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VRP.java
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VRP.java
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package MEBEDE;
import java.util.ArrayList;
import java.util.Random;
/**
*
* @author mzaxa
*/
public class VRP {
double[][] distanceMatrix;
ArrayList<Node> allNodes;
ArrayList<Node> customers;
Random ran;
Node depot;
int numberOfCustomers;
int capacity1;
int capacity2;
Solution bestSolutionThroughTabuSearch;
public VRP(int totalCustomers, int cap1, int cap2) {
numberOfCustomers = totalCustomers;
capacity1 = cap1;
capacity2 = cap2;
ran = new Random(1);
}
void GenerateNetworkRandomly() {
CreateAllNodesAndCustomerLists(numberOfCustomers);
CalculateDistanceMatrix();
}
public void CreateAllNodesAndCustomerLists(int numberOfCustomers) {
// Create the list with the customers
customers = new ArrayList<Node>();
int birthday = 18031999;
Random ran = new Random(birthday);
for (int i = 0; i < numberOfCustomers; i++) {
Node cust = new Node();
cust.x = ran.nextInt(100);
cust.y = ran.nextInt(100);
cust.demand = 100 * (1 + ran.nextInt(5));
cust.serviceTime = 0.25;
customers.add(cust);
}
// Build the allNodes array and the corresponding distance matrix
allNodes = new ArrayList<Node>();
depot = new Node();
depot.x = 50;
depot.y = 50;
depot.demand = 0;
allNodes.add(depot);
for (int i = 0; i < customers.size(); i++) {
Node cust = customers.get(i);
allNodes.add(cust);
}
for (int i = 0; i < allNodes.size(); i++) {
Node nd = allNodes.get(i);
nd.ID = i;
}
}
public void CalculateDistanceMatrix() {
distanceMatrix = new double[allNodes.size()][allNodes.size()];
for (int i = 0; i < allNodes.size(); i++) {
Node from = allNodes.get(i);
for (int j = 0; j < allNodes.size(); j++) {
Node to = allNodes.get(j);
double Delta_x = (from.x - to.x);
double Delta_y = (from.y - to.y);
double distance = Math.sqrt((Delta_x * Delta_x) + (Delta_y * Delta_y));
distance = Math.round(distance);
distanceMatrix[i][j] = distance;
}
}
}
void Solve() {
Solution s = new Solution();
ApplyNearestNeighborMethod(s);
printSolution(s);
System.out.println(
"The total distance crossed by all the vehicles is: " + findTotalDistanceOfSolution(s) + " km");
// TabuSearch(s);
}
private void SetRoutedFlagToFalseForAllCustomers() {
for (int i = 0; i < customers.size(); i++) {
customers.get(i).isRouted = false;
}
}
private void ApplyNearestNeighborMethod(Solution solution) {
boolean modelIsFeasible = true;
ArrayList<Route> routeList1 = solution.routes1500;
ArrayList<Route> routeList2 = solution.routes1200;
SetRoutedFlagToFalseForAllCustomers();
// Q - How many insertions? A - Equal to the number of customers! Thus for i = 0
// -> customers.size()
for (int insertions = 0; insertions < customers.size();) /* the insertions will be updated in the for loop */ {
if (routeList1.size() < 15) {
int num = 1;
// A. Insertion Identification
CustomerInsertion bestInsertion = new CustomerInsertion();
bestInsertion.cost = Double.MAX_VALUE;
Route lastRoute = GetLastRoute(routeList1);
if (lastRoute != null) {
IdentifyBestInsertion_NN(bestInsertion, lastRoute);
}
// B. Insertion Application
// Feasible insertion was identified
if (bestInsertion.cost < Double.MAX_VALUE) {
ApplyCustomerInsertion(bestInsertion, solution);
insertions++;
} // C. If no insertion was feasible
else {
