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Algorithms Interviews: Theory vs. Practice

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Resurfaced independently across 4 calendar years, with breakout response in 2 of them.

submissions
6
submitters
6
observed span
2020–2025
peak thread · 76 comments
265 pts
latest 20+ return · 2024-06-02
82 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

> a friend of mine once got a Google Code Jam World Finals question in a phone interview with Google (...) I doubt there were more than a few hundred people in the world who would've gotten the right answer to the question in a phone screen and almost all of them probably would've realized that it was an absurd phone screen question Link to the question: https://code.google.com/codejam/contest/2437491/dashboard#s=... The gist of it is: You are given 4*N points on a…

fyp·265-point thread·

I have definitely seen senior developers put quadratic and even exponential algorithms into production and cause global outages. Code review didn't help, because their code was reviewed by other people who were interviewed to the same low standard. I continue to insist on algorithm & data structure interviews for software engineer candidates. Not every project needs them as much, but in large enough institutions, every engineer is likely to run into at least one project that does. If they can't…

fl0ki·82-point thread·

What's even more interesting is the new meta-game around interviews. Algorithmic questions started with Microsoft, who wanted to make sure engineering hires could... program! The point was to make it as language agnostic as possible and friendly to college hires (since everyone who did a serious CS program did algorithms, there was a common vocabulary). You weren't even meant to study intensively for these, just brush up on your algo class. But now I keep seeing guides on the internet…

what is this site http://go/easy-perf author refers to? can't find it anywhere

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
406

reference only — not used in Hall rules or ranking

Total comments
152

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2020-01-05Algorithms Interviews: Theory vs. PracticeFirst breakout · Best threadjakevoytko26576
2021-10-12Algorithms Interviews: Theory vs. Practiceprogram247365528
2024-02-24Algorithms Interviews: Theory vs. Practice_xivi51
2024-04-05Algorithms Interviews: Theory vs. Practiceherecomethefuzz10
2024-06-02Algorithms Interviews: Theory vs. Practice (2020)Latest 20+ point returnVadim_samokhin8267
2025-12-05Algorithms Interviews: Theory vs. Practiceb-man10