Bash 2022 day 12 (parts 1 & 2), before cleaning code
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2022/day12/aoc.bash
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200
2022/day12/aoc.bash
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#!/usr/bin/env bash
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#
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# aoc.bash: Advent of Code 2022, day 12
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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 map map2
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declare -A height map visited
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declare -i X Y
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declare start end push=push1
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declare -a queue
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printmap() {
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local -i x y
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for (( y = 0; y < Y; ++y )); do
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for (( x = 0; x < X; ++x )); do
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printf "%2d " "${map["$x,$y"]}"
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done
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echo
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done
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}
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printvis() {
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local -i x y
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for (( y = 0; y < Y; ++y )); do
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for (( x = 0; x < X; ++x )); do
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printf "%2d " "${visited["$x,$y"]}"
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done
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echo
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done
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}
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push1() { # push part 1
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local -i _d="$1" _x="$2" _y="$3" _h="$4"
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local _c="$_x,$_y"
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printf "push d=%d x=%d y=%d h=%d nh=%d... " "$_d" "$_x" "$_y" "$_h" \
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"${map[$_c]}"
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if (( !visited[$_c] && map[$_c] <= (_h + 1) )); then
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(( _d++ ))
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visited["$_c"]=$_d
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queue+=("$_d:$_c")
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echo "$_d:$_c" pushed.
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else
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echo not pushed.
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fi
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#local str="$_d:$_x-$_y"
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#queue+=("$1")
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}
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push2() { # push part 2
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local -i _d="$1" _x="$2" _y="$3" _h="$4"
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local _c="$_x,$_y"
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printf "push d=%d x=%d y=%d h=%d nh=%d... " "$_d" "$_x" "$_y" "$_h" \
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"${map[$_c]}"
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if (( !visited[$_c] && map[$_c] >= (_h - 1) )); then
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(( _d++ ))
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visited["$_c"]=$_d
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queue+=("$_d:$_c")
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echo "$_d:$_c" pushed.
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else
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echo not pushed.
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fi
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#local str="$_d:$_x-$_y"
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#queue+=("$1")
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}
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pop() {
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local -n _d="$1" _x="$2" _y="$3"
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local head
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((!${#queue[@]})) && echo pop: queue empty. && return 1
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head="${queue[0]}"
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#echo "Q=${#queue[@]}=${queue[*]} head=$head"
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# shellcheck disable=2034
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printf "pop: %s\t" "$head"
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_d=${head%:*}
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# shellcheck disable=2034
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head=${head#*:}
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_x=${head%,*}
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_y=${head#*,}
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unset 'queue[0]'
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queue=("${queue[@]}")
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printf "pop: d=%d x=%d y=%d remain=%d\n" "$_d" "$_x" "$_y" "${#queue[@]}"
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#echo "Q=${#queue[@]}=${queue[*]} head=$head"
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return 0
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}
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# initialize height values
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init() {
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declare -i i=1
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for c in {a..z}; do
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(( height[$c] = i++ ))
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#echo
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done
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height[S]=1
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height[E]=26
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}
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parse() {
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local -i part="$1"
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local -a _map
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local -i x y
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local c
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((part == 2)) && push=push2
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init
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readarray -t _map
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X=${#_map[0]}
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Y=${#_map[@]}
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echo "X=$X Y=$Y"
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# create array map[x,y]
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for (( y = 0; y < Y; ++y )); do
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for (( x = 0; x < X; ++x )); do
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c=${_map[$y]:x:1}
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# printf "y=%d x=%d c=%s h=%d " "$y" "$x" "$c" "${height[$c]}"
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map["$x,$y"]=${height[$c]}
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# printf "M=%s\n" "${map["$x,$y"]}"
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case "$c" in
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S) start="$x,$y"
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((part == 1)) && $push 0 "$x" "$y" 1
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#printf "\tstart\n"
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;;
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E) end="$x,$y"
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((part == 2)) && $push 0 "$x" "$y" 1
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#printf "\tend\n"
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;;
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esac
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done
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done
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printf "start=%s end=%s\n" "$start" "$end"
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printmap
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}
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solve() {
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#local depth coord
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local -i h d x y
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#push 0 ${start%-*} ${start#*-} 1
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#push "11:46-55"
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while pop d x y; do
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(( h=${map["$x,$y"]} ))
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if [[ $part == 1 ]]; then
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if [[ "$x,$y" == "$end" ]]; then
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res=$((d-1))
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printmap
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echo
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printvis
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return
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fi
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else
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if [[ "${map["$x,$y"]}" == 1 ]]; then
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res=$((d-1))
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printmap
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echo
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printvis
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return
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fi
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fi
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if ((y > 0)); then # north
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$push "$d" "$x" "$((y-1))" "$h"
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fi
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if ((x+1 < X)); then # east
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$push "$d" "$((x+1))" "$y" "$h"
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fi
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if ((y+1 < Y)); then # south
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$push "$d" "$x" "$((y+1))" "$h"
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fi
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if ((x > 0)); then # west
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$push "$d" "$((x-1))" "$y" "$h"
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fi
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#echo "d=$d x=$x y=$y"
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echo
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done
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#push "10:45-54"
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# push "11:46-55"
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# pop dep x y
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# echo "d=$d x=$x y=$y"
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# pop dep x y
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# echo "d=$d x=$x y=$y"
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# push "78:1-2"
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# pop dep x y
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# echo "d=$d x=$x y=$y"
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# #pop d c
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# #echo "d=$d c=$c"
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# :
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# #(( part == 2 )) && (( _loops = 10000, divisor = 1 ))
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}
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main "$@"
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exit 0
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