Embarking on the journey to land your **dream tech job**? You’re in the right place. Our “Top 100 **Data Structure and Algorithms DSA **Interview Questions Topic-wise” guide is tailored to help you navigate through the most **common and challenging questions** you might encounter. Let’s boost your confidence and ensure you’re interview-ready!

__Why Focus on Data Structures and Algorithms (DSA)?__

__Why Focus on Data Structures and Algorithms (DSA)?__

Data Structures and Algorithms are the building blocks of** computer science.** They are critical in designing efficient **software** and are a favourite topic among interviewers to assess a candidate’s problem-solving skills.

The top 100 questions will revolve around these topics.

**¡****》Array and String Questions**

1. How do you reverse an array in place?

2. What is the most efficient way to concatenate strings in Java?

**¡¡****》Linked List Questions**

1. Can you explain how to detect a cycle in a linked list?

2. What are the advantages of using a doubly-linked list over a singly-linked list?

**¡¡¡****》Stack and Queue Questions**

1. How would you implement a **queue** using two **stacks**?

2. What real-world scenarios can be modelled with a stack?

**¡V****》Tree and Graph Questions**

1. Describe the algorithm for a depth-first search on a binary tree.

2. What is the difference between a tree and a graph data structure?

**V ****》Sorting and Searching Questions**

1. When would you use merge sort over quicksort?

2. How does binary search work, and why is it efficient?

**V¡****》Advanced DSA Questions**

1. Explain the concept of dynamic programming with an example.

2. How do hash tables handle collisions?

**V¡¡****》Behavioural Questions**

1. Describe a time when you optimized an algorithm.

2. How do you approach learning a new data structure or algorithm?

__The top 100 DSA Interview Questions__

__The top 100 DSA Interview Questions__

Here a Are the links to top 100 DSA Interview Questions. Remember these questions are segregated based on the **data structures and algorithms used to solve them. **So let’s get started.

**1. DSA Interview Questions on Array**

- Check if pair with the given Sum exists in Array
- Best Time to Buy and Sell Stock
- Find duplicates
- Product of Array Except Self
- Maximum Subarray
- Maximum Product Subarray
- Find Minimum in Rotated Sorted Array
- Search in Rotated Sorted Array
- 3 Sum
- Container With Most Water
- Find the Factorial of a large number
- Trapping Rain Water
- Chocolate Distribution Problem
- Insert Interval
- Merge Intervals
- Non-overlapping Intervals

**2. DSA Interview Questions on Matrix**

- Set Matrix Zeroes
- Spiral Matrix
- Program to find the transpose of a matrix
- Word Search

**3. DSA Interview Questions on String**

- Longest Substring Without Repeating Characters
- Longest Repeating Character Replacement
- Smallest window in a String containing all characters of other String
- Check whether two Strings are anagram of each other
- Print all anagrams together
- Check if given Parentheses expression is balanced or not
- Sentence Palindrome
- Longest Palindromic Substring
- Palindromic Substrings
- Longest Common Prefix

**4. DSA Interview Questions on Linked List**

- Reverse a Linked List
- Detect Cycle in a Linked List
- Merge Two Sorted Lists
- Merge K Sorted Lists
- Remove Nth Node From End Of List
- Reorder List
- Add 1 to a number represented as linked list
- Find the middle of a given linked list
- Delete last occurrence of an item from linked list

**5. DSA Interview Questions on Stack & Queue**

- Convert Infix expression to Postfix expression
- Next Greater Element
- Delete middle element of a stack
- Check mirror in n-ary tree
- The Celebrity Problem
- Length of the longest valid substring
- Print Right View of a Binary Tree
- Find the first circular tour that visits all petrol pumps

**6. DSA Interview Questions on Tree**

- Maximum Depth of Binary Tree
- Check if two trees have same structure
- Invert/Flip Binary Tree
- Binary Tree Maximum Path Sum
- Binary Tree Level Order Traversal
- Serialize and Deserialize Binary Tree
- Subtree of Another Tree
- Construct Binary Tree from Preorder and Inorder Traversal
- Validate Binary Search Tree
- Kth Smallest Element in a BST
- Lowest Common Ancestor of BST
- Implement Trie (Prefix Tree)
- Add and Search Word

**7. DSA Interview Questions on Heap**

- Top K Frequent Elements
- Find Median from Data Stream
- Largest triplet product in a stream
- Connect n ropes with minimum cost

**8. DSA Interview Questions on Graph**

- Clone Graph
- Course Schedule
- Pacific Atlantic Water Flow
- Number of Islands
- Longest Consecutive Sequence
- Snake and Ladder Problem
- Detect Cycle in a Directed Graph
- Bridges in a graph
- Check whether a given graph is Bipartite or not
- Find size of the largest region in Boolean Matrix
- Flood fill Algorithm
- Strongly Connected Components
- Topological Sorting

**9. DSA Interview Questions on Dynamic Programming**

- Count ways to reach the n’th stair
- Coin Change
- 0/1 Knapsack Problem
- Longest Increasing Subsequence
- Longest Common Subsequence
- Word Break Problem
- Dice Throw
- Egg Dropping Puzzle
- Matrix Chain Multiplication
- Combination Sum
- Subset Sum Problem
- Find maximum possible stolen value from houses
- Count Possible Decodings of a given Digit Sequence
- Unique paths in a Grid with Obstacles
- Jump Game
- Cutting a Rod
- Maximum Product Cutting
- Count number of ways to cover a distance

**10. DSA Interview Questions on Bit Manipulations**

- Number of 1 Bits
- Counting Bits
- Missing Number
- Reverse Bits
- Find XOR of all subsets of a set

These are the top 100 DSA Interview Questions. Practice them to equip your self with DSA.

**Conclusion**

Congratulations on making it through our “Top 100 Data Structure and Algorithms DSA Interview Questions Topic-wise” guide. Remember, **understanding the concepts** is just the beginning.

**Practice** is key to mastering DSA, so dive into **coding challenges,** and don’t be afraid to tackle problems from different angles. Good luck with your interviews, and may your code always compile on the first try.

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