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  1. Practice
  2. Data Structures
  3. Trees
  4. Tree : Top View

Tree : Top View

Given a pointer to the root of a binary tree, print the top view of the binary tree.

The tree as seen from the top the nodes, is called the top view of the tree.

For example :

   1
    \
     2
      \
       5
      /  \
     3    6
      \
       4

Top View :

Complete the function and print the resulting values on a single line separated by space.

Input Format

You are given a function,

void topView(node * root) {

}

Constraints

Nodes in the tree

Output Format

Print the values on a single line separated by space.

Sample Input

   1
    \
     2
      \
       5
      /  \
     3    6
      \
       4

Sample Output

1 2 5 6

Explanation

   1
    \
     2
      \
       5
      /  \
     3    6
      \
       4

From the top, only nodes are visible.