In a binary tree, what does a level-order traversal use to keep track of nodes?
Practice Questions
Q1
In a binary tree, what does a level-order traversal use to keep track of nodes?
Stack
Queue
Array
Linked List
Questions & Step-by-Step Solutions
In a binary tree, what does a level-order traversal use to keep track of nodes?
Step 1: Understand what a binary tree is. A binary tree is a structure where each node has at most two children, called the left child and the right child.
Step 2: Know what level-order traversal means. Level-order traversal is a way to visit all the nodes in a binary tree level by level, starting from the root.
Step 3: Learn about a queue. A queue is a data structure that works like a line of people waiting. You can add people to the back of the line and take them from the front.
Step 4: Realize that during level-order traversal, we need to keep track of which nodes to visit next. This is where the queue comes in.
Step 5: When we start at the root of the tree, we add it to the queue. Then, we process the node at the front of the queue, which means we visit it and then add its children (if they exist) to the back of the queue.
Step 6: We repeat this process: take the next node from the front of the queue, visit it, and add its children to the back of the queue until the queue is empty.
