Note
Input link: https://adventofcode.com/2024/day/3/input
Note
Problem link: https://adventofcode.com/2024/day/3
The computer appears to be trying to run a program, but its memory (your puzzle input) is corrupted. All of the instructions have been jumbled up!
It seems like the goal of the program is just to multiply some numbers. It does that with
instructions like mul(X,Y), where X and Y are each 1-3 digit numbers. For instance, mul(44,46)
multiplies 44 by 46 to get a result of 2024. Similarly, mul(123,4) would multiply 123 by 4.
However, because the program's memory has been corrupted, there are also many invalid characters
that should be ignored, even if they look like part of a mul instruction. Sequences like
mul(4*, mul(6,9!, ?(12,34), or mul ( 2 , 4 ) do nothing.
Scan the corrupted memory for uncorrupted mul instructions. What do you get if you add up all of the results of the multiplications?
$ cargo run --release -- --input 2024/day03/input.txt 2024 03 part1
170068701Note
Problem link: https://adventofcode.com/2024/day/3#part2
There are two new instructions you'll need to handle:
- The
do()instruction enables future mul instructions. - The
don't()instruction disables future mul instructions.
Only the most recent do() or don't() instruction applies. At the beginning of the program, mul
instructions are enabled.
Handle the new instructions; what do you get if you add up all of the results of just the enabled multiplications?
$ cargo run --release -- --input 2024/day03/input.txt 2024 03 part2
78683433