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Anders Englöf Ytterström 90d5ab203d Solve 2022 day 7 pt 1-2 
Funny that I did not mention the problem with
recurring directory names in the first run of this
puzzle in Elixir, back in 2022 and bb708a5e58.

Most likely, the insight flew over my head that
time.

This time, I realized I could just add the size to
the size of each parent. I struggled to find a graph
traversal for it, until I realized I did not need
the graph.

The key rewrite was this:

    for p in path:
        fs[p] += size
    fs["/"] += size

... to this:

    p = "/"
    fs[p] += size
    for dir_name in path:
        p += f"/{dir_name}"
        fs[p] += size

This solved my issues for 3 hours by acknowledge that

- a directory name "a" can accour on multiple places,
  example: /a, /b/a, /c/a
- a directory name "a" can have a parent directory named
  "a", example: /a/b/a, /a/c/d/a

And as always, example input is the devil. Look at
the reak input as soon as possible.
2025-11-30 19:17:15 +01:00
..
output Solve 2022 day 7 pt 1-2 2025-11-30 19:17:15 +01:00
aoc.py Inititate AOC 2022 in python 2025-11-30 19:17:15 +01:00
README.md Inititate AOC 2022 in python 2025-11-30 19:17:15 +01:00

README.md

Advent of Code 2022

Solutions for #aoc2022 in Python 3 (3.13.4).

Programming setup:

  • Lenovo Thinkpad T14
  • OpenSUSE Tumbleweed with labwc
  • Helix editor
  • Vivaldi
  • Foot

Help scripts

Display all solved puzzles:

python aoc.py

To bootstrap a new puzzle (creates input/<day_no>.txt and output/day_<day_no>.py):

python aoc.py <day_no> new

Manually copy the puzzle input from https://adventofcode.com and paste it in input/<day_no>.txt to start coding.

wl-paste > input/<day_no>.txt

Solve separate puzzle (replace XX with the puzzle number):

python -m output.day_XX

Solve separate puzzle using stdin (replace XX with the puzzle number):

wl-paste | python -m output.day_XX
cat tmpfile | python -m output.day_XX

Execute separate puzzle on file save (replace XX with the puzzle number):

ls output/*.py | entr -c -s 'wlpaste | python -m output.day_XX'
ls output/*.py | entr -c -s 'cat tmpfile | python -m output.day_XX'
ls output/*.py | entr -c -r python -m output.day_XX

(requires entr and wl-paste, Mac users can instead use pbpaste. If you prefer X at Linux, use xclip -selection clipboard -o).

To lint files:

ls output/*.py | entr -r -c flake8 output --ignore=E741,E501,E203