AdventOfCode2022/3

Day 3

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Today's language: C

Extra: Task 1 in vimscript, generated by OpenAI with just a few fixes by myself

All the characters (the Elf's items) occuring in (half) a line (backpack) are stored as bits in an unsigned long, duplicate characters can then be determined by bitwise and-ing these numbers.

# Find the item type that appears in both compartments of each rucksack. What is the sum of the priorities of those item types?
gcc main.c -o day3
./day3

# OpenAI vim script
vim rucksack_items.txt
# in vim:
# :source day3-1.vim