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Comment by barry-cotter | Hacker News Reader

> Data Structures and Introduction to Algorithms: everyone needs this and it is maybe 50% of leet code problems

What’s the other 50%? I’d have thought DS&A would cover everything.

A standard Introduction DSA course will generally not cover advanced DSA stuff like segment trees or Heavy-light decomposition, or theoretical stuff like number theory, or computational geometry all that stuff you would find in the competitive programming space.

Are there companies that ask a lot of leetcode bards in their interviews? That seems like overkill even for FAANGs though I can see why some groups might do so purely to filter by Math ability/interest.

From what I've seen and heard: Salesforce, Codenation, Wells Fargo, DE Shaw, so basically Hedge fund/finance or teaching/coaching/consultancy.

> segment trees or Heavy-light decomposition, or theoretical stuff like number theory, or computational geometry

I am not sure if there are any problems on leetcode that require any of these, but based on a sample of a few of their contests, if they exist they are a very small fraction (<<50%) of all problems.

The vast majority require:

- no DS&A knowledge whatsoever

- basic techniques (recursion, simple graph/tree algos, binary search, simple dynamic programming)

I do CP on various sites so I don't know if it's for Leetcode in particular. But some companies like Salesforce or DE Shaw or Codenation do include advanced problems on their tests.

I think I know more about interview questions then leet prep, but I find the remaining 50% is specific to the job but in the same vein as data structures and algorithms. So in game programming maybe it is a path finding problem or 3d math hit detection. In backend it’s an algorithm about network flow or caching. Still data structures, but more practical for the role!

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