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Best5OptMove.c
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Best5OptMove.c
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#include "Segment.h"
#include "LKH.h"
/*
* The Best5OptMove function makes sequential edge exchanges. If possible, it
* makes an r-opt move (r <= 5) that improves the tour. Otherwise, it makes
* the most promising 5-opt move that fulfils the positive gain criterion.
* To prevent an infinity chain of moves the last edge in a 5-opt move must
* not previously have been included in the chain.
*
* The edge (t1,t2) is the first edge to be exchanged. G0 is a pointer to the
* accumulated gain.
*
* In case a r-opt move is found that improves the tour, the improvement of
* the cost is made available to the caller through the parameter Gain.
* If *Gain > 0, an improvement of the current tour has been found. In this
* case the function returns 0.
*
* Otherwise, the best 5-opt move is made, and a pointer to the node that was
* connected to t1 (in order to close the tour) is returned. The new
* accumulated gain is made available to the caller through the parameter G0.
*
* The function is called from the LinKernighan function.
*/
/*
The algorithm splits the set of possible moves up into a number disjoint
subsets (called "cases"). When t1, t2, ..., t6 has been chosen, Case6 is
used to discriminate between 8 cases. When t1, t2, ..., t8 has been chosen,
Case8 is used to discriminate between 16 cases. When t1, t2, ..., t10 has
been chosen, Case10 is used to discriminate between 52 cases.
A description of the cases is given after the code.
*/
Node* Best5OptMove(Node* t1, Node* t2, GainType* G0, GainType* Gain)
{
Node* t3, * t4, * t5, * t6 = 0, * t7, * t8 = 0, * t9 = 0, * t10 = 0;
Node* T3 = 0, * T4 = 0, * T5 = 0, * T6 = 0, * T7 = 0, * T8 = 0, * T9 = 0,
* T10 = 0;
Candidate* Nt2, * Nt4, * Nt6, * Nt8;
GainType G1, G2, G3, G4, G5, G6, G7, G8, BestG8 = MINUS_INFINITY;
int Case6 = 0, Case8 = 0, Case10 = 0, BestCase10 = 0, X4, X6, X8, X10,
BTW275 = 0, BTW674 = 0, BTW571 = 0, BTW376 = 0, BTW574 = 0,
BTW671 = 0, BTW471 = 0, BTW673 = 0, BTW573 = 0, BTW273 = 0;
int Breadth2 = 0, Breadth4, Breadth6, Breadth8;
double R2, R4, R6, R8, V;
double Alpha2 = 0.1, Gama = 0.9;
if (t2 != SUC(t1))
Reversed ^= 1;
/* Determine (T3,T4,T5,T6,T7,T8,T9,T10) = (t3,t4,t5,t6,t7,t8,t9,t10)
such that
G8 = *G0 - C(t2,T3) + C(T3,T4) - C(T4,T5) + C(T5,T6) - C(T6,T7) +
C(T7,T8) - C(T8,T9) + C(T9,T10)
is maximum (= BestG8), and (T9,T10) has not previously been included.