// C1. There is a customer with demand larger than capacity -> Infeasibility
if (lastRoute != null && lastRoute.nodes.size() == 1) {
modelIsFeasible = false;
break;
} else {
CreateAndPushAnEmptyRouteInTheSolution(solution, capacity1, num);
}
}
} else if (routeList2.size() < 15) {
int num = 2;
// A. Insertion Identification
CustomerInsertion bestInsertion = new CustomerInsertion();
bestInsertion.cost = Double.MAX_VALUE;
Route lastRoute = GetLastRoute(routeList2);
if (lastRoute != null) {
IdentifyBestInsertion_NN(bestInsertion, lastRoute);
}
// B. Insertion Application
// Feasible insertion was identified
if (bestInsertion.cost < Double.MAX_VALUE) {
ApplyCustomerInsertion(bestInsertion, solution);
insertions++;
} // C. If no insertion was feasible
else {
// C1. There is a customer with demand larger than capacity -> Infeasibility
if (lastRoute != null && lastRoute.nodes.size() == 2) {
modelIsFeasible = false;
break;
} else {
CreateAndPushAnEmptyRouteInTheSolution(solution, capacity2, num);
}
}
}
}
if (modelIsFeasible == false) {
// TODO
}
}
private void printSolution(Solution solution) {
ArrayList<Route> routes = solution.allRoutes;
int i = 0;
for (Route route : routes) {
i++;
ArrayList<Node> nodes = route.nodes;
System.out.println("In the route " + i + " the sequence of nodes is:");
for (Node node : nodes) {
System.out.println(node.ID + ",");
}
}
}
private Route GetLastRoute(ArrayList<Route> routeList) {
if (routeList.isEmpty()) {
return null;
} else {
return routeList.get(routeList.size() - 1);
}
}
private void CreateAndPushAnEmptyRouteInTheSolution(Solution currentSolution, int capacity, int routenumb) {
Route rt = new Route(capacity);
rt.nodes.add(depot);
if (routenumb == 1) {
currentSolution.routes1500.add(rt);
} else {
currentSolution.routes1200.add(rt);
}
currentSolution.allRoutes.add(rt);
}
private void ApplyCustomerInsertion(CustomerInsertion insertion, Solution solution) {
Node insertedCustomer = insertion.customer;
Route route = insertion.insertionRoute;
route.nodes.add(insertedCustomer); // add(route.nodes.size() - 1, insertedCustomer);
Node beforeInserted = route.nodes.get(route.nodes.size() - 2);
double costAdded = distanceMatrix[beforeInserted.ID][insertedCustomer.ID];
route.cost = route.cost + costAdded;
route.load = route.load + insertedCustomer.demand;
route.duration = costAdded / 35 + insertedCustomer.serviceTime;
// solution.cost = solution.cost + costAdded; It is correct but the value of the
// price of the objective unction should happen in a separate method
insertedCustomer.isRouted = true;
}
private void IdentifyBestInsertion_NN(CustomerInsertion bestInsertion, Route lastRoute) {
for (int j = 0; j < customers.size(); j++) {
// The examined node is called candidate
Node candidate = customers.get(j);
// if this candidate has not been pushed in the solution
if (candidate.isRouted == false) {
if (lastRoute.load + candidate.demand <= lastRoute.capacity) {
ArrayList<Node> nodeSequence = lastRoute.nodes;
Node lastCustomerInTheRoute = nodeSequence.get(nodeSequence.size() - 1);
double trialCost = distanceMatrix[lastCustomerInTheRoute.ID][candidate.ID];
double trialDuration = trialCost / 35 + candidate.serviceTime;
if (lastRoute.duration + trialDuration <= 3.5) {
if (trialCost < bestInsertion.cost) {
bestInsertion.customer = candidate;
bestInsertion.insertionRoute = lastRoute;
