43 lines
1.5 KiB
Plaintext
43 lines
1.5 KiB
Plaintext
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--- Part Two ---
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The engineer finds the missing part and installs it in the engine! As the engine
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springs to life, you jump in the closest gondola, finally ready to ascend to the
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water source.
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You don't seem to be going very fast, though. Maybe something is still wrong?
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Fortunately, the gondola has a phone labeled "help", so you pick it up and the
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engineer answers.
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Before you can explain the situation, she suggests that you look out the window.
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There stands the engineer, holding a phone in one hand and waving with the
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other. You're going so slowly that you haven't even left the station. You exit
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the gondola.
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The missing part wasn't the only issue - one of the gears in the engine is
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wrong. A gear is any * symbol that is adjacent to exactly two part numbers. Its
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gear ratio is the result of multiplying those two numbers together.
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This time, you need to find the gear ratio of every gear and add them all up so
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that the engineer can figure out which gear needs to be replaced.
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Consider the same engine schematic again:
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467..114..
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...*......
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..35..633.
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......#...
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617*......
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.....+.58.
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..592.....
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......755.
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...$.*....
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.664.598..
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In this schematic, there are two gears. The first is in the top left; it has
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part numbers 467 and 35, so its gear ratio is 16345. The second gear is in the
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lower right; its gear ratio is 451490. (The * adjacent to 617 is not a gear
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because it is only adjacent to one part number.) Adding up all of the gear
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ratios produces 467835.
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What is the sum of all of the gear ratios in your engine schematic?
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