static void sweep(ArrayList<Integer> indexes) {
PriorityQueue<Event> pq = new PriorityQueue<Event>();
for (int i = 0; i < indexes.size(); i++) {
pq.offer(new Event(lo[val[indexes.get(i)]] + 1, 1, indexes.get(i)));
pq.offer(new Event(hi[val[indexes.get(i)]], -1, indexes.get(i)));
}
TreeSet<Integer> active = new TreeSet<Integer>();
while (!pq.isEmpty()) {
Event curr = pq.poll();
if (curr.type == 1) active.add(curr.index);
else if (curr.type == -1) {
active.remove(curr.index);
Integer lower = active.lower(curr.index);
if (lower != null && lower > lo[val[curr.index]]) {
Interval add = new Interval(lower, curr.index);
Interval prev = intervals.floor(add);
Interval next = intervals.ceiling(add);
boolean intersectPrev = true;
boolean intersectNext = true;
if (prev != null) {
if (Math.max(add.l, prev.l) < Math.min(add.r, prev.r)) {
if (add.r - add.l <= prev.r - prev.l) {
intervals.remove(prev);
intersectPrev = false;
}
} else {
intersectPrev = false;
}
} else {
intersectPrev = false;
}
if (next != null) {
if (Math.max(add.l, next.l) < Math.min(add.r, next.r)) {
if (add.r - add.l <= next.r - next.l) {
intervals.remove(next);
intersectNext = false;
}
} else {
intersectNext = false;
}
} else {
intersectNext = false;
}
if (!intersectPrev && !intersectNext) intervals.add(add);
}
}
}
}
static void solve(Scanner sc) throws IOException {
int h = sc.nextInt();
int w = sc.nextInt();
int k = sc.nextInt();
PriorityQueue<Node> pq = new PriorityQueue<Node>();
for (int i = 0; i < h; i++) {
String s = sc.next();
for (int j = 0; j < w; j++) {
grid[i][j] = s.charAt(j);
dis[i][j] = grid[i][j] == '#' ? 0 : inf;
if (grid[i][j] == 'S') pq.offer(new Node(i, j, 0));
}
}
// Dijkstra
// There is always a solution according to problem statement
while (!pq.isEmpty()) {
Node z = pq.poll();
int x = z.x;
int y = z.y;
int d = z.dis;
if (d > dis[x][y]) continue;
if (x == 0 || x == h - 1 || y == 0 || y == w - 1) {
System.out.println(d + 1);
break;
}
for (int i = 0; i < 4; i++) {
int nx = x + dx[i];
int ny = y + dy[i];
// if(nx<0||nx>=h||ny<0||ny>=w)
// continue;
int nd = d + 1 + (grid[nx][ny] == '@' ? k : 0);
if (nd < dis[nx][ny]) {
dis[nx][ny] = nd;
pq.offer(new Node(nx, ny, nd));
}
}
}
}
// 保存待访问的URL及其优先级
private static void SavePriorQueue(String filepath) throws Exception {
BufferedWriter bw = new BufferedWriter(new FileWriter(filepath));
PriorityQueue<UrlValue> temp = new PriorityQueue<UrlValue>();
UrlValue cur = null;
while (pq.peek() != null) {
cur = pq.remove();
temp.offer(cur);
bw.write(cur.url + " " + cur.value);
bw.newLine();
}
pq = temp;
bw.flush();
bw.close();
}
// 清除所有优先队列的数据，设置优先种子
private static void SetSeeds(String filepath) throws Exception {
pq.clear();
BufferedReader br = new BufferedReader(new FileReader(filepath));
String line = null;
UrlValue cur = null;
visitedPrint();
while ((line = br.readLine()) != null) {
line = line.trim();
// System.out.println(line);
if (!line.equals("")) {
if (!visitedUrl.contains(line)) {
cur = new UrlValue();
cur.url = line;
cur.value = 1;
pq.offer(cur);
} else {
System.out.println("contain");
}
}
}
br.close();
}
// 加载待访问的url
private static void SetPriorQueue(String filePath) throws Exception {
BufferedReader br = new BufferedReader(new FileReader(filePath));
Scanner sc = null;
String line = null;
String url = null;
UrlValue cur = null;
while ((line = br.readLine()) != null) {
line = line.trim();
if (!line.equals("")) {
sc = new Scanner(line);
url = sc.next();
if (!visitedUrl.contains(url)) {
cur = new UrlValue();
cur.url = url;
cur.value = sc.nextDouble();
pq.offer(cur);
}
}
}
br.close();
}
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new FileReader(new File(args[0])));
BufferedWriter bw = new BufferedWriter(new FileWriter(args[1]));
int T = Integer.parseInt(br.readLine());
for (int t = 1; t <= T; t++) {
br.readLine();
List<List<Station>> graph = new ArrayList<>();
int N = Integer.parseInt(br.readLine());
for (int i = 0; i < N; i++) {
graph.add(new ArrayList<>());
String[] line1 = br.readLine().split(" ");
int SN = Integer.parseInt(line1[0]);
int W = Integer.parseInt(line1[1]);
for (int j = 0; j < SN; j++) {
graph.get(i).add(new Station(i, j, W));
}
String[] dist = br.readLine().split(" ");
for (int j = 0; j < dist.length; j++) {
int d = Integer.parseInt(dist[j]);
