Top 100 Data Structure and Algorithms DSA Interview Questions Topic-wise

DSA has been one of the most popular go-to topics for any interview, be it college placements, software developer roles, or any other technical roles for freshers and experienced to land a decent job. If you are among them, you already know that it is not easy to find the best DSA interview questions among the vast pool of available problems. So here we are, with the Top 100 most asked DSA interview questions to help you sail through your technical rounds.

DSA Interview Questions on Array

1. Pair with the given Sum
2. Best Time to Buy and Sell Stock
3. Find duplicates
4. Product of Array Except Self
5. Maximum Subarray
6. Maximum Product Subarray
7. Minimum in Rotated Sorted
8. Search in Rotated Sorted
9. 3 Sum
10. Container With Most Water
11. Factorial of a large number
12. Trapping Rain Water
13. Chocolate Distribution Problem
14. Insert Interval
15. Merge Intervals
16. Non-overlapping Intervals

For more, please refer Top 50 Array Interview Questions

DSA Interview Questions on Matrix

1. Set Matrix Zeroes
2. Spiral Matrix
3. Transpose of a matrix
4. Word Search

For more, please refer Top 50 Matrix Interview Questions

DSA Interview Questions on String

1. Longest Substring Without Repeating
2. Longest Repeating Character Replacement
3. Smallest window containing all characters
4. Check for Anagram
5. Print all anagrams together
6. Check Balanced Parentheses
7. Sentence Palindrome
8. Longest Palindromic Substring
9. Palindromic Substrings
10. Longest Common Prefix

For more, please refer Top 50 String Interview Questions

DSA Interview Questions on Linked List

1. Reverse a Linked List
2. Detect Cycle in a Linked List
3. Merge Two Sorted Lists
4. Merge K Sorted Lists
5. Remove Nth Node From End Of List
6. Reorder List
7. Add 1 to a number represented as linked list
8. Middle of a given linked list
9. Delete last occurrence from linked list

For more, please refer Top 50 Linked List Interview Questions

DSA Interview Questions on Stack & Queue

1. Infix to Postfix expression
2. Next Greater Element
3. Delete middle element of a stack
4. Check mirror in n-ary tree
5. The Celebrity Problem
6. Length of the longest valid substring
7. Print Right View of a Binary Tree
8. Find the first circular tour that visits all

For more, please refer Stack Interview Questions and Queue Interview Questions

DSA Interview Questions on Tree

1. Maximum Depth of Binary Tree
2. Check if two trees have same structure
3. Invert/Flip Binary Tree
4. Binary Tree Maximum Path Sum
5. Binary Tree Level Order Traversal
6. Serialize and Deserialize Binary Tree
7. Subtree of Another Tree
8. Construct Binary Tree from Preorder and Inorder Traversal
9. Validate Binary Search Tree
10. Kth Smallest Element in a BST
11. Lowest Common Ancestor of BST
12. Implement Trie (Prefix Tree)
13. Add and Search Word

For more, please refer Top 50 Tree Interview Questions

DSA Interview Questions on Heap

1. Top K Frequent Elements
2. Find Median from Data Stream
3. Largest triplet product in a stream
4. Connect n ropes with minimum cost

For more, please refer Top 50 Heap Interview Questions

DSA Interview Questions on Graph

1. Clone Graph
2. Course Schedule
3. Pacific Atlantic Water Flow
4. Number of Islands
5. Longest Consecutive Sequence
6. Snake and Ladder Problem
7. Detect Cycle in a Directed Graph
8. Bridges in a graph
9. Check whether a given graph is Bipartite or not
10. Find size of the largest region in Boolean Matrix
11. Flood fill Algorithm
12. Strongly Connected Components
13. Topological Sorting

For more, please refer Top 50 Graph Interview Questions

DSA Interview Questions on Dynamic Programming

1. Count ways to reach the n’th stair
2. Coin Change
3. 0/1 Knapsack Problem
4. Longest Increasing Subsequence
5. Longest Common Subsequence
6. Word Break Problem
7. Dice Throw 
8. Egg Dropping Puzzle
9. Matrix Chain Multiplication
10. Combination Sum
11. Subset Sum Problem
12. Find maximum possible stolen value from houses
13. Count Possible Decodings of a given Digit Sequence
14. Unique paths in a Grid with Obstacles
15. Jump Game
16. Cutting a Rod
17. Maximum Product Cutting
18. Count number of ways to cover a distance

For more, please refer Top 50 DP Interview Questions

DSA Interview Questions on Bit Manipulations

1. Number of 1 Bits
2. Counting Bits
3. Missing Number
4. Reverse Bits
5. Find XOR of all subsets of a set

For more, please refer Top Bit Manipulation Interview Questions

Related posts:

• Top 75 DSA Questions.
• Must Do Coding Questions for Companies like Amazon, Microsoft, Adobe, …
• Commonly Asked Data Structure Interview Questions

Some other important Tutorials:

• DSA Tutorial
• System Design Tutorial
• Software Development Roadmap
• Roadmap to become a Product Manager
• Learn SAP
• Learn SEO