If during this process a legal move with *Gain > 0 is found, then
make the move and exit Best5OptMove immediately. */
/* Choose (t2,t3) as a candidate edge emanating from t2 */
Candidate* Ntt2;
int rest_pts[1000];
int number = 0;
for (Ntt2 = t2->CandidateSet; Ntt2->To; Ntt2++) {
rest_pts[number] = number;
number++;
}
int point = 0;
int number2 = number;
for (Nt2 = t2->CandidateSet; (t3 = Nt2->To); Nt2++) {
double dtemp = Random() % 100;
if (dtemp > epsilon) {
point = 0;
int itemp = rest_pts[point];
Ntt2 = t2->CandidateSet + itemp;
t3 = Ntt2->To;
}
else {
point = Random() % number2;
int itemp = rest_pts[point];
Ntt2 = t2->CandidateSet + itemp;
t3 = Ntt2->To;
}
if (point < number2 - 1) {
for (int k = point; k < number2 - 1; k++) {
rest_pts[k] = rest_pts[k + 1];
}
}
number2--;
if (t3 == t2->Pred || t3 == t2->Suc ||
((G1 = *G0 - Ntt2->Cost) <= 0 && GainCriterionUsed &&
ProblemType != HCP && ProblemType != HPP))
continue;
if (++Breadth2 > MaxBreadth)
break;
R2 = (double)(C(t1, t2) - Ntt2->Cost);
/* Choose t4 as one of t3's two neighbors on the tour */
for (X4 = ProblemType == ATSP ? 2 : 1; X4 <= 2; X4++) {
t4 = X4 == 1 ? PRED(t3) : SUC(t3);
if (FixedOrCommon(t3, t4))
continue;
G2 = G1 + C(t3, t4);
if (X4 == 1 && !Forbidden(t4, t1) &&
(!c || G2 - c(t4, t1) > 0) && (*Gain = G2 - C(t4, t1)) > 0)
{
Make2OptMove(t1, t2, t3, t4);
if (Method == 1 || Method == 2)
Ntt2->Value = (1 - Alpha2) * Ntt2->Value + Alpha2 * (R2 + C(t3, t4) - C(t4, t1));
else
Ntt2->Value = *Gain - *G0 + C(t1, t2);
for (Candidate* NFrom = t2->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t2->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
return 0;
}
if (Method == 1) {
V = t4->CandidateSet[0].Value;
Ntt2->Value = (1 - Alpha2) * Ntt2->Value + Alpha2 * (R2 + Gama * V);
for (Candidate* NFrom = t2->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t2->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
if (Backtracking && !Excludable(t3, t4))
continue;
Breadth4 = 0;
/* Choose (t4,t5) as a candidate edge emanating from t4 */
Candidate* Ntt4;
int rest_pts4[1000];
int number3 = 0;
for (Ntt4 = t4->CandidateSet; Ntt4->To; Ntt4++) {
rest_pts4[number3] = number3;
number3++;
}
int point4 = 0;
int number4 = number3;
for (Nt4 = t4->CandidateSet; (t5 = Nt4->To); Nt4++) {
dtemp = Random() % 100;
if (dtemp > epsilon) {
point4 = 0;
int itemp = rest_pts4[point4];
Ntt4 = t4->CandidateSet + itemp;
t5 = Ntt4->To;
}
else {
point4 = Random() % number4;
int itemp = rest_pts4[point4];
Ntt4 = t4->CandidateSet + itemp;
t5 = Ntt4->To;
}
if (point4 < number4 - 1) {
for (int k = point4; k < number4 - 1; k++) {
rest_pts4[k] = rest_pts4[k + 1];
}
}
number4--;
if (t5 == t4->Pred || t5 == t4->Suc ||
((G3 = G2 - Ntt4->Cost) <= 0 && GainCriterionUsed &&
ProblemType != HCP && ProblemType != HPP))
continue;
if (++Breadth4 > MaxBreadth)
break;
if (Method == 2) {
for (Candidate* Nttemp = t4->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t5) {
V = Nttemp->Value; break;
}
}
