Problem:
Rooted Trees

A graph G = (V, E) is a data structure where V is a finite set of vertices and E is a binary relation on V represented by a set of edges. Fig. 1 illustrates an example of a graph (or graphs).

Fig. 1

A free tree is a connnected, acyclic, undirected graph. A rooted tree is a free tree in which one of the vertices is distinguished from the others. A vertex of a rooted tree is called "node."

Your task is to write a program which reports the following information for each node u of a given rooted tree T:

node ID of u

parent of u

depth of u

node type (root, internal node or leaf)

a list of chidlren of u

If the last edge on the path from the root r of a tree T to a node x is (p, x), then p is the parent of x, and x is a child of p. The root is the only node in T with no parent.

A node with no children is an external node or leaf. A nonleaf node is an internal node

The number of children of a node x in a rooted tree T is called the degree of x.

The length of the path from the root r to a node x is the depth of x in T.

Here, the given tree consists of n nodes and evey node has a unique ID from 0 to n-1.

Fig. 2 shows an example of rooted trees where ID of each node is indicated by a number in a circle (node). The example corresponds to the first sample input.

Fig. 2

Input

The first line of the input includes an integer n, the number of nodes of the tree.

In the next n lines, the information of each node u is given in the following format:

id k c1 c2 ... ck

where id is the node ID of u, k is the degree of u, c1 ... ck are node IDs of 1st, ... kth child of u. If the node does not have a child, the k is 0.

Output

Print the information of each node in the following format ordered by IDs:

node id: parent = p, depth = d, type, [c1...ck]

p is ID of its parent. If the node does not have a parent, print -1.

d is depth of the node.

type is a type of nodes represented by a string (root, internal node or leaf). If the root can be considered as a leaf or an internal node, print root.

c1...ck is the list of children as a ordered tree.

Please follow the format presented in a sample output below.

Constraints

1 ≤ n ≤ 100000

Sample Input 1

13
0 3 1 4 10
1 2 2 3
2 0
3 0
4 3 5 6 7
5 0
6 0
7 2 8 9
8 0
9 0
10 2 11 12
11 0
12 0

Sample Output 1

node 0: parent = -1, depth = 0, root, [1, 4, 10]
node 1: parent = 0, depth = 1, internal node, [2, 3]
node 2: parent = 1, depth = 2, leaf, []
node 3: parent = 1, depth = 2, leaf, []
node 4: parent = 0, depth = 1, internal node, [5, 6, 7]
node 5: parent = 4, depth = 2, leaf, []
node 6: parent = 4, depth = 2, leaf, []
node 7: parent = 4, depth = 2, internal node, [8, 9]
node 8: parent = 7, depth = 3, leaf, []
node 9: parent = 7, depth = 3, leaf, []
node 10: parent = 0, depth = 1, internal node, [11, 12]
node 11: parent = 10, depth = 2, leaf, []
node 12: parent = 10, depth = 2, leaf, []

Sample Input 2

4
1 3 3 2 0
0 0
3 0
2 0

Sample Output 2

node 0: parent = 1, depth = 1, leaf, []
node 1: parent = -1, depth = 0, root, [3, 2, 0]
node 2: parent = 1, depth = 1, leaf, []
node 3: parent = 1, depth = 1, leaf, []

Note

You can use a left-child, right-sibling representation to implement a tree which has the following data:

the parent of u

the leftmost child of u

the immediate right sibling of u

Reference

Introduction to Algorithms, Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, and Clifford Stein. The MIT Press.

Solution in Scala (judge verdict: Memory Limit Exceeded)

import scala.io.{StdIn, Source}

class Node {
  var id = 0
  var parent: Node    = null
  var leftChild: Node = null
  var rightSib: Node  = null

  def depth(): Int = parent match {
    case null => 0
    case _    => 1 + parent.depth
  }

  def parentId() = parent match {
    case null => -1
    case _    => parent.id
  }

  def childIds(): List[Int] = leftChild match {
    case null => Nil
    case _    => leftChild.id :: leftChild.rightSibIds
  }

  def rightSibIds(): List[Int] = rightSib match {
    case null => Nil
    case _    => rightSib.id :: rightSib.rightSibIds
  }

  def typeName(): String = {
    if (parent == null) return "root"
    if (childIds.isEmpty) return "leaf"
    return "internal node"
  }
}

object Main {
  def main(args: Array[String]) {
    val nNodes = StdIn.readInt
    val tree   = new Array[Node](nNodes).map {_ => new Node}
    
    1 to nNodes foreach {_ =>
      val inputs   = StdIn.readLine.split(" ").map { _.toInt }
      val id       = inputs.head
      val childIds = inputs.tail.tail

      val node = tree(id)
      node.id = id
      if (! childIds.isEmpty) {
        node.leftChild = tree( childIds(0) )
        for ( (childId, i) <- childIds.view.zipWithIndex) {
          val child    = tree(childId)
          child.parent = tree(id)
          if (i < childIds.size - 1) {
            child.rightSib = tree( childIds(i + 1) )
          }
        }
      }
    }

    tree.foreach {n =>
      val info = s"node ${n.id}: parent = ${n.parentId}, " +
        s"depth = ${n.depth}, ${n.typeName}, [${n.childIds.mkString(", ")}]"
        println(info)
    }
  }
}