adventofcode/2024/day23/problem

[1]Advent of Code

--- Day 23: LAN Party ---

   As The Historians wander around a secure area at Easter Bunny HQ, you come
   across posters for a [16]LAN party scheduled for today! Maybe you can find
   it; you connect to a nearby [17]datalink port and download a map of the
   local network (your puzzle input).

   The network map provides a list of every connection between two computers.
   For example:

 kh-tc
 qp-kh
 de-cg
 ka-co
 yn-aq
 qp-ub
 cg-tb
 vc-aq
 tb-ka
 wh-tc
 yn-cg
 kh-ub
 ta-co
 de-co
 tc-td
 tb-wq
 wh-td
 ta-ka
 td-qp
 aq-cg
 wq-ub
 ub-vc
 de-ta
 wq-aq
 wq-vc
 wh-yn
 ka-de
 kh-ta
 co-tc
 wh-qp
 tb-vc
 td-yn

   Each line of text in the network map represents a single connection; the
   line kh-tc represents a connection between the computer named kh and the
   computer named tc. Connections aren't directional; tc-kh would mean
   exactly the same thing.

   LAN parties typically involve multiplayer games, so maybe you can locate
   it by finding groups of connected computers. Start by looking for sets of
   three computers where each computer in the set is connected to the other
   two computers.

   In this example, there are 12 such sets of three inter-connected
   computers:

 aq,cg,yn
 aq,vc,wq
 co,de,ka
 co,de,ta
 co,ka,ta
 de,ka,ta
 kh,qp,ub
 qp,td,wh
 tb,vc,wq
 tc,td,wh
 td,wh,yn
 ub,vc,wq

   If the Chief Historian is here, and he's at the LAN party, it would be
   best to know that right away. You're pretty sure his computer's name
   starts with t, so consider only sets of three computers where at least one
   computer's name starts with t. That narrows the list down to 7 sets of
   three inter-connected computers:

 co,de,ta
 co,ka,ta
 de,ka,ta
 qp,td,wh
 tb,vc,wq
 tc,td,wh
 td,wh,yn

   Find all the sets of three inter-connected computers. How many contain at
   least one computer with a name that starts with t?

   Your puzzle answer was 1485.

--- Part Two ---

   There are still way too many results to go through them all. You'll have
   to find the LAN party another way and go there yourself.

   Since it doesn't seem like any employees are around, you figure they must
   all be at the LAN party. If that's true, the LAN party will be the largest
   set of computers that are all connected to each other. That is, for each
   computer at the LAN party, that computer will have a connection to every
   other computer at the LAN party.

   In the above example, the largest set of computers that are all connected
   to each other is made up of co, de, ka, and ta. Each computer in this set
   has a connection to every other computer in the set:

 ka-co
 ta-co
 de-co
 ta-ka
 de-ta
 ka-de

   The LAN party posters say that the password to get into the LAN party is
   the name of every computer at the LAN party, sorted alphabetically, then
   joined together with commas. (The people running the LAN party are clearly
   a bunch of nerds.) In this example, the password would be co,de,ka,ta.

   What is the password to get into the LAN party?

   Your puzzle answer was cc,dz,ea,hj,if,it,kf,qo,sk,ug,ut,uv,wh.

   Both parts of this puzzle are complete! They provide two gold stars: **

   At this point, you should [18]return to your Advent calendar and try
   another puzzle.

   If you still want to see it, you can [19]get your puzzle input.

References

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  16. https://en.wikipedia.org/wiki/LAN_party
  17. https://adventofcode.com/2016/day/9
  18. https://adventofcode.com/2024
  19. https://adventofcode.com/2024/day/23/input