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 <string.h>

#define N 131072

typedef struct {
  int parent;
  int child;
  int sibling;
  int depth;
} node_t;

void dfs(node_t *array, int id, int d) {
  int child;

  if (id == -1)
    return;
  array[id].depth = d;
  for (child = array[id].child; child != -1; child = array[child].sibling)
    dfs(array, child, d+1);
}

int main(void) {
  int i, j, n, left, pid, cid, k;
  char *type;
  node_t array[N];
  memset(array, -1, sizeof(array));

  scanf("%d", &n);
  for (i = 0; i < n; i++) {
    scanf("%d", &pid);
    scanf("%d", &k);
    for (j = 0; j < k; j++) {
      scanf("%d", &cid);
      array[cid].parent = pid;
      if (!j)
	array[pid].child = cid;
      else
	array[left].sibling = cid;
      left = cid;
    }
  }

  // calulate depths
  for (i = 0; i < n; i++) {
    if (array[i].parent == -1) {
      dfs(array, i, 0);
      break;
    }
  }
  
  for (i = 0; i < n; i++) {
    // determination a node type
    if (array[i].parent == -1)
      type = "root";
    else if (array[i].child == -1)
      type = "leaf";
    else
      type = "internal node";
    
    printf("node %d: parent = %d, depth = %d, %s, ["
  	   , i, array[i].parent, array[i].depth, type);

    // print child nodes
    int id = i;
    for (k = 0; id != -1; k++) {
      if (!k && array[id].child != -1) {
	printf("%d", array[id].child);
	id = array[id].child;
      }
      else if (k && array[id].sibling != -1){
   	printf(", ");
      	printf("%d", array[id].sibling);
	id = array[id].sibling;
      }
      else
	break;
    }
    printf("]\n");
  }

  return 0;
}