bestInsertion.cost = trialCost;
}
}
}
}
}
}
// Method calculating the value of the objective function
public double findTotalDistanceOfSolution(Solution s) {
for (int i = 0; i < s.allRoutes.size(); i++) {
s.cost = s.cost + s.allRoutes.get(i).cost;
}
return s.cost;
}
//
// public void VND() {
//
// Solution solution = new Solution();
// ArrayList<Route> routeList1500 = solution.routes1500;
// ArrayList<Route> routeList1200 = solution.routes1200;
// SetRoutedFlagToFalseForAllNodes();
// int i = 0; // insertions
// while (i < allNodes.size()) {
// if (routeList1500.size() < 15) {
// Route routeForSolution = findBestInsertion(1500);
// solution.routes1500.add(routeForSolution);
// } else if (routeList1200.size() < 15) {
// Route routeForSolution = findBestInsertion(1200);
// solution.routes1200.add(routeForSolution);
//
// }
//
// i++;
// }
//
// for (int j = 0; j < solution.routes1500.size(); j++) {
// System.out.println(solution.routes1500.get(j).duration);
// }
//
// }
//
// public Route findBestInsertion(int cap) {
//
// double arraysum, absolute, testTime, duration;
// double bestArraysum, bestAbsolute, cost, bestDuration;
// int j;
// Route route = new Route(cap);
// bestAbsolute = Double.MAX_VALUE;
// bestArraysum = Double.MAX_VALUE;
// bestDuration = Double.MAX_VALUE;
// ArrayList<Node> bestNodeSequence = new ArrayList<Node>();
//
// for (int i = 1; i < allNodes.size(); i++) {
// ArrayList<Node> nodeSequence = new ArrayList<Node>();
// nodeSequence.add(allNodes.get(0));
// j = 1;
//
// Node test = allNodes.get(i);
//
// duration = 0;
// cost = 0;
// arraysum = 0;
// testTime = 0;
// if (!test.isRouted) {
//
// while (j < allNodes.size() && arraysum <= cap && testTime <= 3.5) {
// if (j != i) {
// if (!allNodes.get(j).isRouted) {
// arraysum += distanceMatrix[i][j];
// testTime += distanceMatrix[i][j] / 35 + 0.25;
//
// if (arraysum <= cap && testTime <= 3.5) {
// nodeSequence.add(allNodes.get(j));
// cost = arraysum;
// duration = testTime;
// }
// }
// }
// j++;
// }
// absolute = cap - cost;
// if (absolute < bestAbsolute) {
// bestAbsolute = absolute;
// bestNodeSequence = nodeSequence; // node sequence
// bestArraysum = cost; // cost of sequence
// bestDuration = duration;
// }
// }
//
// }
// route.nodes = bestNodeSequence;
// route.cost = bestArraysum;
// route.duration = bestDuration;
//
// return route;
//
// }
//
// private void SetRoutedFlagToFalseForAllNodes() {
// for (int i = 0; i < allNodes.size(); i++) {
// allNodes.get(i).isRouted = false;
// }
// }
private Solution VND(Solution s) {
Solution bestSolution = cloneSolution(s);
boolean terminationCondition = false;
int localSearchIterator = 0;
RelocationMove rm = new RelocationMove();
SwapMove sm = new SwapMove();
TwoOptMove top = new TwoOptMove();
int k = 1;
int kmax = 3;
while (k <= kmax) {
InitializeMoves(rm, sm, top);
FindBestNeighbor(k, s, rm, sm, top);
if (MoveIsImproving(k, rm, sm, top)) {
ApplyMove(k, s, rm, sm, top);
k = 1;
} else {
k = k + 1;
}
}
return bestSolution;
}
private void InitializeMoves(RelocationMove rm, SwapMove sm, TwoOptMove top) {
InitializeTheRelocationMove(rm);
InitializeTheSwapMove(sm);
InitializeTheTwoOptMove(top);
}
private void InitializeTheRelocationMove(RelocationMove rm) {
rm.originNodePosition = -1;
rm.targetNodePosition = -1;
rm.moveCost = Double.MAX_VALUE;
}
