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Ruidy (aider) 70b2cf2086
feat: Implement mul() instruction parsing and summation for Day 3
2024-12-03 14:05:02 +01:00
..
day3.ex feat: Implement mul() instruction parsing and summation for Day 3 2024-12-03 14:05:02 +01:00
input.txt feat: Create initial files for Advent of Code 2024 Day 3 solution 2024-12-03 13:52:44 +01:00
README.md docs: Add README for Day 3 Advent of Code 2024 solution 2024-12-03 14:00:51 +01:00

README.md

Day 3: Mull It Over

Problem Description

The North Pole Toboggan Rental Shop's computers are having issues with corrupted memory. The program is trying to multiply numbers but the instructions are jumbled up.

Rules

  • Valid instructions are in the format mul(X,Y) where X and Y are 1-3 digit numbers
  • Example: mul(44,46) multiplies 44 by 46 to get 2024
  • Invalid instructions should be ignored, examples:
    • mul(4*
    • mul(6,9!
    • ?(12,34)
    • mul ( 2 , 4 )

Example

Given the corrupted memory:

xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))

Only these instructions are valid:

  • mul(2,4)
  • mul(5,5)
  • mul(11,8)
  • mul(8,5)
Total = (2*4) + (5*5) + (11*8) + (8*5) = 161

Task

Scan the corrupted memory for valid mul instructions and sum their results.