270 lines
9.0 KiB
Plaintext
270 lines
9.0 KiB
Plaintext
Advent of Code
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br0xen (AoC++) 47*
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--- Day 16: Proboscidea Volcanium ---
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The sensors have led you to the origin of the distress signal: yet another handheld device, just like the one the Elves gave you. However, you don't see
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any Elves around; instead, the device is surrounded by elephants! They must have gotten lost in these tunnels, and one of the elephants apparently
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figured out how to turn on the distress signal.
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The ground rumbles again, much stronger this time. What kind of cave is this, exactly? You scan the cave with your handheld device; it reports mostly
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igneous rock, some ash, pockets of pressurized gas, magma... this isn't just a cave, it's a volcano!
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You need to get the elephants out of here, quickly. Your device estimates that you have 30 minutes before the volcano erupts, so you don't have time to
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go back out the way you came in.
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You scan the cave for other options and discover a network of pipes and pressure-release valves. You aren't sure how such a system got into a volcano,
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but you don't have time to complain; your device produces a report (your puzzle input) of each valve's flow rate if it were opened (in pressure per
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minute) and the tunnels you could use to move between the valves.
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There's even a valve in the room you and the elephants are currently standing in labeled AA. You estimate it will take you one minute to open a single
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valve and one minute to follow any tunnel from one valve to another. What is the most pressure you could release?
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For example, suppose you had the following scan output:
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Valve AA has flow rate=0; tunnels lead to valves DD, II, BB
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Valve BB has flow rate=13; tunnels lead to valves CC, AA
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Valve CC has flow rate=2; tunnels lead to valves DD, BB
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Valve DD has flow rate=20; tunnels lead to valves CC, AA, EE
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Valve EE has flow rate=3; tunnels lead to valves FF, DD
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Valve FF has flow rate=0; tunnels lead to valves EE, GG
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Valve GG has flow rate=0; tunnels lead to valves FF, HH
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Valve HH has flow rate=22; tunnel leads to valve GG
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Valve II has flow rate=0; tunnels lead to valves AA, JJ
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Valve JJ has flow rate=21; tunnel leads to valve II
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All of the valves begin closed. You start at valve AA, but it must be damaged or jammed or something: its flow rate is 0, so there's no point in opening
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it. However, you could spend one minute moving to valve BB and another minute opening it; doing so would release pressure during the remaining 28
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minutes at a flow rate of 13, a total eventual pressure release of 28 * 13 = 364. Then, you could spend your third minute moving to valve CC and your
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fourth minute opening it, providing an additional 26 minutes of eventual pressure release at a flow rate of 2, or 52 total pressure released by valve
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CC.
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Making your way through the tunnels like this, you could probably open many or all of the valves by the time 30 minutes have elapsed. However, you need
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to release as much pressure as possible, so you'll need to be methodical. Instead, consider this approach:
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== Minute 1 ==
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No valves are open.
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You move to valve DD.
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== Minute 2 ==
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No valves are open.
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You open valve DD.
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== Minute 3 ==
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Valve DD is open, releasing 20 pressure.
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You move to valve CC.
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== Minute 4 ==
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Valve DD is open, releasing 20 pressure.
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You move to valve BB.
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== Minute 5 ==
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Valve DD is open, releasing 20 pressure.
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You open valve BB.
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== Minute 6 ==
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Valves BB and DD are open, releasing 33 pressure.
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You move to valve AA.
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== Minute 7 ==
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Valves BB and DD are open, releasing 33 pressure.
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You move to valve II.
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== Minute 8 ==
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Valves BB and DD are open, releasing 33 pressure.
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You move to valve JJ.
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== Minute 9 ==
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Valves BB and DD are open, releasing 33 pressure.
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You open valve JJ.
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== Minute 10 ==
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Valves BB, DD, and JJ are open, releasing 54 pressure.
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You move to valve II.
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== Minute 11 ==
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Valves BB, DD, and JJ are open, releasing 54 pressure.
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You move to valve AA.
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== Minute 12 ==
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Valves BB, DD, and JJ are open, releasing 54 pressure.
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You move to valve DD.