private static void InitializeTheSwapMove(SwapMove sm) {
sm.firstNodePosition = -1;
sm.secondNodePosition = -1;
sm.moveCost = Double.MAX_VALUE;
}
private static void InitializeTheTwoOptMove(TwoOptMove top) {
top.positionOfFirstNode = -1;
top.positionOfSecondNode = -1;
top.moveCost = Double.MAX_VALUE;
}
private void findBestTwoOptMove(TwoOptMove top, Solution s) {
for (int i = 0; i < s.routes1500.size(); i++) {
for (int firstIndex = 0; firstIndex < s.routes1500.get(i).nodes.size() - 1; firstIndex++) {
Node A = s.routes1500.get(i).nodes.get(firstIndex);
Node B = s.routes1500.get(i).nodes.get(firstIndex + 1);
for (int secondIndex = firstIndex + 2; secondIndex < s.routes1500.get(i).nodes.size() - 1; secondIndex++) {
Node K = s.routes1500.get(i).nodes.get(secondIndex);
Node L = s.routes1500.get(i).nodes.get(secondIndex + 1);
if (firstIndex == 0 && secondIndex == s.routes1500.get(i).nodes.size() - 2) {
continue;
}
double costAdded = distanceMatrix[A.ID][K.ID] + distanceMatrix[B.ID][L.ID];
double costRemoved = distanceMatrix[A.ID][B.ID] + distanceMatrix[K.ID][L.ID];
double moveCost = costAdded - costRemoved;
if (moveCost < top.moveCost) {
top.moveCost = moveCost;
top.positionOfFirstNode = firstIndex;
top.positionOfSecondNode = secondIndex;
}
}
}
}
for (int j = 0; j < s.routes1200.size(); j++) {
for (int firstIndex = 0; firstIndex < s.routes1200.get(j).nodes.size() - 1; firstIndex++) {
Node A = s.routes1200.get(j).nodes.get(firstIndex);
Node B = s.routes1200.get(j).nodes.get(firstIndex + 1);
for (int secondIndex = firstIndex + 2; secondIndex < s.routes1200.get(j).nodes.size() - 1; secondIndex++) {
Node K = s.routes1200.get(j).nodes.get(secondIndex);
Node L = s.routes1200.get(j).nodes.get(secondIndex + 1);
if (firstIndex == 0 && secondIndex == s.routes1200.get(j).nodes.size() - 2) {
continue;
}
double costAdded = distanceMatrix[A.ID][K.ID] + distanceMatrix[B.ID][L.ID];
double costRemoved = distanceMatrix[A.ID][B.ID] + distanceMatrix[K.ID][L.ID];
double moveCost = costAdded - costRemoved;
if (moveCost < top.moveCost) {
top.moveCost = moveCost;
top.positionOfFirstNode = firstIndex;
top.positionOfSecondNode = secondIndex;
}
}
}
}
for (int i = 0; i < s.allRoutes.size(); i++) {
if (i < 15)
s.allRoutes.add(s.routes1500.get(i));
if (i > 15)
s.allRoutes.add(s.routes1200.get(i - 15));
}
}
private void applyTwoOptMove(TwoOptMove top, Solution s) {
ArrayList modifiedRt = new ArrayList();
double newSolutionCost;
for (int m = 0; m < s.routes1500.size(); m++) {
for (int i = 0; i <= top.positionOfFirstNode; i++) {
modifiedRt.add(s.routes1500.get(m).nodes.get(i));
}
for (int i = top.positionOfSecondNode; i > top.positionOfFirstNode; i--) {
modifiedRt.add(s.routes1500.get(m).nodes.get(i));
}
for (int i = top.positionOfSecondNode + 1; i < s.routes1500.get(m).nodes.size(); i++) {
modifiedRt.add(s.routes1500.get(m).nodes.get(i));
}
s.routes1500.get(m).nodes = modifiedRt;
newSolutionCost = 0;
for (int i = 0; i < s.routes1500.get(m).nodes.size() - 1; i++) {
Node A = s.routes1500.get(m).nodes.get(i);
Node B = s.routes1500.get(m).nodes.get(i + 1);
newSolutionCost = newSolutionCost + distanceMatrix[A.ID][B.ID];
}
if (s.cost + top.moveCost != newSolutionCost) {
System.out.println("Something Went wrong with the cost calculations !!!!");
}
s.routes1500.get(m).cost += top.moveCost;
}
for (int k = 0; k < s.routes1200.size(); k++ ) {
