rename repo, subdir for yearly challenges

2020/day17/ex1-v1.bash

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+#!/bin/bash
+#
+# ex1-v1.bash: Advent2020 game, day 17/game 1.
+# too slow to adapt for task 2. See ex1.bash.
+
+CMD=${0##*/}
+#shopt -s extglob
+
+declare -A life=()
+declare -i x=-1 y=-1 z=-1 res=0
+declare -i maxx maxy maxz
+
+function count_neighbors () {
+	local -i x=$1 y=$2 z=$3 x1 y1 z1 count=0
+	local str=""
+
+
+	for ((x1=x-1; x1<x+2; ++x1)); do
+		for ((y1=y-1; y1<y+2; ++y1)); do
+			for ((z1=z-1; z1<z+2; ++z1)); do
+				if ((x1!=x || y1!=y || z1!=z)); then
+					if [[ ${life[$x1-$y1-$z1]} == "#" ]]; then
+						((count++))
+						str="$str $x1-$y1-$z1"
+					fi
+
+				fi
+			done
+		done
+	done
+	echo "$count"
+}
+
+function run_cycle () {
+	local -i x y z count=0
+	local -A lifetmp=()
+
+	for ((x=0; x<maxx; ++x)); do
+		for ((y=0; y<maxy; ++y)); do
+			for ((z=0; z<maxz; ++z)); do
+				count=$(count_neighbors "$x" "$y" "$z")
+				if [[ ${life[$x-$y-$z]} == "#" ]]; then
+					((count!=2 && count!=3)) && lifetmp[$x-$y-$z]="."
+				else
+					((count==3)) && lifetmp[$x-$y-$z]="#"
+				fi
+			done
+		done
+	done
+	for k in "${!lifetmp[@]}"; do
+		life[$k]=${lifetmp[$k]}
+	done
+}
+
+function count_active () {
+	local k
+	local -i count=0
+
+	for k in "${!life[@]}"; do
+		if [[ ${life[$k]} == "#" ]]; then
+			((count++))
+		fi
+	done
+	echo "$count"
+}
+
+x=6; y=6; z=6
+while read -r line; do
+	if ((y==6)); then							  # 1st line
+		((maxx=6+${#line}+6+1))
+		((maxy=maxx))
+		((maxz=maxx))
+	fi
+	for ((j=0; j<${#line}; ++j)); do
+		((curx=x+j))
+		life[$curx-$y-$z]=${line:j:1}
+	done
+	((y++))
+done
+for ((i=0; i<6; ++i)); do
+	run_cycle
+done
+res=$(count_active)
+
+printf "%s : res=%d\n" "$CMD" "$res"
+
+exit 0