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2025/day03/problem

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+Advent of Code
+
+br0xen [7](AoC++) 6*
+
+--- Day 3: Lobby ---
+
+   You descend a short staircase, enter the surprisingly vast lobby, and are
+   quickly cleared by the security checkpoint. When you get to the main
+   elevators, however, you discover that each one has a red light above it:
+   they're all offline.
+
+   "Sorry about that," an Elf apologizes as she tinkers with a nearby control
+   panel. "Some kind of electrical surge seems to have fried them. I'll try
+   to get them online soon."
+
+   You explain your need to get further underground. "Well, you could at
+   least take the escalator down to the printing department, not that you'd
+   get much further than that without the elevators working. That is, you
+   could if the escalator weren't also offline."
+
+   "But, don't worry! It's not fried; it just needs power. Maybe you can get
+   it running while I keep working on the elevators."
+
+   There are batteries nearby that can supply emergency power to the
+   escalator for just such an occasion. The batteries are each labeled with
+   their [16]joltage rating, a value from 1 to 9. You make a note of their
+   joltage ratings (your puzzle input). For example:
+
+ 987654321111111
+ 811111111111119
+ 234234234234278
+ 818181911112111
+
+   The batteries are arranged into banks; each line of digits in your input
+   corresponds to a single bank of batteries. Within each bank, you need to
+   turn on exactly two batteries; the joltage that the bank produces is equal
+   to the number formed by the digits on the batteries you've turned on. For
+   example, if you have a bank like 12345 and you turn on batteries 2 and 4,
+   the bank would produce 24 jolts. (You cannot rearrange batteries.)
+
+   You'll need to find the largest possible joltage each bank can produce. In
+   the above example:
+
+     • In 987654321111111, you can make the largest joltage possible, 98, by
+       turning on the first two batteries.
+     • In 811111111111119, you can make the largest joltage possible by
+       turning on the batteries labeled 8 and 9, producing 89 jolts.
+     • In 234234234234278, you can make 78 by turning on the last two
+       batteries (marked 7 and 8).
+     • In 818181911112111, the largest joltage you can produce is 92.
+
+   The total output joltage is the sum of the maximum joltage from each bank,
+   so in this example, the total output joltage is 98 + 89 + 78 + 92 = 357.
+
+   There are many batteries in front of you. Find the maximum joltage
+   possible from each bank; what is the total output joltage?
+
+   Your puzzle answer was 17113.
+
+--- Part Two ---
+
+   The escalator doesn't move. The Elf explains that it probably needs more
+   joltage to overcome the [17]static friction of the system and hits the big
+   red "joltage limit safety override" button. You lose count of the number
+   of times she needs to confirm "yes, I'm sure" and decorate the lobby a bit
+   while you wait.
+
+   Now, you need to make the largest joltage by turning on exactly twelve
+   batteries within each bank.
+
+   The joltage output for the bank is still the number formed by the digits
+   of the batteries you've turned on; the only difference is that now there
+   will be 12 digits in each bank's joltage output instead of two.
+
+   Consider again the example from before:
+
+ 987654321111111
+ 811111111111119
+ 234234234234278
+ 818181911112111
+
+   Now, the joltages are much larger:
+
+     • In 987654321111111, the largest joltage can be found by turning on
+       everything except some 1s at the end to produce 987654321111.
+     • In the digit sequence 811111111111119, the largest joltage can be
+       found by turning on everything except some 1s, producing 811111111119.
+     • In 234234234234278, the largest joltage can be found by turning on
+       everything except a 2 battery, a 3 battery, and another 2 battery near
+       the start to produce 434234234278.
+     • In 818181911112111, the joltage 888911112111 is produced by turning on
+       everything except some 1s near the front.
+
+   The total output joltage is now much larger: 987654321111 + 811111111119 +
+   434234234278 + 888911112111 = 3121910778619.
+
+   What is the new total output joltage?
+
+   Your puzzle answer was 169709990062889.
+
+   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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+   7. Advent of Code Supporter
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+  10. https://adventofcode.com/2025/support
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+  16. https://adventofcode.com/2020/day/10
+  17. https://en.wikipedia.org/wiki/Static_friction
+  18. https://adventofcode.com/2025
+  19. https://adventofcode.com/2025/day/3/input
+  22. javascript:void(0);