for (int i = 0; i <= top.positionOfFirstNode; i++) {
modifiedRt.add(s.routes1200.get(k).nodes.get(i));
}
for (int i = top.positionOfSecondNode; i > top.positionOfFirstNode; i--) {
modifiedRt.add(s.routes1200.get(k).nodes.get(i));
}
for (int i = top.positionOfSecondNode + 1; i < s.routes1200.get(k).nodes.size(); i++) {
modifiedRt.add(s.routes1200.get(k).nodes.get(i));
}
s.routes1200.get(k).nodes = modifiedRt;
newSolutionCost = 0;
for (int i = 0; i < s.routes1200.get(k).nodes.size() - 1; i++) {
Node A = s.routes1200.get(k).nodes.get(i);
Node B = s.routes1200.get(k).nodes.get(i + 1);
newSolutionCost = newSolutionCost + distanceMatrix[A.ID][B.ID];
}
if (s.cost + top.moveCost != newSolutionCost) {
System.out.println("Something Went wrong with the cost calculations !!!!");
}
s.routes1200.get(k).cost += top.moveCost;
}
for (int i = 0; i < s.allRoutes.size(); i++) {
if (i < 15)
s.allRoutes.add(s.routes1500.get(i));
if (i > 15)
s.allRoutes.add(s.routes1200.get(i - 15));
}
s.cost += top.moveCost;
}
private void FindBestNeighbor(int k, Solution s, RelocationMove rm, SwapMove sm, TwoOptMove top) {
if (k == 1) {
findBestRelocationMove(rm, s);
} else if (k == 2) {
findBestSwapMove(sm, s);
} else if (k == 3) {
findBestTwoOptMove(top, s);
}
}
private boolean MoveIsImproving(int k, RelocationMove rm, SwapMove sm, TwoOptMove top) {
if (k == 1) {
if (rm.moveCost < 0) {
return true;
}
} else if (k == 2) {
if (sm.moveCost < 0) {
return true;
}
} else if (k == 3) {
if (top.moveCost < 0) {
return true;
}
}
return false;
}
private void ApplyMove(int k, Solution s, RelocationMove rm, SwapMove sm, TwoOptMove top) {
if (k == 1) {
applyRelocationMove(rm, s);
} else if (k == 2) {
applySwapMove(sm, s);
}
if (k == 3) {
applyTwoOptMove(top, s);
}
// drawRoutes(s, Double.toString(s.cost));
}
private static Solution cloneSolution(Solution s) {
Solution out = new Solution();
out.cost = s.cost;
for (int i = 0; i < s.routes1500.size(); i++) {
out.routes1500.add(s.routes1500.get(i));
for (int j = 0 ; i < s.routes1500.get(i).nodes.size(); j++) {
Node n = s.routes1500.get(i).nodes.get(j);
out.routes1500.get(i).nodes.add(n);
}
out.routes1500.get(i).cost =s.routes1200.get(i).cost;
}
for (int i = 0; i < s.routes1200.size(); i++) {
out.routes1200.add(s.routes1200.get(i));
for (int j = 0 ; i < s.routes1200.get(i).nodes.size(); j++) {
Node n = s.routes1200.get(i).nodes.get(j);
out.routes1500.get(i).nodes.add(n);
}
out.routes1200.get(i).cost =s.routes1200.get(i).cost;
}
for (int i = 0; i < s.routes1200.size(); i++) {
out.routes1200.add(s.routes1200.get(i));
for (int j = 0 ; i < s.routes1200.get(i).nodes.size(); j++) {
Node n = s.routes1200.get(i).nodes.get(j);
out.routes1500.get(i).nodes.add(n);
}
out.routes1200.get(i).cost =s.routes1200.get(i).cost;
}
for (int i = 0; i < s.allRoutes.size(); i++) {
if (i < 15)
out.allRoutes.add(s.routes1500.get(i));
if (i > 15)
out.allRoutes.add(s.routes1200.get(i - 15));
}
return out;
}
private void ApplyNearestNeighborMethod(Node depot, Solution s) {
for (int m = 0; m < s.routes1500.size(); m++) {
Route route = s.routes1500.get(m);
ArrayList<Node> nodeSequence = route.nodes;
// Initialization
nodeSequence.add(depot);
for (int i = 0; i < customers.size(); i++) {
int positionOfTheNextOne = -1;
double bestCostForTheNextOne = Double.MAX_VALUE;
