Check out the top trees and graphs data structure interview questions asked in interviews of top tech companies like Amazon, only on CodeStudio. Start Practicing now!

Problem Title

Difficulty

Avg Time to solve

Attempted

Count unique BSTs.

2

Hard

15 mins

88

Predecessor and Successor In BST

7

Moderate

25 mins

109

Duplicate Subtrees

2

Moderate

30 mins

32

Zigzag Binary Tree Traversal

1

Easy

10 mins

59

Vertical Order Traversal

0

Moderate

35 mins

83

Construct Binary Tree From Inorder and Preorder Traversal

8

Easy

10 mins

125

LCA Of Binary Tree

4

Moderate

10 mins

173

Diameter Of Binary Tree

2

Easy

10 mins

195

Binary Tree Cameras

7

Hard

50 mins

66

Sum of Distance

5

Hard

25 mins

12

Is Height Balanced Binary Tree

9

Moderate

15 mins

158

Longest Consecutive Sequence In A Binary Tree

1

Moderate

15 mins

34

Modify BST

3

Moderate

20 mins

20

Flip Equivalent Binary Tree

1

Moderate

25 mins

15

Maximum Difference Between Node And Ancestor

2

Easy

10 mins

23

Tree Traversals

2

Easy

15 mins

155

LCA In A BST

3

Moderate

15 mins

112

Count Complete Binary Tree Nodes

2

Easy

10 mins

58

Find a Corresponding Node of a Binary Tree in a Clone of That Tree

0

Easy

20 mins

28

All Root to Leaf Paths In Binary Tree.

0

Moderate

25 mins

58

Closest Leaf To Given Node In Binary Tree

7

Moderate

15 mins

130

Longest Univalue Path

158

Moderate

10 mins

350

Least Common Ancestor

2

Moderate

25 mins

95

Sum root to leaf

20

Easy

10 mins

413

BST Iterator

7

Moderate

20 mins

55

Count unique BSTs.

Hard

2 upvotes

Predecessor and Successor In BST

Moderate

7 upvotes

Duplicate Subtrees

Moderate

2 upvotes

Zigzag Binary Tree Traversal

Easy

1 upvote

Vertical Order Traversal

Moderate

0 upvotes

Construct Binary Tree From Inorder and Preorder Traversal

Easy

8 upvotes

LCA Of Binary Tree

Moderate

4 upvotes

Diameter Of Binary Tree

Easy

2 upvotes

Binary Tree Cameras

Hard

7 upvotes

Sum of Distance

Hard

5 upvotes

Is Height Balanced Binary Tree

Moderate

9 upvotes

Longest Consecutive Sequence In A Binary Tree

Moderate

1 upvote

Modify BST

Moderate

3 upvotes

Flip Equivalent Binary Tree

Moderate

1 upvote

Maximum Difference Between Node And Ancestor

Easy

2 upvotes

Tree Traversals

Easy

2 upvotes

LCA In A BST

Moderate

3 upvotes

Count Complete Binary Tree Nodes

Easy

2 upvotes

Find a Corresponding Node of a Binary Tree in a Clone of That Tree

Easy

0 upvotes

All Root to Leaf Paths In Binary Tree.

Moderate

0 upvotes

Closest Leaf To Given Node In Binary Tree

Moderate

7 upvotes

Longest Univalue Path

Moderate

158 upvotes

Least Common Ancestor

Moderate

2 upvotes

Sum root to leaf

Easy

20 upvotes

BST Iterator

Moderate

7 upvotes

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