Day 7: Bridge Repair

Megathread guidelines

  • Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
  • You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://topaz.github.io/paste/ if you prefer sending it through a URL

FAQ

  • @mykl
    6•4 days ago

    Uiua

    This turned out to be reasonably easy in Uiua, though this solution relies on macros which maybe slow it down.

    (edit: removing one macro sped it up quite a bit)

    (edit2: Letting Uiua build up an n-dimensional array turned out to be the solution, though sadly my mind only works in 3 dimensions. Now runs against the live data in around 0.3 seconds.)

    Try it here

    Data   ← ⊜(□⊜⋕⊸(¬∈": "))⊸≠@\n "190: 10 19\n3267: 81 40 27\n83: 17 5\n156: 15 6\n7290: 6 8 6 15\n161011: 16 10 13\n192: 17 8 14\n21037: 9 7 18 13\n292: 11 6 16 20"
Calib! ← ≡◇⊢▽⊸≡◇(∈♭/[^0]:°⊂) # Calibration targets which can be constructed from their values.
&p/+Calib!⊃(+|×)Data
&p/+Calib!⊃(+|×|+×ⁿ:10+1⌊ₙ₁₀,)Data
    • @iAvicenna
      3•4 days ago

      I feel like I need a Rosetta stone to read this code

    • @[email protected]
      3•4 days ago

      Thanks to your solution I learned more about how to use reduce :D

      My solution did work for the example input but not for the actual one. When I went here and saw this tiny code block and you saying

      This turned out to be reasonably easy

      I was quite taken aback. And it’s so much better performance-wise too :D (well, until part 2 comes along in my case. Whatever this black magic is you used there is too high for my fried brain atm)

      • @mykl
        2•4 days ago

        Haha, sorry about that, it does seem quite smug :-) I went into it expecting it to be a nightmare of boxes and dimensions, but finding it something I could deal with was a massive relief. Of course once I had a working solution I reversed it back into a multi-dimensional nightmare. That’s where the performance gains came from: about 10x speedup from letting Uiua build up as many dimensions as it needed before doing a final deshaping.

        I enjoyed reading a different approach to this, and thanks for reminding me that ⋕$"__" exists, that’s a great idiom to have up your sleeve.

        Let me know if there’s any bits of my solution that you’d like me to talk you through.

        • @[email protected]
          2•4 days ago

          No worries, it does seem a lot less difficult in hindsight now, my mind just blanked at what I expected to be a lot more code :))

          That performance improvement is amazing, I’ll definitely take a look at how that works in detail later. Just gotta recover from the mental stretch gymnastics trying to remember the state of the stack at different code positions