Recent content by Paul F

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  1. Paul F

    My Favourite Math Joke

    Two mathematicians are in a bar. The first one says to the second that the average person knows very little about basic mathematics. The second one disagrees, and claims that most people can cope with a reasonable amount of math. The first mathematician goes off to the washroom, and in his...
  2. Paul F

    6.1 or 7.0

    Steve mentioned his idea first in Security Now! 420 with the acronym HIPS for Hiding in Plain Sight. In Episode 424 he introduced SQRL.
  3. Paul F

    Raspberry Pi Pico and the Next Generation

    Here's an entertaining video about controlling LEDs with a Raspberry Pi:
  4. Paul F

    What is this DOS thing

    This may interest you: https://forums.grc.com/threads/pc-javascript-machines-featuring-grcs-flicker-free-1-0.257/post-2126
  5. Paul F

    Advent of Code

    I fell behind for about a week but managed to catch up and finish before New Year's. I'm not a fast programmer and not about to win any speed records. I'm more interested in taking my time and just enjoying the programming. It is, however, annoying when you miss something that you later...
  6. Paul F

    Advent of Code

    Many congratulations!
  7. Paul F

    Advent of Code

    My approach is almost one-pass. It's very crude but gets the job done for the puzzle.
  8. Paul F

    Advent of Code

    Day 18 was a lot of work for me too. It was interesting enough that didn't mind spending a lot of time on it.
  9. Paul F

    Advent of Code

    Day 17: What's interesting about this puzzle is that it shows how easy it is to move from 3 dimensions to 4 dimensions in math and how difficult it is to visualize geometrically. But I'll give it a try. Start with a line 1 unit in length in 1 dimension. Repeat the line in the same direction...
  10. Paul F

    Advent of Code

    Those elves could memorize PI to 30, 000, 000 digits.
  11. Paul F

    Advent of Code

    Day 13 This one was fun.
  12. Paul F

    Advent of Code

    Day 12. This type of movement on a grid reminded me of this fascinating way to find the real roots of a polynomial:
  13. Paul F

    Advent of Code

    Oh! I didn't know that. That's really interesting. I guess that's to stop people from posting just the answers. Each person probably gets input data randomly from a pre-generated set . It explains a message I got for an incorrect answer saying that it matched a different person's answer.
  14. Paul F

    Advent of Code

    Agreed, but the input layout is square (98x98), which interestingly becomes 100x100 if you add a floor border.
  15. Paul F

    Advent of Code

    Yes, my description was rather brief. I had to mull over the problem for a while before I really understood what we were dealing with, and considered various approaches before I hit upon that one. I was a bit surprised that the gigantic number it produced on its first run was the right answer...