## How do you find the subtree sum?

Approach : Do post order traversal of the binary tree. At every node, find left subtree value and right subtree value recursively. The value of subtree rooted at current node is equal to sum of current node value, left node subtree sum and right node subtree sum.

## How do you validate a binary search tree?

To see if a binary tree is a binary search tree, check:

- If a node is a left child, then its key and the keys of the nodes in its right subtree are less than its parent’s key.
- If a node is a right child, then its key and the keys of the nodes in its left subtree are greater than its parent’s key.

**What is America’s counter terrorism unit?**

NCTC produces analysis, maintains the authoritative database of known and suspected terrorists, shares information, and conducts strategic operational planning. NCTC is staffed by more than 1,000 personnel from across the IC, the Federal government, and Federal contractors.

**Is subtree of tree LeetCode?**

Subtree of Another Tree – LeetCode. Given the roots of two binary trees root and subRoot , return true if there is a subtree of root with the same structure and node values of subRoot and false otherwise. A subtree of a binary tree tree is a tree that consists of a node in tree and all of this node’s descendants.

### What is a subtree of a tree?

Subtree: any node in a tree and its descendants. Depth of a node: the number of steps to hop from the current node to the root node of the tree. Depth of a tree: the maximum depth of any of its leaves.

### Can BST have duplicates?

In a Binary Search Tree (BST), all keys in left subtree of a key must be smaller and all keys in right subtree must be greater. So a Binary Search Tree by definition has distinct keys and duplicates in binary search tree are not allowed.

**Is subtree proper?**

A subtree of a tree T is a tree S consisting of a node in T and all of its descendants in T. The subtree corresponding to the root node is the entire tree; the subtree corresponding to any other node is called a proper subtree.

**Is Mirror binary tree?**

A mirror tree is another binary tree with left and right children of all non-leaf nodes interchanged. The following image shows an example of a binary tree and the corressponding mirror tree.

## Is leaf node a subtree?

Tree basics Structurally, a complete binary tree consists of either a single node (a leaf) or a root node with a left and right subtree, each of which is itself either a leaf or a root node with two subtrees. The set of all nodes underneath a particular node x is called the subtree rooted at x.

## Can B+ tree have duplicates?

To handle duplicate keys in a B+ tree, as in multiple rows that have the same value, implementations typically force it to be unique by appending an additional hidden column to the table, and assigning it an auto-incrementing value when a record is created.

**How many children can a BST have?**

A binary search tree (BST) adds these two characteristics: Each node has a maximum of up to two children.

**What is the difference between BST and heap?**

The Heap differs from a Binary Search Tree. The BST is an ordered data structure, however, the Heap is not. In computer memory, the heap is usually represented as an array of numbers. The heap can be either Min-Heap or Max-Heap.