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  1. Practice
  2. Data Structures
  3. Trees
  4. Tree: Postorder Traversal

Tree: Postorder Traversal

Complete the function in your editor below, which has parameter: a pointer to the root of a binary tree. It must print the values in the tree's postorder traversal as a single line of space-separated values.

Input Format

Our hidden tester code passes the root node of a binary tree to your function.

Constraints

Nodes in the tree

Output Format

Print the tree's postorder traversal as a single line of space-separated values.

Sample Input

     1
      \
       2
        \
         5
        /  \
       3    6
        \
         4

Sample Output

4 3 6 5 2 1

Explanation

The required result of the post-order traversal of the given binary tree is as above.