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 C (judge verdict: Accepted)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int depth[100000];

struct node {
  int parent, child, sibling;
};
struct node tree[100000];

void showInfo(int id) {
  char type[20];
  if(tree[id].parent == -1)
    strcpy(type, "root");
  else if(tree[id].child != -1)
    strcpy(type, "internal node");
  else
    strcpy(type, "leaf");

  printf("node %d: parent = %d, depth = %d, %s, ", id, tree[id].parent, depth[id], type);

  printf("[");
  if(tree[id].child != -1) {
    id = tree[id].child;
    while(tree[id].sibling != -1) {
      printf("%d, ", id);
      id = tree[id].sibling;
    }
    printf("%d", id);
  }
  printf("]\n");
}

void setDepth(int id, int d) {
  depth[id] = d;
  if(tree[id].child != -1)
    setDepth(tree[id].child, d + 1);
  if(tree[id].sibling != -1)
    setDepth(tree[id].sibling, d);
  if(tree[id].child == -1)
    return;
}

int main() {
  int i, j, n, id, k, root, c[100000];

  scanf("%d", &n);
  for(i = 0;i < n;i++) {
    tree[i].sibling = -1;
    tree[i].parent = -1;
    tree[i].child = -1;
  }

  for(i = 0;i < n;i++) {
    scanf("%d", &id);
    scanf("%d", &k);
    if(k != 0) {
      for(j = 0;j < k;j++) {
        scanf("%d", &c[j]);
        tree[c[j]].parent = id;
        if(j > 0)
          tree[c[j - 1]].sibling = c[j];
      }
      tree[id].child = c[0];
    }
  }

  for(i = 0;i < n;i++)
    if(tree[i].parent == -1)
      root = i;

  setDepth(root, 0);

  for(i = 0;i < n;i++)
    showInfo(i);

  return 0;
}