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danluu's profile
Dan Luu
Dan Luu
Dan Luu
@danluu

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Dan Luu

@danluu

https://patreon.com/danluu 

danluu.com
Joined December 2008

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    Dan Luu‏ @danluu Jan 5
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    Algorithms interviews: theory vs. practice https://danluu.com/algorithms-interviews/ …

    5:26 AM - 5 Jan 2020
    • 173 Retweets
    • 545 Likes
    • sailor✨ G 🧘‍♂️📖🌲☕️ ADinAM Sriram Thaiyar Michael Hoffman Ben Williamson Alexis La Porte 𝓙𝓲𝓶 😷Stay at home😷 𝓛𝓲𝓾 Abhishek Choudhary
    16 replies 173 retweets 545 likes
      1. New conversation
      2. Joseph Kaptur‏ @josephkaptur Jan 5
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        Replying to @danluu

        Thoughtful post as always, but I don’t agree with the premise that “algorithms questions are important to big companies because *fancy algorithms* are important there”.

        2 replies 0 retweets 0 likes
      3. Joseph Kaptur‏ @josephkaptur Jan 5
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        Replying to @josephkaptur @danluu

        It’s pretty easy to come up with “not bad” algorithms questions, which lets question banks be large, which means memorization matters less.

        1 reply 0 retweets 0 likes
      4. 8 more replies
      1. New conversation
      2. Heath Borders‏ @heathborders Jan 5
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        Replying to @danluu

        Thanks for this post! I've seen a lot of good engineers I've referred (because I previously worked with them for years) get rejected from positions at places I've worked because they couldn't pass a needlessly-hard interview.

        1 reply 0 retweets 4 likes
      3. Heath Borders‏ @heathborders Jan 5
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        Replying to @heathborders @danluu

        The problem with hiring is more general than tech, and is tied to the social stigma with firings and having a proper job history. Over a 6-month stretch, most non-prestigious tech companies could hire better by randomly choosing applicants, and firing bad ones after 6 months.

        2 replies 1 retweet 10 likes
      4. 12 more replies
      1. New conversation
      2. Mark Callaghan‏ @MarkCallaghanDB Jan 5
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        Replying to @danluu

        Pagination queries are a common source of O(n^2) in production - https://www.facebook.com/notes/mysql-at-facebook/limit-a-b-is-onn/206034210932 … Was there new GC pressure from your array resize fix? Growing the allocation by 1.5X or 2X means more allocated but unused memory.

        2 replies 0 retweets 8 likes
      3. Dan Luu‏ @danluu Jan 6
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        Replying to @MarkCallaghanDB

        Definitely could be a problem in some cases, but not in this case. Technically, there was probably an increase in old gen usage (this was on the JVM, using a generational collector), but it must've been trivial, small enough that it was unobservable in aggregate metrics.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2.  🐬‏ @jonatack Jan 5
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        Replying to @danluu @marionzualo

        Often true in engineering tech interviews: the preparation and ability to interview well are frequently uncorrelated with the ability to deliver good work. One workaround is to become a capable freelancer with referrals, social status/network and a good GitHub/GitLab profile.pic.twitter.com/uOPkKCpEr5

        1 reply 2 retweets 5 likes
      3. Daniel Bilar‏ @daniel_bilar Jan 5
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        Replying to @jonatack @danluu @marionzualo

        This is such a blindingly true statement, it boggles the mind that a typical gotcha tech interview is so decisive

        2 replies 0 retweets 3 likes
      4. 7 more replies
      1. New conversation
      2. Chris Granger‏ @ibdknox Jan 5
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        Replying to @danluu

        Thanks for the post dan! I’m curious is there a kind of interview that would resonate with you personally? What would the perfect interview look like? One where you felt you could demonstrate your skills and also get a sense for what the company has to offer.

        1 reply 0 retweets 3 likes
      3. Chris Granger‏ @ibdknox Jan 5
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        Replying to @ibdknox @danluu

        I’d also be really curious to learn more about what made that team you worked on the most productive - I hope you write more about that someday 🙂

        0 replies 0 retweets 3 likes
      4. End of conversation

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