## \-\-- Day 8: I Heard You Like Registers \-\--

You receive a signal
directly from the CPU. Because of your recent assistance with [jump
instructions](5), 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
instructions in your puzzle input?

Your puzzle answer was `4066`.

## \-\-- Part Two \-\-- {#part2}

To be safe, the CPU also needs to know *the highest value held in any
register during this process* so that it can decide how much memory to
allocate to these operations. For example, in the above instructions,
the highest value ever held was `10` (in register `c` after the third
instruction was evaluated).

Your puzzle answer was `4829`.

Both parts of this puzzle are complete! They provide two gold stars:
\*\*

At this point, you should [return to your Advent calendar](/2017) and
try another puzzle.

If you still want to see it, you can [get your puzzle
input](8/input).