Recall & Review
beginner
What is Level Order Traversal in a tree?
Level Order Traversal visits nodes level by level from top to bottom and left to right within each level, like reading a book line by line.
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beginner
Which data structure is commonly used to implement Level Order Traversal (BFS) in trees?
A queue is used to keep track of nodes to visit next, ensuring nodes are processed in the order they appear by level.
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beginner
In Go, how do you represent a binary tree node for traversal?
A binary tree node is usually a struct with a value and pointers to left and right child nodes, for example:<br>
type TreeNode struct {
Val int
Left *TreeNode
Right *TreeNode
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intermediate
What is the time complexity of Level Order Traversal on a binary tree with n nodes?
The time complexity is O(n) because each node is visited exactly once during the traversal.
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intermediate
Why does Level Order Traversal use BFS instead of DFS?
Level Order Traversal needs to visit nodes level by level, which BFS naturally does by exploring neighbors first, while DFS goes deep before wide.
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Which data structure is essential for implementing Level Order Traversal (BFS) in a tree?
✗ Incorrect
Queue stores nodes in the order they are visited, enabling level-by-level traversal.
What is the first node visited in Level Order Traversal of a binary tree?
✗ Incorrect
Traversal starts at the root and proceeds level by level.
In Go, which keyword is used to define a struct for a tree node?
✗ Incorrect
The 'type' keyword defines a new struct type in Go.
What is the order of visiting nodes in Level Order Traversal?
✗ Incorrect
Level Order visits nodes level by level from top to bottom and left to right.
What is the time complexity of Level Order Traversal on a tree with n nodes?
✗ Incorrect
Each node is visited once, so time complexity is linear in number of nodes.
Explain how Level Order Traversal (BFS) works on a binary tree.
Think about visiting nodes like reading lines in a book.
You got /5 concepts.
Describe the Go struct definition for a binary tree node and how it supports Level Order Traversal.
Focus on how nodes connect to form the tree.
You got /4 concepts.