Question 1

What DSA topics are most important for coding interviews?

Accepted Answer

Arrays and strings, linked lists, trees and graphs, dynamic programming, binary search, and sliding window cover 80%+ of interview questions. Hash maps appear in almost every problem. Prioritise these over niche topics.

Question 2

How many LeetCode problems should I solve to be interview-ready?

Accepted Answer

Focus on 150–200 curated problems solved deeply over random quantity. The Blind 75 and NeetCode 150 lists are excellent starting points. Understand every pattern, not just the solution.

Question 3

What language should I use for coding interviews?

Accepted Answer

Use whichever language you know best — interviewers care about logic over syntax. Python is popular for its conciseness. Java and C++ are also fully accepted. Avoid switching languages mid-preparation.

Question 4

How do I handle a problem I have never seen before in an interview?

Accepted Answer

Start by clarifying the problem and examples. Think aloud about patterns it resembles. Code a brute-force first, then optimise. Interviewers value communication and problem-solving approach over getting the optimal solution immediately.

Question 5

What is the best way to approach dynamic programming problems?

Accepted Answer

Identify if the problem has overlapping subproblems and optimal substructure. Define the state clearly, write the recurrence relation, then implement top-down (memoisation) first before converting to bottom-up. Practice 20–30 DP problems to recognise patterns.

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