public static ArrayList<String> serializeTree(TreeNode tree) {
ArrayList<String> res = new ArrayList<>();
LinkedList<TreeNode> queue = new LinkedList<>();
queue.addLast(tree);
while (!queue.isEmpty()) {
TreeNode node = queue.removeFirst();
if (node == null) {
res.add(NULL);
} else {
res.add(String.valueOf(node.val));
queue.add(node.left);
queue.add(node.right);
}
}
while (res.size() > 1 && res.get(res.size() - 1).equals(NULL)) {
res.remove(res.size() - 1);
}
return res;
}
public void solve() {
int m = in.nextInt();
int n = in.nextInt();
int[][] a = new int[n][m];
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
a[i][j] = in.nextInt();
}
}
Set<Point> visited = new HashSet<Point>();
List<Set<Point>> rooms = new ArrayList<Set<Point>>();
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
Point cur = new Point(i, j);
if (!visited.contains(cur)) {
Set<Point> connected = new HashSet<Point>();
LinkedList<Point> list = new LinkedList<Point>();
list.addLast(cur);
while (!list.isEmpty()) {
Point head = list.removeFirst();
debug(head);
if (!visited.contains(head)) {
visited.add(head);
connected.add(head);
if ((a[head.x][head.y] & 1) == 0) {
list.addLast(new Point(head.x, head.y - 1));
}
if ((a[head.x][head.y] & 1 << 1) == 0) {
list.addLast(new Point(head.x - 1, head.y));
}
if ((a[head.x][head.y] & 1 << 2) == 0) {
list.addLast(new Point(head.x, head.y + 1));
}
if ((a[head.x][head.y] & 1 << 3) == 0) {
list.addLast(new Point(head.x + 1, head.y));
}
debug(visited);
}
}
rooms.add(connected);
}
}
}
out.println(rooms.size());
int[][] count = new int[n][m];
int maxRooms = 0;
Map<Point, Integer> map = new HashMap<Point, Integer>();
int hashCount = 0;
for (Set<Point> room : rooms) {
maxRooms = max(maxRooms, room.size());
for (Point x : room) {
count[x.x][x.y] = room.size();
map.put(x, hashCount);
}
hashCount++;
}
out.println(maxRooms);
int maxConnected = 0;
int resX = 0, resY = 0;
char resD = ' ';
for (int j = 0; j < m; j++) {
for (int i = n - 1; i >= 0; i--) {
if (i > 0
&& ((a[i][j] & 1 << 1) != 0)
&& !map.get(new Point(i, j)).equals(map.get(new Point(i - 1, j)))
&& count[i][j] + count[i - 1][j] > maxConnected) {
maxConnected = count[i][j] + count[i - 1][j];
resX = i;
resY = j;
resD = 'N';
}
if (j < m - 1
&& ((a[i][j] & 1 << 2) != 0)
&& !map.get(new Point(i, j)).equals(map.get(new Point(i, j + 1)))
&& count[i][j] + count[i][j + 1] > maxConnected) {
maxConnected = count[i][j] + count[i][j + 1];
resX = i;
resY = j;
resD = 'E';
}
}
}
out.println(maxConnected);
out.printf("%d %d %c\n", resX + 1, resY + 1, resD);
debug(count);
}