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  1. Prepare
  2. Data Structures
  3. Trees
  4. Tree: Preorder Traversal

Tree: Preorder Traversal

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

Input Format

Our test code passes the root node of a binary tree to the preOrder function.

Constraints

Nodes in the tree

Output Format

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

Sample Input

     1
      \
       2
        \
         5
        /  \
       3    6
        \
         4

Sample Output

1 2 5 3 4 6

Explanation

The preorder traversal of the binary tree is printed.