Which of the following algorithms can be used to find the lowest common ancestor
Practice Questions
Q1
Which of the following algorithms can be used to find the lowest common ancestor in a binary tree?
Depth-first search
Breadth-first search
Dynamic programming
Binary search
Questions & Step-by-Step Solutions
Which of the following algorithms can be used to find the lowest common ancestor in a binary tree?
Step 1: Understand what a binary tree is. A binary tree is a data structure where each node has at most two children, referred to as the left child and the right child.
Step 2: Know what the lowest common ancestor (LCA) means. The LCA of two nodes in a binary tree is the deepest node that is an ancestor of both nodes.
Step 3: Learn about depth-first search (DFS). DFS is a method for exploring nodes and edges of a tree or graph by going as deep as possible down one branch before backing up.
Step 4: Realize that DFS can be used to traverse the binary tree. By using DFS, you can explore each node and check if it is the LCA of the two given nodes.
Step 5: Implement the DFS algorithm to find the LCA. You will check each node, and if you find both nodes in the left and right subtrees of a node, that node is the LCA.
