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Brian Buller
2018-03-15 11:24:23 -05:00
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Advent of Code
br0xen 43*
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Advent of Code
--- Day 23: Opening the Turing Lock ---
Little Jane Marie just got her very first computer for Christmas from some unknown benefactor.
It comes with instructions and an example program, but the computer itself seems to be
malfunctioning. She's curious what the program does, and would like you to help her run it.
Little Jane Marie just got her very first computer for Christmas from some
unknown benefactor. It comes with instructions and an example program, but
the computer itself seems to be malfunctioning. She's curious what the
program does, and would like you to help her run it.
The manual explains that the computer supports two registers and six instructions (truly, it
goes on to remind the reader, a state-of-the-art technology). The registers are named a and b,
can hold any non-negative integer, and begin with a value of 0. The instructions are as
follows:
The manual explains that the computer supports two registers and six
instructions (truly, it goes on to remind the reader, a state-of-the-art
technology). The registers are named a and b, can hold any non-negative
integer, and begin with a value of 0. The instructions are as follows:
• hlf r sets register r to half its current value, then continues with the next instruction.
• tpl r sets register r to triple its current value, then continues with the next
instruction.
• inc r increments register r, adding 1 to it, then continues with the next instruction.
• jmp offset is a jump; it continues with the instruction offset away relative to itself.
• jie r, offset is like jmp, but only jumps if register r is even ("jump if even").
• jio r, offset is like jmp, but only jumps if register r is 1 ("jump if one", not odd).
• hlf r sets register r to half its current value, then continues with the
next instruction.
All three jump instructions work with an offset relative to that instruction. The offset is
always written with a prefix + or - to indicate the direction of the jump (forward or
backward, respectively). For example, jmp +1 would simply continue with the next instruction,
while jmp +0 would continuously jump back to itself forever.
• tpl r sets register r to triple its current value, then continues with
the next instruction.
The program exits when it tries to run an instruction beyond the ones defined.
• inc r increments register r, adding 1 to it, then continues with the
next instruction.
For example, this program sets a to 2, because the jio instruction causes it to skip the tpl
instruction:
• jmp offset is a jump; it continues with the instruction offset away
relative to itself.
• jie r, offset is like jmp, but only jumps if register r is even ("jump
if even").
• jio r, offset is like jmp, but only jumps if register r is 1 ("jump if
one", not odd).
All three jump instructions work with an offset relative to that
instruction. The offset is always written with a prefix + or - to indicate
the direction of the jump (forward or backward, respectively). For example,
jmp +1 would simply continue with the next instruction, while jmp +0 would
continuously jump back to itself forever.
The program exits when it tries to run an instruction beyond the ones
defined.
For example, this program sets a to 2, because the jio instruction causes it
to skip the tpl instruction:
inc a
jio a, +2
tpl a
inc a
What is the value in register b when the program in your puzzle input is finished executing?
What is the value in register b when the program in your puzzle input is
finished executing?
Your puzzle answer was 255.
@@ -50,15 +56,14 @@
--- Part Two ---
The unknown benefactor is very thankful for releasi-- er, helping little Jane Marie with her
computer. Definitely not to distract you, what is the value in register b after the program is
finished executing if register a starts as 1 instead?
The unknown benefactor is very thankful for releasi-- er, helping little
Jane Marie with her computer. Definitely not to distract you, what is the
value in register b after the program is finished executing if register a
starts as 1 instead?
Although it hasn't changed, you can still get your puzzle input.
Answer: _____________________ [ [Submit] ]
You can also [Shareon Twitter Google+ Reddit] this puzzle.
Answer: 334
References
@@ -73,6 +78,3 @@ References
. https://en.wikipedia.org/wiki/Instruction_set
. https://en.wikipedia.org/wiki/Natural_number
. http://adventofcode.com/day/23/input
. https://twitter.com/intent/tweet?text=I%27ve+completed+Part+One+of+%22Opening+the+Turing+Lock%22+%2D+Day+23+%2D+Advent+of+Code&url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F23&related=ericwastl&hashtags=AdventOfCode
. https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F23
. http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F23&title=I%27ve+completed+Part+One+of+%22Opening+the+Turing+Lock%22+%2D+Day+23+%2D+Advent+of+Code