private static LinkedList<Coords> polarSort(LinkedList<Coords> list) {
// find point with lowest x-coord
int i = 0;
double lowest = 9999999999.0;
int lowIndex = 0;
Coords tmp;
while (i < list.size()) {
tmp = list.get(i);
if (tmp.getX() < lowest) {
lowest = tmp.getX();
lowIndex = i;
} else if (tmp.getX() == lowest) {
if (tmp.getY() < list.get(lowIndex).getY()) {
lowIndex = i;
}
}
i++;
}
Coords lowestCoord = list.remove(lowIndex);
LinkedList<Coords> sorted = new LinkedList<Coords>();
sorted.add(list.poll());
while (list.size() > 0) {
tmp = list.poll();
i = sorted.size();
while (i > 0 && compVect(lowestCoord, sorted.get(i - 1), tmp) < 0.0) {
i--;
}
sorted.add(i, tmp);
}
sorted.add(0, lowestCoord);
return sorted;
}
public static int[] bfs(int s, int e, int[][] f) {
int[] prev = new int[f.length];
Arrays.fill(prev, -1);
LinkedList<Integer> q = new LinkedList<Integer>();
q.add(s);
while (q.size() > 0) {
int at = q.poll();
for (int i = 0; i < f.length; i++) {
if (prev[i] != -1 || i == at) continue;
if (f[at][i] > 0) {
prev[i] = at;
if (i == e) return prev;
q.addLast(i);
}
}
}
return null;
}
/*
* Finds the number of routes from a specified start node to a specified end node.
* Restrictions include max, distance, and lessthan.
*/
private static void findNumberofRoutes(String inputString) {
int routes = 0;
int counter1 = 0;
int counter2 = 0;
int depth = 0;
String restriction = inputString.substring(input.indexOf(":") + 1, input.indexOf("="));
String restrictionValueString = inputString.substring(input.indexOf("=") + 2);
int restrictionValue = Integer.parseInt(restrictionValueString);
LinkedList<Edge> bfs = new LinkedList<Edge>();
Stack<Edge> dfs = new Stack<Edge>();
Stack<Integer> dfslength = new Stack<Integer>();
Edge current;
int currentLength;
first = inputString.charAt(0);
second = inputString.charAt(2);
if (restriction.equals("max")) {
edgeList = nodeMap.get(first).getEdges();
for (i = 0; i < edgeList.size(); i++) {
bfs.add(edgeList.get(i));
counter2++;
}
while (depth < restrictionValue) {
counter1 = counter2;
counter2 = 0;
for (i = 0; i < counter1; i++) {
current = bfs.poll();
if (current != null && current.getEdgeDestination() == second) {
routes++;
}
edgeList = nodeMap.get(current.getEdgeDestination()).getEdges();
for (j = 0; j < edgeList.size(); j++) {
bfs.add(edgeList.get(j));
counter2++;
}
}
depth++;
}
} else if (restriction.equals("distance")) {
edgeList = nodeMap.get(first).getEdges();
for (i = 0; i < edgeList.size(); i++) {
bfs.add(edgeList.get(i));
counter2++;
}
while (depth <= restrictionValue) {
counter1 = counter2;
counter2 = 0;
for (i = 0; i < counter1; i++) {
current = bfs.poll();
if (current != null
&& current.getEdgeDestination() == second
&& depth == restrictionValue) {
routes++;
}
edgeList = nodeMap.get(current.getEdgeDestination()).getEdges();
for (j = 0; j < edgeList.size(); j++) {
bfs.add(edgeList.get(j));
counter2++;
}
}
depth++;
}
} else if (restriction.equals("lessthan")) {
edgeList = nodeMap.get(first).getEdges();
for (i = 0; i < edgeList.size(); i++) {
if (edgeList.get(i).getEdgeLength() < restrictionValue) {
dfs.push(edgeList.get(i));
dfslength.push(edgeList.get(i).getEdgeLength());
}
}
while (!dfs.empty()) {
current = dfs.pop();
currentLength = dfslength.pop();
edgeList = nodeMap.get(current.getEdgeDestination()).getEdges();
for (i = 0; i < edgeList.size(); i++) {
if (currentLength + edgeList.get(i).getEdgeLength() < restrictionValue) {
if (edgeList.get(i).getEdgeDestination() == second) {
routes++;
}
dfs.push(edgeList.get(i));
dfslength.push(edgeList.get(i).getEdgeLength() + currentLength);
}
}
}
}
try {
bw.write(Integer.toString(routes));
bw.newLine();
} catch (IOException e) {
System.out.println(e);
}
}