Day 8: Haunted Wasteland

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)
  • Code block support is not fully rolled out yet but likely will be in the middle of the event. Try to share solutions as both code blocks and using something such as https://topaz.github.io/paste/ , pastebin, or github (code blocks to future proof it for when 0.19 comes out and since code blocks currently function in some apps and some instances as well if they are running a 0.19 beta)

FAQ

  • cvttsd2si@programming.dev
    2·
    11 months ago

    re [^1]: yeah, but that may explode the runtime again. Do you have any idea if this is possible to solve without brute forcing the combinations?

    • hades@lemm.ee
      1·
      11 months ago

      I don’t think it will explode the runtime. If you have multiple feasible values for e per ghost, you just need to find a combination of e_i such that e_1 = e_2 = ... = e_K (mod gcd(c_1, c_2, ... c_K)), which is just an intersection of K sets of at most I*N elements.