
}
while ((N = N->SubproblemSuc) != FirstNode);
if (TraceLevel >= 1) {
if (TraceLevel >= 2)
printff("\n");
printff("*** Rohe partitioning *** [Cost = " GainFormat "]\n",
GlobalBestCost);
}
if (WeightType == GEO || WeightType == GEOM ||
WeightType == GEO_MEEUS || WeightType == GEOM_MEEUS) {
N = FirstNode;
do {
N->Xc = N->X;
N->Yc = N->Y;
N->Zc = N->Z;
if (WeightType == GEO || WeightType == GEO_MEEUS)
GEO2XYZ(N->Xc, N->Yc, &N->X, &N->Y, &N->Z);
else
GEOM2XYZ(N->Xc, N->Yc, &N->X, &N->Y, &N->Z);
} while ((N = N->SubproblemSuc) != FirstNode);
CoordType = THREED_COORDS;
}
N = FirstNode;
XMin = XMax = N->X;
YMin = YMax = N->Y;
ZMin = ZMax = N->Z;
while ((N = N->SubproblemSuc) != FirstNode) {
if (N->X < XMin)
XMin = N->X;
else if (N->X > XMax)
XMax = N->X;
if (N->Y < YMin)
YMin = N->Y;
else if (N->Y > YMax)
YMax = N->Y;
if (N->Z < ZMin)
ZMin = N->Z;
else if (N->Z > ZMax)
ZMax = N->Z;
}
KDTree = BuildKDTree(SubproblemSize);
Remaining = Dimension;
while (Remaining > SubproblemSize) {
N = FirstNode;
i = Random() % Remaining;
while (i--)
N = N->Suc;
DX = (0.5 + 0.5 * Random() / (PRANDMAX - 1)) * (XMax - XMin);
DY = (0.5 + 0.5 * Random() / (PRANDMAX - 1)) * (YMax - YMin);
DZ = (0.5 + 0.5 * Random() / (PRANDMAX - 1)) * (ZMax - ZMin);
CLow = 0;
CHigh = 2;
/* Binary search */
do {
CMid = (CLow + CHigh) / 2;
Size = 0;
WindowSize(N->X - CMid * DX, N->X + CMid * DX,
N->Y - CMid * DY, N->Y + CMid * DY,
N->Z - CMid * DZ, N->Z + CMid * DZ,
0, Dimension - 1);
if (Size >= 2.0 / 3 * SubproblemSize && Size <= SubproblemSize)
break;
if (Size < 2.0 / 3 * SubproblemSize)
CLow = CMid;
else
CHigh = CMid;
}
while (CHigh - CLow > DBL_EPSILON);
MakeSubproblem(N->X - CMid * DX, N->X + CMid * DX,
N->Y - CMid * DY, N->Y + CMid * DY,
N->Z - CMid * DZ, N->Z + CMid * DZ,
++Subproblems, 0, Dimension - 1);
Remaining -= Size;
}
if (Remaining > 3) {
Subproblems++;
N = FirstNode;
do
N->Subproblem = Subproblems;
while ((N = N->Suc) != FirstNode);
}
if (WeightType == GEO || WeightType == GEOM || WeightType == GEO_MEEUS
|| WeightType == GEOM_MEEUS) {
N = FirstNode;
do {
N->X = N->Xc;
N->Y = N->Yc;
N->Z = N->Zc;
} while ((N = N->SubproblemSuc) != FirstNode);
CoordType = TWOD_COORDS;
}
free(KDTree);
for (CurrentSubproblem = 1;
CurrentSubproblem <= Subproblems; CurrentSubproblem++) {
OldGlobalBestCost = GlobalBestCost;
SolveSubproblem(CurrentSubproblem, Subproblems, &GlobalBestCost);
if (SubproblemsCompressed && GlobalBestCost == OldGlobalBestCost)
SolveCompressedSubproblem(CurrentSubproblem, Subproblems,
&GlobalBestCost);
}
printff("\nCost = " GainFormat, GlobalBestCost);
if (Optimum != MINUS_INFINITY && Optimum != 0)
printff(", Gap = %0.4f%%",
100.0 * (GlobalBestCost - Optimum) / Optimum);
printff(", Time = %0.1f sec. %s\n", fabs(GetTime() - EntryTime),
GlobalBestCost < Optimum ? "<" : GlobalBestCost ==
Optimum ? "=" : "");
if (SubproblemBorders && Subproblems > 1)
SolveSubproblemBorderProblems(Subproblems, &GlobalBestCost);
}
