Hello everyone,

If you're preparing for technical interviews with product-based companies, this post is surely going to be a goldmine for you. Here, we'll delve into the top 100 DSA questions that are frequently asked by product-based companies. So, let's get started!

1. Array

Array-related problems are inevitable in any product company interview. Here are some commonly asked questions:

• Find the majority element in an array.
  
• Search an element in a sorted and rotated array.
  
• Find the "Kth" largest or smallest element in an array.
  
• Find the duplicate numbers in an array if it contains multiple duplicates.
  

2. Linked List

Linked list problems are also popular in interviews. Here are some examples:

• How to detect a loop in a linked list?
  
• How to reverse a linked list?
  
• How to find the middle of a linked list?
  
• How to merge two sorted linked lists?
  

3. Stack and Queue

Stack and Queue are essential data structures and are frequently seen in interview problems. Here are some questions:

• Design a stack with operations on middle element.
  
• How to implement a queue using a stack?
  
• How to check for balanced parentheses in an expression?
  
• How to implement LRU Cache?
  

4. Tree and Graph

Tree and Graph problems can be complex but are essential for clearing product-based company interviews. Here are some typical questions:

• Find the height of a binary tree.
  
• Detect cycle in a directed graph.
  
• Implement Depth First Search (DFS).
  
• Implement Breadth First Search (BFS).
  

5. Dynamic Programming

Dynamic programming is a key concept that is asked in many product-based companies' interviews. Here are some questions:

• How to solve the Knapsack problem?
  
• How to determine the longest increasing subsequence?
  
• How to find the longest common subsequence?
  
• How to solve the matrix chain multiplication problem?
  

This is just a glimpse of the DSA questions that product-based companies are likely to ask. It's recommended to practice these questions and understand the underlying concepts. Remember, practice is the key when it comes to cracking coding interviews.

Finally, always remember that knowing and understanding data structures and algorithms will not only help you to excel in interviews but also make you a better programmer. So, never stop learning and practicing.

Good luck with your preparation!