Complete the function in the editor below. It received 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.
Question
Complete the function in the editor below. It received 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.
Solution
To complete the function, we need to perform a postorder traversal of the binary tree and print the values in a single line, separated by spaces.
Here is the step-by-step solution:
- Define the function with the given parameter, which is a pointer to the root of the binary tree.
- Check if the root is null. If it is, return from the function.
- Recursively call the function on the left subtree of the root.
- Recursively call the function on the right subtree of the root.
- Print the value of the root.
- Combine the values obtained from the left and right subtrees, along with the root value, and print them in a single line, separated by spaces.
Here is the code implementation in Python:
def postorderTraversal(root):
if root is None:
return
# Step 3: Recursively call the function on the left subtree
postorderTraversal(root.left)
# Step 4: Recursively call the function on the right subtree
postorderTraversal(root.right)
# Step 5: Print the value of the root
print(root.value, end=" ")
This function can be called with the root of the binary tree to print the values in postorder traversal.
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