2022 day 7: Bash parts 1 and 2 (messy, tons of debug)
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@@ -118,10 +118,39 @@ files more than once!)
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Find all of the directories with a total size of at most 100000. /What
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is the sum of the total sizes of those directories?/
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To begin, [[file:7/input][get your puzzle input]].
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Your puzzle answer was =1390824=.
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Answer:
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** --- Part Two ---
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Now, you're ready to choose a directory to delete.
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You can also [Shareon
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[[https://twitter.com/intent/tweet?text=%22No+Space+Left+On+Device%22+%2D+Day+7+%2D+Advent+of+Code+2022&url=https%3A%2F%2Fadventofcode%2Ecom%2F2022%2Fday%2F7&related=ericwastl&hashtags=AdventOfCode][Twitter]]
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[[javascript:void(0);][Mastodon]]] this puzzle.
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The total disk space available to the filesystem is =70000000=. To run
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the update, you need unused space of at least =30000000=. You need to
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find a directory you can delete that will /free up enough space/ to run
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the update.
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In the example above, the total size of the outermost directory (and
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thus the total amount of used space) is =48381165=; this means that the
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size of the /unused/ space must currently be =21618835=, which isn't
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quite the =30000000= required by the update. Therefore, the update still
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requires a directory with total size of at least =8381165= to be deleted
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before it can run.
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To achieve this, you have the following options:
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- Delete directory =e=, which would increase unused space by =584=.
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- Delete directory =a=, which would increase unused space by =94853=.
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- Delete directory =d=, which would increase unused space by =24933642=.
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- Delete directory =/=, which would increase unused space by =48381165=.
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Directories =e= and =a= are both too small; deleting them would not free
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up enough space. However, directories =d= and =/= are both big enough!
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Between these, choose the /smallest/: =d=, increasing unused space by
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=24933642=.
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Find the smallest directory that, if deleted, would free up enough space
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on the filesystem to run the update. /What is the total size of that
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directory?/
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Your puzzle answer was =7490863=.
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Both parts of this puzzle are complete! They provide two gold stars: **
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139
2022/day07/aoc.bash
Executable file
139
2022/day07/aoc.bash
Executable file
@@ -0,0 +1,139 @@
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#!/usr/bin/env bash
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#
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# aoc.bash: Advent of Code 2022, day 7
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#
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# Copyright (C) 2022 Bruno Raoult ("br")
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# Licensed under the GNU General Public License v3.0 or later.
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# Some rights reserved. See COPYING.
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#
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# You should have received a copy of the GNU General Public License along with this
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# program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
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#
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# SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
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. common.bash
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declare -A files=() # list of files in dir
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declare -A sizes=() # file size
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declare -A dirs=() # directories
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declare -a lines # shell lines
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declare -i curline=0 # current line in shell
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declare curdir
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print_sizes() {
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local idx
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echo +++++++++++++++++++
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for idx in "${!sizes[@]}"; do
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printf "size(%s)=%d\n" "$idx" "${sizes[$idx]}"
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done
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echo +++++++++++++++++++
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}
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do_cd() {
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local dir="$1"
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echo ">>> $curline ${lines[$curline]}"
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case "$dir" in
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"..")
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echo ".. before: $curdir"
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curdir=${curdir%/*}
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[[ -z $curdir ]] && curdir="/"
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echo ".. after: $curdir"
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;;
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"/")
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curdir="/"
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;;
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*)
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[[ $curdir != "/" ]] && curdir+="/"
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curdir+="$dir"
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esac
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dirs[$curdir]="$curdir"
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echo "> CD $dir newdir=$curdir"
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}
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do_ls() {
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local info file subdir remain
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echo ">>> $curline ${lines[$curline]}"
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((curline++))
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while [[ $curline -lt ${#lines[@]} && ${lines[$curline]:0:1} != "\$" ]]; do
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read -r info file <<< "${lines[$curline]}"
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files[$curdir]+="$file"
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if [[ $info != dir ]]; then # file
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remain="$curdir/$file"
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remain=${remain//+(\/)/\/}
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#sizes[$fullname]=$info
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# recurse up curdir and adjust sizes
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#subdir=${curdir}
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echo "info=$info [$remain]"
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while [[ -n $remain ]]; do
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echo "remain=$remain subdir=$subdir"
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((sizes[$remain] += info))
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remain=${remain%/*}
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subdir=${remain##*/}
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echo " -> remain=$remain subdir=$subdir"
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done
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(( sizes["/"] += info ))
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fi
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echo "ls: ${lines[$curline]}"
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((curline++))
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done
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((curline--))
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print_sizes
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}
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parse() {
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readarray -t lines
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curline=0
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declare -a line
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while ((curline < ${#lines[@]})); do
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read -ra line <<< "${lines[$curline]}"
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if [[ "${line[0]}" != "\$" ]]; then
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printf "ERROR line %d = %s\n" "$curline" "${lines[$curline]}"
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exit 1
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fi
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case "${line[1]}" in
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"cd")
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do_cd "${line[2]}"
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;;
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"ls")
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do_ls
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;;
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esac
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((curline++))
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printf "WARNING curline=%d\n lines=%d\n" "$curline" "${#lines[@]}"
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done
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}
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solve() {
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declare -ig res
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local part="$1" dir mindir="/"
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local -i needed
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if ((part == 1)); then
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for dir in "${dirs[@]}"; do
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printf "size(%s)=%d\n" "$dir" "${sizes[$dir]}"
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if ((sizes[$dir] <= 100000 )); then
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((res+=sizes[$dir]))
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fi
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done
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else
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(( needed = sizes["/"] - (70000000-30000000) ))
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printf "remain=%d\n" "$needed"
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((res = sizes["/"]))
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for dir in "${!dirs[@]}"; do
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#printf "size(%s)=%d\n" "$dir" "${sizes[$dir]}"
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if (( sizes[$dir] >= needed )); then
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printf "dir %s (%d) will free enough res=%d\n" "$dir" "${sizes[$dir]}" "$res"
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if (( sizes[$dir] <= res )); then
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mindir=$dir
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((res = sizes[$mindir]))
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printf "new mindir=%s (%d)\n" "$mindir" "$res"
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fi
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fi
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done
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fi
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}
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main "$@"
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exit 0
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