Node lastInTheRoute = nodeSequence.get(nodeSequence.size() - 1);
for (int j = 0; j < customers.size(); j++) {
Node candidate = customers.get(j);
if (candidate.isRouted == false) {
double trialCost = distanceMatrix[lastInTheRoute.ID][candidate.ID];
if (trialCost < bestCostForTheNextOne) {
positionOfTheNextOne = j;
bestCostForTheNextOne = trialCost;
}
}
}
Node insertedNode = customers.get(positionOfTheNextOne);
nodeSequence.add(insertedNode);
double testCost = distanceMatrix[lastInTheRoute.ID][insertedNode.ID];
if (testCost != bestCostForTheNextOne) {
System.out.println("Something has gone wrong with the cost calculations");
}
s.cost = s.cost + bestCostForTheNextOne;
route.cost = route.cost + bestCostForTheNextOne;
insertedNode.isRouted = true;
}
Node lastInTheRoute = nodeSequence.get(nodeSequence.size() - 1);
nodeSequence.add(depot);
s.routes1500.get(m).cost = s.routes1500.get(m).cost + distanceMatrix[lastInTheRoute.ID][depot.ID];
route.cost = route.cost + distanceMatrix[lastInTheRoute.ID][depot.ID];
}
for (int k = 0; k < s.routes1200.size(); k++) {
Route route = s.routes1200.get(k);
ArrayList<Node> nodeSequence = route.nodes;
// Initialization
nodeSequence.add(depot);
for (int i = 0; i < customers.size(); i++) {
int positionOfTheNextOne = -1;
double bestCostForTheNextOne = Double.MAX_VALUE;
Node lastInTheRoute = nodeSequence.get(nodeSequence.size() - 1);
for (int j = 0; j < customers.size(); j++) {
Node candidate = customers.get(j);
if (candidate.isRouted == false) {
double trialCost = distanceMatrix[lastInTheRoute.ID][candidate.ID];
if (trialCost < bestCostForTheNextOne) {
positionOfTheNextOne = j;
bestCostForTheNextOne = trialCost;
}
}
}
Node insertedNode = customers.get(positionOfTheNextOne);
nodeSequence.add(insertedNode);
double testCost = distanceMatrix[lastInTheRoute.ID][insertedNode.ID];
if (testCost != bestCostForTheNextOne) {
System.out.println("Something has gone wrong with the cost calculations");
}
s.cost = s.cost + bestCostForTheNextOne;
route.cost = route.cost + bestCostForTheNextOne;
insertedNode.isRouted = true;
}
Node lastInTheRoute = nodeSequence.get(nodeSequence.size() - 1);
nodeSequence.add(depot);
s.routes1200.get(k).cost = s.routes1200.get(k).cost + distanceMatrix[lastInTheRoute.ID][depot.ID];
route.cost = route.cost + distanceMatrix[lastInTheRoute.ID][depot.ID];
}
for (int i = 0; i < s.allRoutes.size(); i++) {
if (i < 15)
s.allRoutes.add(s.routes1500.get(i));
if (i > 15)
s.allRoutes.add(s.routes1200.get(i - 15));
}
}
private void findBestRelocationMove(RelocationMove rm, Solution s) {
double bestMoveCost = Double.MAX_VALUE;
for (int i = 0; i < s.routes1500.size(); i++) {
for (int relIndex = 1; relIndex < s.routes1500.get(i).nodes.size() - 1; relIndex++) {
Node A = s.routes1500.get(i).nodes.get(relIndex - 1);
Node B = s.routes1500.get(i).nodes.get(relIndex);
Node C = s.routes1500.get(i).nodes.get(relIndex + 1);
for (int afterInd = 0; afterInd < s.routes1500.get(i).nodes.size() - 1; afterInd++) {
if (afterInd != relIndex && afterInd != relIndex - 1) {
Node F = s.routes1500.get(i).nodes.get(afterInd);
Node G = s.routes1500.get(i).nodes.get(afterInd + 1);
double costRemoved1 = distanceMatrix[A.ID][B.ID] + distanceMatrix[B.ID][C.ID];
double costRemoved2 = distanceMatrix[F.ID][G.ID];
double costRemoved = costRemoved1 + costRemoved2;
double costAdded1 = distanceMatrix[A.ID][C.ID];