Ntt2->Value = (1 - Alpha2) * Ntt2->Value + Alpha2 * (R2 + Gama * V);
for (Candidate* NFrom = t2->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t2->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
R4 = (double)(C(t3, t4) - Ntt4->Cost);
/* Choose t6 as one of t5's two neighbors on the tour */
for (X6 = 1; X6 <= 2; X6++) {
if (X4 == 1) {
if (X6 == 1) {
Case6 = 1 + !BETWEEN(t2, t5, t4);
t6 = Case6 == 1 ? SUC(t5) : PRED(t5);
}
else {
t6 = t6 == t5->Pred ? t5->Suc : t5->Pred;
if ((t5 == t1 && t6 == t2) ||
(t5 == t2 && t6 == t1))
continue;
Case6 += 2;
}
}
else if (BETWEEN(t2, t5, t3)) {
Case6 = 4 + X6;
t6 = X6 == 1 ? SUC(t5) : PRED(t5);
if (t6 == t1)
continue;
}
else {
Case6 = 6 + X6;
t6 = X6 == 1 ? PRED(t5) : SUC(t5);
if (t6 == t2)
continue;
}
if (FixedOrCommon(t5, t6))
continue;
G4 = G3 + C(t5, t6);
if ((Case6 <= 2 || Case6 == 5 || Case6 == 6) &&
!Forbidden(t6, t1) &&
(!c || G4 - c(t6, t1) > 0) &&
(*Gain = G4 - C(t6, t1)) > 0) {
Make3OptMove(t1, t2, t3, t4, t5, t6, Case6);
if (Method == 1 || Method == 2) {
Ntt4->Value = (1 - Alpha2) * Ntt4->Value + Alpha2 * (R4 + C(t5, t6) - C(t6, t1));
for (Candidate* NFrom = t4->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t4->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
else {
for (Candidate* Nttemp = t2->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t3) {
Ntt2 = Nttemp; break;
}
Ntt2->Value = *Gain - *G0 + C(t1, t2);
for (Candidate* NFrom = t2->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t2->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
for (Candidate* Nttemp = t4->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t5) {
Ntt4 = Nttemp; break;
}
Ntt4->Value = *Gain - G2 + C(t3, t4);
for (Candidate* NFrom = t4->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t4->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
}
return 0;
}
if (Method == 1) {
V = t6->CandidateSet[0].Value;
Ntt4->Value = (1 - Alpha2) * Ntt4->Value + Alpha2 * (R4 + Gama * V);
for (Candidate* NFrom = t4->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t4->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
if (Backtracking && !Excludable(t5, t6))
continue;
Breadth6 = 0;
/* Choose (t6,t7) as a candidate edge emanating from t6 */
Candidate* Ntt6;
int rest_pts6[1000];
int number5 = 0;
for (Ntt6 = t6->CandidateSet; Ntt6->To; Ntt6++) {
rest_pts6[number5] = number5;
number5++;
}
int point6 = 0;
int number6 = number5;
for (Nt6 = t6->CandidateSet; (t7 = Nt6->To); Nt6++) {
dtemp = Random() % 100;
if (dtemp > epsilon) {
point6 = 0;
int itemp = rest_pts6[point6];
Ntt6 = t6->CandidateSet + itemp;
t7 = Ntt6->To;
}
else {
point6 = Random() % number6;
int itemp = rest_pts6[point6];
Ntt6 = t6->CandidateSet + itemp;
t7 = Ntt6->To;
}
if (point6 < number6 - 1) {
for (int k = point6; k < number6 - 1; k++) {
rest_pts6[k] = rest_pts6[k + 1];
}
}
number6--;
if (t7 == t6->Pred || t7 == t6->Suc ||
(t6 == t2 && t7 == t3) ||
(t6 == t3 && t7 == t2) ||
((G5 = G4 - Ntt6->Cost) <= 0 &&
GainCriterionUsed &&
