75 lines
1.3 KiB
Bash
Executable File
75 lines
1.3 KiB
Bash
Executable File
#!/bin/bash
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#
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# ex1.bash: Advent2020 game, day 17/game 2.
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CMD=${0##*/}
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#shopt -s extglob
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declare -A life=()
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declare -i x=-1 y=-1 z=-1 w=-1 res=0
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declare -i loops=6
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function run_cycle () {
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local -i x y z w x1 y1 z1 w1 v
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local -A lifetmp=()
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local -a values
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for k in "${!life[@]}"; do
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# shellcheck disable=SC2206
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values=(${k//-/ })
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x=${values[0]}
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y=${values[1]}
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z=${values[2]}
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w=${values[3]}
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for ((x1=x-1; x1<x+2; ++x1)); do
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for ((y1=y-1; y1<y+2; ++y1)); do
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for ((z1=z-1; z1<z+2; ++z1)); do
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for ((w1=w-1; w1<w+2; ++w1)); do
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if ((x1!=x || y1!=y || z1!=z || w1!=w)); then
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((++lifetmp[$x1-$y1-$z1-$w1]))
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fi
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done
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done
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done
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done
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done
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# clean elements with no neighbors
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for k in "${!life[@]}"; do
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if [[ ! -v lifetmp[$k] ]]; then
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unset "life[$k]"
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fi
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done
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for k in "${!lifetmp[@]}"; do
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v=${lifetmp[$k]}
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if [[ -v life[$k] ]]; then
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(( v!=2 && v!=3 )) && unset "life[$k]"
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else
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(( v==3 )) && life[$k]="#"
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fi
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done
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}
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x=$loops; y=$loops; z=$loops; w=$loops
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while read -r line; do
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for ((j=0; j<${#line}; ++j)); do
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((curx=x+j))
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c=${line:j:1}
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if [[ $c == "#" ]]; then
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life[$curx-$y-$z-$w]=$c
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fi
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done
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((y++))
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done
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for ((i=0; i<6; ++i)); do
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run_cycle
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done
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res=${#life[@]}
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printf "%s : res=%d\n" "$CMD" "$res"
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exit 0
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