Question 1

What is DSA and why is it important for interviews?

Accepted Answer

DSA (Data Structures and Algorithms) forms the foundation of coding interviews at top tech companies. It tests problem-solving skills, coding ability, and understanding of time/space complexity. Companies like Google, Amazon, Meta, and Microsoft heavily focus on DSA in their technical interviews.

Question 2

How many DSA problems should I solve before interviews?

Accepted Answer

For FAANG-level interviews, aim to solve 150-200 quality problems covering all major topics. Focus on understanding patterns rather than memorizing solutions. Cover: 30+ Array/String problems, 20+ Tree problems, 15+ Graph problems, 25+ DP problems, and 10+ problems each for Stack, Heap, and Binary Search.

Question 3

What topics are most important for DSA interviews?

Accepted Answer

Key DSA topics: Arrays & Strings (Two Sum, Sliding Window), Binary Search, Linked Lists, Trees & BST (traversals, LCA), Graphs (BFS, DFS, shortest path), Dynamic Programming (1D & 2D), Stack & Queue, Heap/Priority Queue, Backtracking, and Greedy Algorithms.

Question 4

Is InstaMock DSA practice free?

Accepted Answer

Yes! InstaMock offers 150+ DSA problems for free with instant code execution in Java, Python, and C++. You can run test cases, submit solutions, and get immediate feedback without any payment.

Question 5

How is InstaMock different from LeetCode?

Accepted Answer

InstaMock combines DSA practice with AI mock interviews. While you can solve coding problems like LeetCode, you also get AI-powered interview simulations, real-time feedback, and comprehensive preparation for System Design (HLD/LLD) along with DSA.