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

101

Predecessor and Successor In BST

7

Moderate

25 mins

163

Duplicate Subtrees

2

Moderate

30 mins

42

Zigzag Binary Tree Traversal

3

Easy

10 mins

79

Vertical Order Traversal

0

Moderate

35 mins

150

Construct Binary Tree From Inorder and Preorder Traversal

11

Easy

10 mins

189

LCA Of Binary Tree

5

Moderate

10 mins

234

Diameter Of Binary Tree

5

Easy

10 mins

314

Binary Tree Cameras

7

Hard

50 mins

81

Sum of Distance

6

Hard

25 mins

13

Is Height Balanced Binary Tree

11

Moderate

15 mins

278

Longest Consecutive Sequence In A Binary Tree

1

Moderate

15 mins

40

Modify BST

3

Moderate

20 mins

25

Flip Equivalent Binary Tree

1

Moderate

25 mins

20

Maximum Difference Between Node And Ancestor

2

Easy

10 mins

27

Tree Traversals

8

Easy

15 mins

264

LCA In A BST

4

Moderate

15 mins

210

Count Complete Binary Tree Nodes

2

Easy

10 mins

73

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

0

Easy

20 mins

31

All Root to Leaf Paths In Binary Tree.

0

Moderate

25 mins

74

Closest Leaf To Given Node In Binary Tree

7

Moderate

15 mins

150

Longest Univalue Path

193

Moderate

10 mins

502

Least Common Ancestor

4

Moderate

25 mins

130

Sum root to leaf

24

Easy

10 mins

550

BST Iterator

7

Moderate

20 mins

77

Count unique BSTs.

Hard

2 upvotes

Predecessor and Successor In BST

Moderate

7 upvotes

Duplicate Subtrees

Moderate

2 upvotes

Zigzag Binary Tree Traversal

Easy

3 upvotes

Vertical Order Traversal

Moderate

0 upvotes

Construct Binary Tree From Inorder and Preorder Traversal

Easy

11 upvotes

LCA Of Binary Tree

Moderate

5 upvotes

Diameter Of Binary Tree

Easy

5 upvotes

Binary Tree Cameras

Hard

7 upvotes

Sum of Distance

Hard

6 upvotes

Is Height Balanced Binary Tree

Moderate

11 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

8 upvotes

LCA In A BST

Moderate

4 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

193 upvotes

Least Common Ancestor

Moderate

4 upvotes

Sum root to leaf

Easy

24 upvotes

BST Iterator

Moderate

7 upvotes

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