ProblemType != HCP && ProblemType != HPP))
continue;
if (++Breadth6 > MaxBreadth)
break;
if (Method == 2) {
for (Candidate* Nttemp = t6->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t7) {
V = Nttemp->Value; break;
}
}
Ntt4->Value = (1 - Alpha2) * Ntt4->Value + Alpha2 * (R4 + Gama * V);
for (Candidate* NFrom = t4->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t4->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
R6 = (double)(C(t5, t6) - Ntt6->Cost);
/* Choose t8 as one of t7's two neighbors on the tour */
for (X8 = 1; X8 <= 2; X8++) {
if (X8 == 1) {
Case8 = Case6;
switch (Case6) {
case 1:
if ((BTW275 = BETWEEN(t2, t7, t5)))
t8 = SUC(t7);
else {
t8 = PRED(t7);
BTW674 = BETWEEN(t6, t7, t4);
}
break;
case 2:
if ((BTW376 = BETWEEN(t3, t7, t6)))
t8 = SUC(t7);
else {
t8 = PRED(t7);
BTW571 = BETWEEN(t5, t7, t1);
}
break;
case 3:
t8 = SUC(t7);
BTW574 = BETWEEN(t5, t7, t4);
break;
case 4:
if ((BTW671 = BETWEEN(t6, t7, t1)))
t8 = PRED(t7);
else
t8 = BETWEEN(t2, t7,
t4) ? SUC(t7) :
PRED(t7);
break;
case 5:
t8 = PRED(t7);
BTW471 = BETWEEN(t4, t7, t1);
if (!BTW471)
BTW673 = BETWEEN(t6, t7, t3);
break;
case 6:
if ((BTW471 = BETWEEN(t4, t7, t1)))
t8 = PRED(t7);
else {
t8 = SUC(t7);
BTW573 = BETWEEN(t5, t7, t3);
}
break;
case 7:
case 8:
t8 = SUC(t7);
BTW273 = BETWEEN(t2, t7, t3);
break;
}
}
else {
t8 = t8 == t7->Pred ? t7->Suc : t7->Pred;
Case8 += 8;
}
if ((t7 == t1 && t8 == t2) ||
(t7 == t2 && t8 == t1) ||
(t7 == t3 && t8 == t4) ||
(t7 == t4 && t8 == t3))
continue;
if (FixedOrCommon(t7, t8))
continue;
if (Case6 == 3 && !BTW574 &&
(X8 == 1) == BETWEEN(t3, t7, t1))
continue;
if (Case6 == 4 && BTW671 && X8 == 2)
break;
if (Case6 == 7 && !BTW273 &&
(X8 == 1) == BETWEEN(t5, t7, t1))
continue;
if (Case6 == 8 && !BTW273 &&
!BETWEEN(t4, t7, t5))
break;
G6 = G5 + C(t7, t8);
if (t8 != t1 &&
(Case6 == 3 ? BTW574 :
Case6 == 4 ? !BTW671 :
Case6 == 7 ? BTW273 :
Case6 != 8 && X8 == 1) &&
!Forbidden(t8, t1) &&
(!c || G6 - c(t8, t1) > 0) &&
(*Gain = G6 - C(t8, t1)) > 0) {
Make4OptMove(t1, t2, t3, t4, t5, t6, t7,
t8, Case8);
if (Method == 1 || Method == 2) {
Ntt6->Value = (1 - Alpha2) * Ntt6->Value + Alpha2 * (R6 + C(t7, t8) - C(t8, t1));
for (Candidate* NFrom = t6->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t6->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
if (Method == 3) {
for (Candidate* Nttemp = t2->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t3) {
Ntt2 = Nttemp; break;
}
Ntt2->Value = *Gain - *G0 + C(t1, t2);
for (Candidate* NFrom = t2->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t2->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
for (Candidate* Nttemp = t4->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t5) {
Ntt4 = Nttemp; break;
}
Ntt4->Value = *Gain - G2 + C(t3, t4);
for (Candidate* NFrom = t4->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t4->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
for (Candidate* Nttemp = t6->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t7) {
