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2022 day 16 part 1 (C) - before cleaning useless hash

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Bruno Raoult
2023-04-11 09:18:48 +02:00
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@@ -178,6 +178,96 @@ with this valve layout, =1651=.
Work out the steps to release the most pressure in 30 minutes. /What is
the most pressure you can release?/
To begin, [[file:16/input][get your puzzle input]].
Your puzzle answer was =1737=.
Answer:
The first half of this puzzle is complete! It provides one gold star: *
** --- Part Two ---
You're worried that even with an optimal approach, the pressure released
won't be enough. What if you got one of the elephants to help you?
It would take you 4 minutes to teach an elephant how to open the right
valves in the right order, leaving you with only /26 minutes/ to
actually execute your plan. Would having two of you working together be
better, even if it means having less time? (Assume that you teach the
elephant before opening any valves yourself, giving you both the same
full 26 minutes.)
In the example above, you could teach the elephant to help you as
follows:
#+begin_example
== Minute 1 ==
No valves are open.
You move to valve II.
The elephant moves to valve DD.
== Minute 2 ==
No valves are open.
You move to valve JJ.
The elephant opens valve DD.
== Minute 3 ==
Valve DD is open, releasing 20 pressure.
You open valve JJ.
The elephant moves to valve EE.
== Minute 4 ==
Valves DD and JJ are open, releasing 41 pressure.
You move to valve II.
The elephant moves to valve FF.
== Minute 5 ==
Valves DD and JJ are open, releasing 41 pressure.
You move to valve AA.
The elephant moves to valve GG.
== Minute 6 ==
Valves DD and JJ are open, releasing 41 pressure.
You move to valve BB.
The elephant moves to valve HH.
== Minute 7 ==
Valves DD and JJ are open, releasing 41 pressure.
You open valve BB.
The elephant opens valve HH.
== Minute 8 ==
Valves BB, DD, HH, and JJ are open, releasing 76 pressure.
You move to valve CC.
The elephant moves to valve GG.
== Minute 9 ==
Valves BB, DD, HH, and JJ are open, releasing 76 pressure.
You open valve CC.
The elephant moves to valve FF.
== Minute 10 ==
Valves BB, CC, DD, HH, and JJ are open, releasing 78 pressure.
The elephant moves to valve EE.
== Minute 11 ==
Valves BB, CC, DD, HH, and JJ are open, releasing 78 pressure.
The elephant opens valve EE.
(At this point, all valves are open.)
== Minute 12 ==
Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
...
== Minute 20 ==
Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
...
== Minute 26 ==
Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
#+end_example
With the elephant helping, after 26 minutes, the best you could do would
release a total of =1707= pressure.
/With you and an elephant working together for 26 minutes, what is the
most pressure you could release?/