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Ask HN: Examples of beautiful, nontrivial, code?

1 ポイント投稿者 minus116 年前1 コメント

The Magnetar Trade: How One Hedge Fund Helped Keep Bubble Going

propublica.org

23 ポイント投稿者 minus116 年前3 コメント

コメント

14 年前議論

What is your evidence for this factual assertion? (I have done a huge amount of research on IQ testing, and I have never seen a trace of a finding like this in any of the research literature.)

Have you found evidence contrary to this? Or are you taking issue with the parent's use of the term "higher IQ" rather than "higher perceived intelligence" or something similar? I'm asking out of genuine interest because the statement seems plausible to me (a layman) based on anecdotal evidence.

14 年前議論

The value of the round-robin stage is to establish team rankings before the single-elimination stage.

You have some alternatives, but no silver bullets:

* Establish rank before the tournament (in which case you're just moving the problem)

* Eliminate rank and seed teams randomly (which makes it much less likely to see the best teams medal)

* Use random seeding and a double-elimination structure (as a fan, I dislike double-elimination, but I'm not sure what the consensus is on this)

* Try to mitigate the problem by playing matches consecutively (you'll need lots of courts), hiding the actual seeding until the single-elimination round (people will assume you're corrupt), or other creative methods (you probably won't catch all the edge cases, so throw in a rule that says "you must try your hardest")

14 年前議論

Great article. I'm curious what your thoughts are on the Sub-Penny Rule.

14 年前議論

Design is something almost everyone feels qualified to criticize, so a post like this lends itself to all kinds of bikeshedding.

Fortunately, we live in the age of A/B testing. Rather than listening to any of the speculation in this thread, the thoughtful businessperson can actually quantify just how good or bad a design is at achieving its goal.

14 年前議論

Here's my mitzvah:

Don't do work for individuals or very small companies. People are much more reasonable when your fee isn't coming out of their pocket.

14 年前議論

I believe there is a clear legal difference here.

These things are over the line (and illegal):

  Using images without permission

  Using code without permission

  Referencing images and code from another site without permission

Gray area:

  Designing a site from scratch to roughly copy another site's design

15 年前議論

This sounds interesting. Can you provide more details?

15 年前議論

Anything based on the AVR USB series can be configured to auto-detect as a keyboard/joystick/misc (see http://www.fourwalledcubicle.com/LUFA.php), so that would simplify your comm layer. However, I'm not aware of a good off-the-shelf board that wouldn't require some microcontroller development.

I am actually working on a simplified AVR USB board for just this purpose, I'll post it to HN when I'm done.

15 年前議論

This is not a solved problem by any means. I finished in the top ten, and most competitive teams used a combination of image processing for chad suggestion and brute force. It required hundreds of man hours to reassemble just a handful of documents under controlled conditions.

Imagining a real-life scenario of dozens or hundreds of documents mixed together in a shredder bin makes my head hurt.

So, I wouldn't worry too much about your shredded docs just yet.

15 年前議論

One team used a crowd sourced "game" method with some success. They had thousands of people register, and were able to solve the first few problems quickly, but they began to stall on the more complex puzzles.

I was surprised to find that this method doesn't scale well when the puzzle reaches a certain size.

15 年前議論

This can be somewhat misleading for someone who isn't familiar with Detroit. When people say 'Detroit', they often mean the sprawling metropolitan area of the city of Detroit and the surrounding suburbs. The Detroit metro area has 4.4 million residents. The city of Detroit has only 700k. This article refers only to the city. And yes, the city has very few white residents. It is overwhelmingly poor and black.

It's not unusual, in the U.S., for urban centers to have a high minority concentration, but I believe this is much higher than most major cities.

15 年前議論

I presume you get a free name and an unpleasant nagging feeling from your conscience. It's probably not worth the effort to try to prevent this in the beginning.

15 年前議論

There's nothing wrong with market segmentation, this is simply a poor implementation. Adding a piece of foam to cripple the sound makes the consumer feel ripped off.

15 年前議論

I think it's important to expose kids to programming, and if they show an interest, to explore it further.

It's possible I never would have become a coder if a teacher hadn't given me a brief intro to Basic when I was 11 years old. I took it from there, and was self-taught until college.

With my own son, I introduced him to Scratch, helped him through a few lessons, and then watched as it became his favorite thing to do. I really can't say enough about Scratch as an introduction to programming. It gives kids a simple environment where they see quick results while learning the basics. Just as important, there is a social aspect in that they can easily share their programs with their friends. There does, however, seem to be a need to bridge the gap between Scratch and traditional languages.

16 年前議論

Typically jobs@ redirects to /dev/null.

16 年前議論

I had to look this up. It's Settings->About Phone->Battery Use

16 年前議論

I think the problem will be that the previous salaries have anchored the company's idea of his/her worth. Regardless, I agree that it's best to ask for what you feel you are worth.

16 年前議論

From their FAQ:

        * Google Chrome: version 4.249.4+
        * Mozilla Firefox: version: 3.5+
        * Apple Safari: version 3.1+
        * Opera: version 10.5+
        * Microsoft Internet Explorer: version 6+

        The Google Font API is not currently 
        supported on iPhone, iPad, iPod, or Android

16 年前議論

And I'm assuming that your definition of mediocre is actually "not as good as my idols". This seems common on HN. I've always been a top performer among my coworkers, but it's easy to ignore this and compare yourself only to those most successful.

16 年前議論

Can anyone recommend an html5 3d engine? Is pre3d currently the best?