Ntt6 = Nttemp; break;
}
Ntt6->Value = *Gain - G4 + C(t5, t6);
for (Candidate* NFrom = t6->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t6->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
}
return 0;
}
if (Method == 1) {
V = t8->CandidateSet[0].Value;
Ntt6->Value = (1 - Alpha2) * Ntt6->Value + Alpha2 * (R6 + Gama * V);
for (Candidate* NFrom = t6->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t6->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
if (Backtracking && !Excludable(t7, t8))
continue;
Breadth8 = 0;
/* Choose (t8,t9) as a candidate edge emanating
from t8 */
Candidate* Ntt8;
int number7 = 0;
int rest_pts8[100];
for (Ntt8 = t8->CandidateSet; Ntt8->To; Ntt8++) {
rest_pts8[number7] = number7;
number7++;
}
int point8 = 0;
int number8 = number7;
for (Nt8 = t8->CandidateSet; (t9 = Nt8->To);
Nt8++) {
dtemp = Random() % 100;
if (dtemp > epsilon) {
point8 = 0;
int itemp = rest_pts8[point8];
Ntt8 = t8->CandidateSet + itemp;
t9 = Ntt8->To;
}
else {
point8 = Random() % number8;
int itemp = rest_pts8[point8];
Ntt8 = t8->CandidateSet + itemp;
t9 = Ntt8->To;
}
if (point8 < number8 - 1) {
for (int k = point8; k < number8 - 1; k++) {
rest_pts8[k] = rest_pts8[k + 1];
}
}
number8--;
if (t9 == t8->Pred || t9 == t8->Suc ||
t9 == t1 ||
(t8 == t2 && t9 == t3) ||
(t8 == t3 && t9 == t2) ||
(t8 == t4 && t9 == t5) ||
(t8 == t5 && t9 == t4) ||
((G7 = G6 - Ntt8->Cost) <= 0 &&
GainCriterionUsed &&
ProblemType != HCP &&
ProblemType != HPP))
continue;
if (++Breadth8 > MaxBreadth)
break;
if (Method == 2) {
for (Candidate* Nttemp = t8->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t9) {
V = Nttemp->Value; break;
}
}
Ntt6->Value = (1 - Alpha2) * Ntt6->Value + Alpha2 * (R6 + Gama * V);
for (Candidate* NFrom = t6->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t6->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
R8 = (double)(C(t7, t8) - Ntt8->Cost);
/* Choose t10 as one of t9's two neighbors
on the tour */
for (X10 = 1; X10 <= 2; X10++) {
if (X10 == 1) {
t10 = 0;
switch (Case8) {
case 1:
t10 = (BTW275 ?
BETWEEN(t8, t9, t5)
|| BETWEEN(t3, t9,
t1) : BTW674
? BETWEEN(t7, t9,
t1) :
BETWEEN(t7, t9,
t5)) ? PRED(t9)
: SUC(t9);
Case10 = 22;
break;
case 2:
t10 = (BTW376 ?
BETWEEN(t8, t9, t4) :
BTW571 ?
BETWEEN(t7, t9, t1)
|| BETWEEN(t3, t9,
t6) :
BETWEEN(t7, t9,
t1)) ? PRED(t9)
: SUC(t9);
Case10 = 23;
break;
case 3:
if (BTW574) {
t10 = BETWEEN(t5, t9, t1) ?
PRED(t9) : SUC(t9);
Case10 = 24;
break;
}
if (!BETWEEN(t5, t9, t4))
break;
t10 = SUC(t9);
Case10 = 1;
break;
case 4:
if (BTW671) {
if (!BETWEEN(t2, t9, t5))
break;
t10 = SUC(t9);
Case10 = 2;
break;
}
t10 = BETWEEN(t6, t9, t4) ?
PRED(t9) : SUC(t9);
Case10 = 25;
break;
case 5:
t10 = (BTW471 ?
BETWEEN(t7, t9, t1) :
BTW673 ?
BETWEEN(t7, t9, t5) :
BETWEEN(t4, t9, t1)
|| BETWEEN(t7, t9,
t5)) ?
PRED(t9) : SUC(t9);
Case10 = 26;
break;
case 6:
t10 = (BTW471 ?
BETWEEN(t7, t9, t3) :
BTW573 ?
BETWEEN(t8, t9, t6) :
BETWEEN(t4, t9, t1)
|| BETWEEN(t8, t9,
t6)) ?