Station s1 = graph.get(i).get(j);
Station s2 = graph.get(i).get(j + 1);
s1.neighbors.put(s2, d);
s2.neighbors.put(s1, d);
}
}
int tunnelNum = Integer.parseInt(br.readLine());
for (int i = 0; i < tunnelNum; i++) {
String[] tunnel = br.readLine().split(" ");
int l1 = Integer.parseInt(tunnel[0]) - 1;
int s1 = Integer.parseInt(tunnel[1]) - 1;
int l2 = Integer.parseInt(tunnel[2]) - 1;
int s2 = Integer.parseInt(tunnel[3]) - 1;
int d = Integer.parseInt(tunnel[4]);
Station sta1 = graph.get(l1).get(s1);
Station sta2 = graph.get(l2).get(s2);
sta1.neighbors.put(sta2, d + sta2.waitTime); // add wait time to distance
sta2.neighbors.put(sta1, d + sta1.waitTime);
Station sta11 = sta1.cloneForTunnel();
Station sta22 = sta2.cloneForTunnel();
graph.get(sta1.lineNo).add(sta11);
graph.get(sta2.lineNo).add(sta22);
for (Station st : sta11.neighbors.keySet()) {
sta2.neighbors.put(
st,
d
+ sta11.neighbors.get(
st)); // don't wait, sta11 means go xsfrom sta2 to sta1 than go to other
// tunnel
}
for (Station st : sta22.neighbors.keySet()) {
sta1.neighbors.put(st, d + sta22.neighbors.get(st));
}
}
int queryNum = Integer.parseInt(br.readLine());
bw.write("Case: #" + t + ":");
bw.newLine();
for (int i = 0; i < queryNum; i++) {
String[] query = br.readLine().split(" ");
int l1 = Integer.parseInt(query[0]) - 1;
int s1 = Integer.parseInt(query[1]) - 1;
int l2 = Integer.parseInt(query[2]) - 1;
int s2 = Integer.parseInt(query[3]) - 1;
Station sta1 = graph.get(l1).get(s1);
Station sta2 = graph.get(l2).get(s2);
PriorityQueue<Station> pq = new PriorityQueue<>();
sta1.dist = sta1.waitTime;
for (List<Station> line : graph) {
for (Station st : line) {
pq.offer(st);
}
}
Set<Station> visited = new HashSet<>();
visited.add(sta1);
boolean done = false;
while (!done && !pq.isEmpty()) {
Station st = pq.poll();
for (Station neb : st.neighbors.keySet()) {
if (!visited.contains(neb)) {
neb.dist = st.dist + st.neighbors.get(neb);
if (neb == sta2) { // reference to same object
done = true;
break;
}
visited.add(neb);
pq.remove(neb); // because need to let pq update this item's priority level
pq.offer(neb);
}
}
}
int ret = sta2.dist == Integer.MAX_VALUE ? -1 : sta2.dist;
bw.write("" + ret);
bw.newLine();
}
}
bw.close();
br.close();
}
public static void main(String[] args) throws Exception {
int V, E, s, u, v, w;
/* // Graph in Figure 4.17
5 7 2
2 1 2
2 3 7
2 0 6
1 3 3
1 4 6
3 4 5
0 4 1
*/
Scanner sc = new Scanner(System.in);
V = sc.nextInt();
E = sc.nextInt();
s = sc.nextInt();
AdjList.clear();
for (int i = 0; i < V; i++) {
ArrayList<IntegerPair> Neighbor = new ArrayList<IntegerPair>();
AdjList.add(Neighbor); // add neighbor list to Adjacency List
}
for (int i = 0; i < E; i++) {
u = sc.nextInt();
v = sc.nextInt();
w = sc.nextInt();
AdjList.get(u).add(new IntegerPair(v, w)); // first time using weight
}
// Dijkstra routine
ArrayList<Integer> dist = new ArrayList<>();
// INF = 1*10^9 not MAX_INT to avoid overflow
dist.addAll(Collections.nCopies(V, INF));
dist.set(s, 0);
PriorityQueue<IntegerPair> pq =
new PriorityQueue<IntegerPair>(
1,
new Comparator<IntegerPair>() { // overriding the compare method
public int compare(IntegerPair i, IntegerPair j) {
return i.dfs - j.dfs;
}
});
pq.offer(new IntegerPair(s, 0)); // sort based on increasing distance
while (!pq.isEmpty()) { // main loop
IntegerPair top = pq.poll(); // greedy: pick shortest unvisited vertex
int d = top.dfs;
u = top.vn;
if (d > dist.get(u)) continue; // We want to process vertex u only once!
Iterator it = AdjList.get(u).iterator();
while (it.hasNext()) { // all outgoing edges from u
IntegerPair p = (IntegerPair) it.next();
v = p.vn;
int weight_u_v = p.dfs;
if (dist.get(u) + weight_u_v < dist.get(v)) { // if can relax
// (note: Record SP spanning tree here if needed. This is similar)
dist.set(v, dist.get(u) + weight_u_v); // relax
pq.offer(new IntegerPair(v, dist.get(v))); // (as printpath in BFS)
// enqueue this neighbor regardless whether it is already in pq or not
}
}
}
for (int i = 0; i < V; i++) // index + 1 for final answer
System.out.printf("SSSP(%d, %d) = %d\n", s, i, dist.get(i));
}
public static void add(UrlValue url) {
if (url != null && !url.url.trim().equals("") && !visitedUrl.contains(url.url)) {
url.url = url.url.trim();
pq.offer(url);
}
}