double costAdded2 = distanceMatrix[F.ID][B.ID] + distanceMatrix[B.ID][G.ID];
double costAdded = costAdded1 + costAdded2;
double moveCost = costAdded - costRemoved;
if (moveCost < bestMoveCost) {
bestMoveCost = moveCost;
rm.originNodePosition = relIndex;
rm.targetNodePosition = afterInd;
rm.moveCost = moveCost;
}
}
}
}
}
for (int i = 0; i < s.routes1200.size(); i++) {
for (int relIndex = 1; relIndex < s.routes1200.get(i).nodes.size() - 1; relIndex++) {
Node A = s.routes1200.get(i).nodes.get(relIndex - 1);
Node B = s.routes1200.get(i).nodes.get(relIndex);
Node C = s.routes1200.get(i).nodes.get(relIndex + 1);
for (int afterInd = 0; afterInd < s.routes1200.get(i).nodes.size() - 1; afterInd++) {
if (afterInd != relIndex && afterInd != relIndex - 1) {
Node F = s.routes1200.get(i).nodes.get(afterInd);
Node G = s.routes1200.get(i).nodes.get(afterInd + 1);
double costRemoved1 = distanceMatrix[A.ID][B.ID] + distanceMatrix[B.ID][C.ID];
double costRemoved2 = distanceMatrix[F.ID][G.ID];
double costRemoved = costRemoved1 + costRemoved2;
double costAdded1 = distanceMatrix[A.ID][C.ID];
double costAdded2 = distanceMatrix[F.ID][B.ID] + distanceMatrix[B.ID][G.ID];
double costAdded = costAdded1 + costAdded2;
double moveCost = costAdded - costRemoved;
if (moveCost < bestMoveCost) {
bestMoveCost = moveCost;
rm.originNodePosition = relIndex;
rm.targetNodePosition = afterInd;
rm.moveCost = moveCost;
}
}
}
}
}
for (int i = 0; i < s.allRoutes.size(); i++) {
if (i < 15)
s.allRoutes.add(s.routes1500.get(i));
if (i > 15)
s.allRoutes.add(s.routes1200.get(i - 15));
}
}
private void applyRelocationMove(RelocationMove rm, Solution s) {
for (int i = 0; i < s.routes1500.size(); i++ ) {
Node relocatedNode = s.routes1500.get(i).nodes.get(rm.originNodePosition);
s.routes1500.get(i).nodes.remove(rm.originNodePosition);
if (rm.targetNodePosition < rm.originNodePosition) {
s.routes1500.get(i).nodes.add(rm.targetNodePosition + 1, relocatedNode);
}
else {
s.routes1500.get(i).nodes.add(rm.targetNodePosition, relocatedNode);
}
double newSolutionCost = 0;
for (int m = 0; m < s.routes1500.get(i).nodes.size() - 1; m++) {
Node A = s.routes1500.get(m).nodes.get(m);
Node B = s.routes1500.get(m).nodes.get(m + 1);
newSolutionCost = newSolutionCost + distanceMatrix[A.ID][B.ID];
}
if (s.cost + rm.moveCost != newSolutionCost) {
System.out.println("Something Went wrong with the cost calculations !!!!");
}
s.cost = s.cost + rm.moveCost;
s.routes1500.get(i).cost = s.routes1500.get(i).cost + rm.moveCost;
}
for (int j = 0; j < s.routes1200.size(); j++ ) {
Node relocatedNode = s.routes1200.get(j).nodes.get(rm.originNodePosition);
s.routes1200.get(j).nodes.remove(rm.originNodePosition);
if (rm.targetNodePosition < rm.originNodePosition) {
s.routes1200.get(j).nodes.add(rm.targetNodePosition + 1, relocatedNode);
}
else {
s.routes1200.get(j).nodes.add(rm.targetNodePosition, relocatedNode);
}
double newSolutionCost = 0;
for (int i = 0; i < s.routes1200.get(j).nodes.size() - 1; i++) {
Node A = s.routes1200.get(j).nodes.get(i);
Node B = s.routes1200.get(j).nodes.get(i + 1);
newSolutionCost = newSolutionCost + distanceMatrix[A.ID][B.ID];
}
if (s.cost + rm.moveCost != newSolutionCost) {
System.out.println("Something Went wrong with the cost calculations !!!!");
}
s.cost = s.cost + rm.moveCost;
s.routes1200.get(j).cost = s.routes1200.get(j).cost + rm.moveCost;