PRED(t9) : SUC(t9);
Case10 = 27;
break;
case 7:
if (BTW273) {
t10 = BETWEEN(t5, t9, t3) ?
PRED(t9) : SUC(t9);
Case10 = 28;
break;
}
if (!BETWEEN(t2, t9, t3))
break;
t10 = SUC(t9);
Case10 = 3;
break;
case 8:
if (BTW273) {
if (!BETWEEN(t4, t9, t5))
break;
Case10 = 4;
}
else {
if (!BETWEEN(t2, t9, t3))
break;
Case10 = 5;
}
t10 = SUC(t9);
break;
case 9:
if (BTW275) {
if (!BETWEEN(t7, t9, t4))
break;
t10 = SUC(t9);
Case10 = 6;
break;
}
if (!BTW674) {
if (!BETWEEN(t2, t9, t7))
break;
t10 = SUC(t9);
Case10 = 7;
break;
}
if (!BETWEEN(t6, t9, t7))
break;
t10 = SUC(t9);
Case10 = 8;
break;
case 10:
if (BTW376) {
if (!BETWEEN(t7, t9, t6))
break;
t10 = SUC(t9);
Case10 = 9;
break;
}
if (BTW571) {
if (!BETWEEN(t2, t9, t7))
break;
t10 = SUC(t9);
Case10 = 10;
break;
}
if (!BETWEEN(t3, t9, t6) &&
!BETWEEN(t2, t9, t7))
break;
t10 = SUC(t9);
Case10 = 11;
break;
case 11:
if (BTW574) {
t10 = BETWEEN(t3, t9, t1) ?
PRED(t9) : SUC(t9);
Case10 = 29;
break;
}
if (!BETWEEN(t5, t9, t4))
break;
t10 = SUC(t9);
Case10 = 12;
break;
case 12:
t10 = BETWEEN(t3, t9, t1) ?
PRED(t9) : SUC(t9);
Case10 = 30;
break;
case 13:
if (BTW471) {
if (!BETWEEN(t2, t9, t7))
break;
t10 = SUC(t9);
Case10 = 13;
break;
}
if (BTW673) {
if (!BETWEEN(t6, t9, t7))
break;
t10 = SUC(t9);
Case10 = 14;
break;
}
if (!BETWEEN(t6, t9, t3) &&
!BETWEEN(t2, t9, t7))
break;
t10 = SUC(t9);
Case10 = 15;
break;
case 14:
if (BTW471) {
if (!BETWEEN(t2, t9, t7))
break;
t10 = SUC(t9);
Case10 = 16;
break;
}
if (BTW573) {
if (!BETWEEN(t7, t9, t3) &&
!BETWEEN(t2, t9, t6))
break;
t10 = SUC(t9);
Case10 = 17;
break;
}
if (!BETWEEN(t7, t9, t6))
break;
t10 = SUC(t9);
Case10 = 18;
break;
case 15:
if (BTW273) {
t10 = BETWEEN(t5, t9, t1) ?
