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25 lines
1.3 KiB
Text
25 lines
1.3 KiB
Text
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--- Day 8: I Heard You Like Registers ---
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You receive a signal directly from the CPU. Because of your recent assistance with jump instructions, it would like you to compute the result of a series of unusual register instructions.
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Each instruction consists of several parts: the register to modify, whether to increase or decrease that register's value, the amount by which to increase or decrease it, and a condition. If the condition fails, skip the instruction without modifying the register. The registers all start at 0. The instructions look like this:
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b inc 5 if a > 1
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a inc 1 if b < 5
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c dec -10 if a >= 1
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c inc -20 if c == 10
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These instructions would be processed as follows:
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Because a starts at 0, it is not greater than 1, and so b is not modified.
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a is increased by 1 (to 1) because b is less than 5 (it is 0).
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c is decreased by -10 (to 10) because a is now greater than or equal to 1 (it is 1).
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c is increased by -20 (to -10) because c is equal to 10.
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After this process, the largest value in any register is 1.
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You might also encounter <= (less than or equal to) or != (not equal to). However, the CPU doesn't have the bandwidth to tell you what all the registers are named, and leaves that to you to determine.
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What is the largest value in any register after completing the instructions in your puzzle input?
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