Python · Topic-wise · Interview-focused

The pattern is the
real problem.

A curated set of important DSA interview questions, grouped by the technique each one teaches. Find the pattern, open the solution, learn the shape.

View on GitHub Which pattern do I use?
01

Which pattern do I use?

Read the signal in a problem, then reach for the technique. Tap any row to filter the topics below.

02

Which data structure?

Patterns give you the plan; structures are the tools. Pick what you need to be fast and the matching structures light up.

Composite structures - some problems need two working together: LRU cache = hash map + doubly linked list · streaming median = two heaps · Dijkstra = graph + min-heap · sliding-window max = monotonic deque.
Read the full guide →
03

Browse every problem

Click a topic to expand its problems. Each links straight to the solution on GitHub. Difficulty is color-coded: easy, medium, hard. IMP marks priority problems.