# What is the time complexity of post-order traversal?

## What is the time complexity of post-order traversal?

Given a Binary Tree, the task is to print the elements in post order using O(N) time complexity and constant space.

**What is the time complexity of traversing a tree?**

The time complexity of traversing a binary tree is O(V+E) where V is the number of vertices(nodes) and E is the number of edges. Since in a binary tree, edges are V-1, the overall time complexity can be written as O(2*V – 1) or O(V).

### What are the time complexity of level order traversal respectively?

6. What is the time complexity of level order traversal? Explanation: Since you have to go through all the nodes, the complexity becomes O(n). 7.

**What is the post-order traversal of the given tree?**

The post order traversal technique follows the Left Right Root policy. Here, Left Right Root means the left subtree of the root node is traversed first, then the right subtree, and finally, the root node is traversed. Here, the Postorder name itself suggests that the tree’s root node would be traversed at last.

## Is post-order traversal sorted?

Unlike in-order traversal, which prints all nodes of the binary search tree in sorted order, post-order doesn’t provide sorting but it is frequently used while deleting nodes from the binary tree, see a good book or online course on data structure and algorithms like Data Structures and Algorithms: Deep Dive Using Java …

**What is the space complexity of the post order traversal in the recursive fashion?**

Discussion Forum

Que. | What is the space complexity of the post-order traversal in the recursive fashion? (d is the tree depth and n is the number of nodes) |
---|---|

b. | O(nlogd) |

c. | O(logd) |

d. | O(d) |

Answer:O(d) |

### What is the space complexity of the Postorder traversal in the recursive fashion?

Bookmark this question. Show activity on this post. So I know that the space complexity of a recursive in order traversal is O(h) and not O(n) as h = tree height and n = number of nodes in the tree. We are pushing n memory addresses to the call stack, therefore, the space complexity should be O(n).

**What is true about Postorder traversal of tree?**

Explanation: In postorder traversal the left subtree is traversed first and then the right subtree and then the current node. So, the posturer traversal of the tree is, S W T Q X U V R P.

## What is Postorder traversal of above tree?

**Where is the Postorder traversal of a tree?**

All keys before the root node in the inorder sequence become part of the left subtree, and all keys after the root node become part of the right subtree. If we repeat this recursively for all tree nodes, we will end up doing a postorder traversal on the tree.