Left Side View of Binary Tree in DSA C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Left Side View of a Binary Tree?

The Left Side View of a Binary Tree is the set of nodes visible when the tree is viewed from the left side. It includes the leftmost node at each level of the tree.

beginner

Which tree traversal method is commonly used to find the Left Side View of a Binary Tree?

Level Order Traversal (Breadth-First Search) is commonly used. We visit nodes level by level and pick the first node at each level to form the left side view.

beginner

In the Left Side View algorithm, why do we pick the first node at each level?

Because the first node visited at each level during level order traversal is the leftmost node visible from the left side.

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What data structure is typically used to implement the Left Side View algorithm?

A queue is used to perform level order traversal, which helps process nodes level by level.

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How does the Left Side View differ from the Right Side View of a Binary Tree?

The Left Side View shows the leftmost nodes at each level, while the Right Side View shows the rightmost nodes at each level when viewed from the right side.

What node do you add to the left side view list at each level during traversal?

A The middle node at that level

B The last node visited at that level

C The first node visited at that level

D All nodes at that level

The first node visited at each level during level order traversal is the leftmost node visible from the left side.

Which data structure helps in level order traversal for the left side view?

A Queue

B Stack

C Hash Map

D Linked List

A queue is used to process nodes level by level in level order traversal.

If a binary tree has only right children, what will the left side view contain?

A Only the root node

B Only leaf nodes

C No nodes

D All nodes in the tree

Since each level has only one node (the right child), that node is also the leftmost node at that level.

What traversal order is NOT typically used to find the left side view?

A Level Order Traversal

B Preorder Traversal

C Breadth-First Search

D Queue-based traversal

Preorder traversal is depth-first and does not guarantee visiting the leftmost node first at each level.

What is the time complexity of finding the left side view of a binary tree using level order traversal?

A O(n)

B O(log n)

C O(n^2)

D O(1)

Each node is visited once, so the time complexity is linear, O(n), where n is the number of nodes.

Explain how to find the Left Side View of a Binary Tree using level order traversal.

Think about how you see the tree from the left side and which nodes are visible.

Describe the difference between Left Side View and Right Side View of a Binary Tree.

Imagine standing on the left or right side of the tree.