PRED(t9) : SUC(t9);
Case10 = 31;
break;
}
if (!BETWEEN(t2, t9, t3))
break;
t10 = SUC(t9);
Case10 = 19;
break;
case 16:
if (BTW273) {
if (!BETWEEN(t4, t9, t5))
break;
Case10 = 20;
}
else {
if (!BETWEEN(t2, t9, t3))
break;
Case10 = 21;
}
t10 = SUC(t9);
break;
}
if (!t10)
break;
}
else {
if (Case10 >= 22)
continue;
Case10 += 31;
t10 =
t10 ==
t9->Pred ? t9->Suc : t9->Pred;
}
if (t10 == t1 ||
(t9 == t3 && t10 == t4) ||
(t9 == t4 && t10 == t3) ||
(t9 == t5 && t10 == t6) ||
(t9 == t6 && t10 == t5))
continue;
if (FixedOrCommon(t9, t10))
continue;
G8 = G7 + C(t9, t10);
if (Method == 1 || Method == 2) {
Ntt8->Value = (1 - Alpha2) * Ntt8->Value + Alpha2 * (R8 + C(t7, t8) - C(t8, t1));
for (Candidate* NFrom = t8->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t8->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
V = -C(t1, t2) + C(t2, t3) - C(t3, t4) + C(t4, t5) - C(t5, t6) + C(t6, t7) - C(t7, t8) + C(t8, t9) - C(t9, t10) + C(t10, t1);
if (Method == 3) {
for (Candidate* Nttemp = t2->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t3) {
Ntt2 = Nttemp; break;
}
Ntt2->Value = V - *G0 + C(t1, t2);
for (Candidate* NFrom = t2->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t2->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
for (Candidate* Nttemp = t4->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t5) {
Ntt4 = Nttemp; break;
}
Ntt4->Value = V - G2 + C(t3, t4);
for (Candidate* NFrom = t4->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t4->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
for (Candidate* Nttemp = t6->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t7) {
Ntt6 = Nttemp; break;
}
Ntt6->Value = V - G4 + C(t5, t6);
for (Candidate* NFrom = t6->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t6->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
for (Candidate* Nttemp = t8->CandidateSet; Nttemp->To; Nttemp++) {
if (Nttemp->To == t9) {
Ntt8 = Nttemp; break;
}
Ntt8->Value = V - G6 + C(t7, t8);
for (Candidate* NFrom = t8->CandidateSet; NFrom->To; NFrom++) {
Candidate Temp = *NFrom;
Candidate* NN;
for (NN = NFrom - 1;
NN >= t8->CandidateSet &&
(Temp.Value > NN->Value ||
(Temp.Value == NN->Value && Temp.Alpha < NN->Alpha)); NN--)
*(NN + 1) = *NN;
*(NN + 1) = Temp;
}
}
}
if (!Forbidden(t10, t1) &&
(!c || G8 - c(t10, t1) > 0) &&
(*Gain = G8 - C(t10, t1)) > 0) {
Make5OptMove(t1, t2, t3, t4, t5,
t6, t7, t8, t9, t10,
Case10);
return 0;
}
if (GainCriterionUsed &&
G8 - Precision < t10->Cost)
continue;
if (!Backtracking || Swaps > 0) {
if ((G8 > BestG8 ||
(G8 == BestG8
&& !Near(t9, t10)
&& Near(T9, T10)))
&& Swaps < MaxSwaps
&& Excludable(t9, t10)
&& !InInputTour(t9, t10)) {
/* Ignore the move if the gain
does not vary */
if (RestrictedSearch &&
ProblemType != HCP &&
ProblemType != HPP &&
G2 - t4->Pi == G4 - t6->Pi
&& G4 - t6->Pi ==
G6 - t8->Pi
&& G6 - t8->Pi ==
G8 - t10->Pi
&& G3 + t5->Pi ==
G1 + t3->Pi
&& G5 + t7->Pi ==
G3 + t5->Pi
&& G7 + t9->Pi ==
G5 + t7->Pi)
continue;
T3 = t3;
T4 = t4;
T5 = t5;
T6 = t6;
T7 = t7;
T8 = t8;
T9 = t9;
T10 = t10;
BestCase10 = Case10;
BestG8 = G8;
}
}
else if (MaxSwaps > 0) {
GainType G = G8;
Node* t = t10;
Make5OptMove(t1, t2, t3, t4, t5,
t6, t7, t8, t9, t10,
Case10);
Exclude(t1, t2);
Exclude(t3, t4);
Exclude(t5, t6);
Exclude(t7, t8);
Exclude(t9, t10);
while ((t =
BestSubsequentMove(t1, t,
&G,
Gain)));
if (*Gain > 0)
return 0;
RestoreTour();
if (t2 != SUC(t1))
Reversed ^= 1;
}
}
}
}
}
}
}
}
}