Question

Which of the following tree traversal visits root node last?
1) inorder
2) preorder
3) postorder
4) None of the above

Answer 1

Option 3.

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Answer 2

In post-order tree traversal, the root node is visited last. (option 3)

• The binary tree is the non-linear type data structure where the data items are not organized sequentially.

• Hence, we can't traverse a binary tree, like we traverse a linked list or arrays where the data are organized sequentially, but it requires a different approach.

• The traversal of the binary tree simply involves visiting each node of the tree exactly once.

• There are commonly three methods that are used for traversal of binary trees i.e. In-order traversal, pre-order traversal, post-order traversal.

• For traversing a non-empty binary tree in post order, we need to perform a particular three operations in the following order:

1. Traverse or visit the left sub-tree in post-order.
2. Traverse or visit the right sub-tree in post-order.
3. Root node is visited last.