}
for (int i = 0; i < s.allRoutes.size(); i++) {
if (i < 15)
s.allRoutes.add(s.routes1500.get(i));
if (i > 15)
s.allRoutes.add(s.routes1200.get(i - 15));
}
}
private void findBestSwapMove(SwapMove sm, Solution s) {
double bestMoveCost = Double.MAX_VALUE;
for (int i = 0; i < s.routes1500.size(); i++) {
for (int firstIndex = 1; firstIndex < s.routes1500.get(i).nodes.size() - 1; firstIndex++) {
Node A = s.routes1500.get(i).nodes.get(firstIndex - 1);
Node B = s.routes1500.get(i).nodes.get(firstIndex);
Node C = s.routes1500.get(i).nodes.get(firstIndex + 1);
for (int secondInd = firstIndex + 1; secondInd < s.routes1500.get(i).nodes.size() - 1; secondInd++) {
Node D = s.routes1500.get(i).nodes.get(secondInd - 1);
Node E = s.routes1500.get(i).nodes.get(secondInd);
Node F = s.routes1500.get(i).nodes.get(secondInd + 1);
double costRemoved = 0;
double costAdded = 0;
if (secondInd == firstIndex + 1) {
costRemoved = distanceMatrix[A.ID][B.ID] + distanceMatrix[B.ID][C.ID] + distanceMatrix[C.ID][F.ID];
costAdded = distanceMatrix[A.ID][C.ID] + distanceMatrix[C.ID][B.ID] + distanceMatrix[B.ID][F.ID];
} else {
double costRemoved1 = distanceMatrix[A.ID][B.ID] + distanceMatrix[B.ID][C.ID];
double costRemoved2 = distanceMatrix[D.ID][E.ID] + distanceMatrix[E.ID][F.ID];
costRemoved = costRemoved1 + costRemoved2;
double costAdded1 = distanceMatrix[A.ID][E.ID] + distanceMatrix[E.ID][C.ID];
double costAdded2 = distanceMatrix[D.ID][B.ID] + distanceMatrix[B.ID][F.ID];
costAdded = costAdded1 + costAdded2;
}
double moveCost = costAdded - costRemoved;
if (moveCost < bestMoveCost) {
bestMoveCost = moveCost;
sm.firstNodePosition = firstIndex;
sm.secondNodePosition = secondInd;
sm.moveCost = moveCost;
}
}
}
}
for (int i = 0; i < s.routes1200.size(); i++) {
for (int firstIndex = 1; firstIndex < s.routes1200.get(i).nodes.size() - 1; firstIndex++) {
Node A = s.routes1200.get(i).nodes.get(firstIndex - 1);
Node B = s.routes1200.get(i).nodes.get(firstIndex);
Node C = s.routes1200.get(i).nodes.get(firstIndex + 1);
for (int secondInd = firstIndex + 1; secondInd < s.routes1200.get(i).nodes.size() - 1; secondInd++) {
Node D = s.routes1200.get(i).nodes.get(secondInd - 1);
Node E = s.routes1200.get(i).nodes.get(secondInd);
Node F = s.routes1200.get(i).nodes.get(secondInd + 1);
double costRemoved = 0;
double costAdded = 0;
if (secondInd == firstIndex + 1) {
costRemoved = distanceMatrix[A.ID][B.ID] + distanceMatrix[B.ID][C.ID] + distanceMatrix[C.ID][F.ID];
costAdded = distanceMatrix[A.ID][C.ID] + distanceMatrix[C.ID][B.ID] + distanceMatrix[B.ID][F.ID];
} else {
double costRemoved1 = distanceMatrix[A.ID][B.ID] + distanceMatrix[B.ID][C.ID];
double costRemoved2 = distanceMatrix[D.ID][E.ID] + distanceMatrix[E.ID][F.ID];
costRemoved = costRemoved1 + costRemoved2;
double costAdded1 = distanceMatrix[A.ID][E.ID] + distanceMatrix[E.ID][C.ID];
double costAdded2 = distanceMatrix[D.ID][B.ID] + distanceMatrix[B.ID][F.ID];
costAdded = costAdded1 + costAdded2;
}
double moveCost = costAdded - costRemoved;
if (moveCost < bestMoveCost) {
bestMoveCost = moveCost;
sm.firstNodePosition = firstIndex;
sm.secondNodePosition = secondInd;
sm.moveCost = moveCost;
}
}
}
}
for (int i = 0; i < s.allRoutes.size(); i++) {
if (i < 15)
s.allRoutes.add(s.routes1500.get(i));
if (i > 15)
s.allRoutes.add(s.routes1200.get(i - 15));