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day08: replace static foreach with workaround
author Jordi Gutiérrez Hermoso Tue, 16 Jan 2018 11:28:55 -0500 049fb8e56025
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--- Day 8: I Heard You Like Registers ---

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.

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:

b inc 5 if a > 1
a inc 1 if b < 5
c dec -10 if a >= 1
c inc -20 if c == 10

These instructions would be processed as follows:

Because a starts at 0, it is not greater than 1, and so b is not
modified.

a is increased by 1 (to 1) because b is less than 5 (it is 0).

c is decreased by -10 (to 10) because a is now greater than or
equal to 1 (it is 1).

c is increased by -20 (to -10) because c is equal to 10.

After this process, the largest value in any register is 1.

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.

What is the largest value in any register after completing the