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== Minute 13 ==
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Valves BB, DD, and JJ are open, releasing 54 pressure.
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You move to valve EE.
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== Minute 14 ==
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Valves BB, DD, and JJ are open, releasing 54 pressure.
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You move to valve FF.
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== Minute 15 ==
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Valves BB, DD, and JJ are open, releasing 54 pressure.
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You move to valve GG.
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== Minute 16 ==
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Valves BB, DD, and JJ are open, releasing 54 pressure.
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You move to valve HH.
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== Minute 17 ==
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Valves BB, DD, and JJ are open, releasing 54 pressure.
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You open valve HH.
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== Minute 18 ==
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Valves BB, DD, HH, and JJ are open, releasing 76 pressure.
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You move to valve GG.
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== Minute 19 ==
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Valves BB, DD, HH, and JJ are open, releasing 76 pressure.
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You move to valve FF.
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== Minute 20 ==
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Valves BB, DD, HH, and JJ are open, releasing 76 pressure.
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You move to valve EE.
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== Minute 21 ==
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Valves BB, DD, HH, and JJ are open, releasing 76 pressure.
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You open valve EE.
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== Minute 22 ==
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Valves BB, DD, EE, HH, and JJ are open, releasing 79 pressure.
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You move to valve DD.
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== Minute 23 ==
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Valves BB, DD, EE, HH, and JJ are open, releasing 79 pressure.
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You move to valve CC.
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== Minute 24 ==
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Valves BB, DD, EE, HH, and JJ are open, releasing 79 pressure.
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You open valve CC.
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== Minute 25 ==
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Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
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== Minute 26 ==
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Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
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== Minute 27 ==
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Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
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== Minute 28 ==
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Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
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== Minute 29 ==
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Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
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== Minute 30 ==
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Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
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This approach lets you release the most pressure possible in 30 minutes with this valve layout, 1651.
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Work out the steps to release the most pressure in 30 minutes. What is the most pressure you can release?
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Your puzzle answer was 1862.
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--- Part Two ---
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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?
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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
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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
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valves yourself, giving you both the same full 26 minutes.)
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In the example above, you could teach the elephant to help you as follows:
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== Minute 1 ==
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No valves are open.
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You move to valve II.
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The elephant moves to valve DD.
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== Minute 2 ==
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No valves are open.
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You move to valve JJ.
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The elephant opens valve DD.
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== Minute 3 ==
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Valve DD is open, releasing 20 pressure.
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You open valve JJ.
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The elephant moves to valve EE.
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== Minute 4 ==
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Valves DD and JJ are open, releasing 41 pressure.
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You move to valve II.
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The elephant moves to valve FF.
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== Minute 5 ==
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Valves DD and JJ are open, releasing 41 pressure.
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You move to valve AA.
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The elephant moves to valve GG.
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== Minute 6 ==
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Valves DD and JJ are open, releasing 41 pressure.
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You move to valve BB.
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The elephant moves to valve HH.
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== Minute 7 ==
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Valves DD and JJ are open, releasing 41 pressure.
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You open valve BB.
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The elephant opens valve HH.
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== Minute 8 ==
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Valves BB, DD, HH, and JJ are open, releasing 76 pressure.
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You move to valve CC.
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The elephant moves to valve GG.
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== Minute 9 ==
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Valves BB, DD, HH, and JJ are open, releasing 76 pressure.
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You open valve CC.
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The elephant moves to valve FF.
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== Minute 10 ==
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Valves BB, CC, DD, HH, and JJ are open, releasing 78 pressure.
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The elephant moves to valve EE.
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== Minute 11 ==
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Valves BB, CC, DD, HH, and JJ are open, releasing 78 pressure.
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The elephant opens valve EE.
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(At this point, all valves are open.)
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== Minute 12 ==
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Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
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...
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== Minute 20 ==
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Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
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...
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== Minute 26 ==
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Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
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With the elephant helping, after 26 minutes, the best you could do would release a total of 1707 pressure.
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With you and an elephant working together for 26 minutes, what is the most pressure you could release?
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Your puzzle answer was 2422.
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Both parts of this puzzle are complete! They provide two gold stars: **
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References
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