...
Honestly? Your guess is as good as mine. It's Day 21, and we're exploiting an integer underflow bug in the space-time continuum? In order to save Christmas? I guess?
I think I'm going to have to spend some time on this one before I even understand exactly what it is that we have to do. All I know is that we are fiddling with the registers in our time machine again so that we don't go back in time indefinitely forever.
Ho. Ho. Ho.
Good luck! 🤶
Latest comments (4)
JavaScript solution
My case was exactly the same as @jmgimeno , I used the same analyzer from day 19 and I came down to the same conclusions as him:
As usual, I'm gonna omit reader.js which is the same as the other solutions and jump to the point:
21a.js
21b.js
For part 1, I used the same interpreter as in the previous days. I had to convert all registers to numbers, then I just waited until the final condition could be checked.
For part 2, the interpreter was too slow, so I rewrote the whole program by hand. Running it then took 2.5 minutes.
First I have translated the input into "assembler" using the disassembler I did for day 19, and then I reassembled the solution into C++.
In the code, the program exits when register 5 is equal to register 0.
So I've added the code to check those two conditions.
Don't know if I'm alone here but seeing all your posts starting with "AoC" over the past few days triggered a reaction in my brain that made me want to play AoE!!!