Day 17 part 2, bash version (and retrofit to part 1)

day17/ex1.bash

@@ -7,18 +7,22 @@ CMD=${0##*/}
 
 declare -A life=()
 declare -i x=-1 y=-1 z=-1 res=0
-declare -i maxx maxy maxz
+declare -i max
+declare -i loops=6
 
 function print_life() {
 	local -i x=0 y=0 z=0 foundx foundy
-	for ((z=0; z<maxz; ++z)); do
+	for ((z=0; z<max; ++z)); do
 		foundy=1
-		for ((y=0; y<maxy; ++y)); do
+		for ((y=0; y<max; ++y)); do
 			foundx=1
-			for ((x=0; x<maxx; ++x)); do
-				if [[ -v life[$x-$y-$z] ]]; then
+			for ((x=0; x<max; ++x)); do
+				if [[ -v life["$x-$y-$z"] ]]; then
 					#printf "%d-%d-%d:" $x $y $z
-					printf "%c" ${life["$x-$y-$z"]}
+					if [[ ${life[$x-$y-$z]} != "#" ]]; then
+					   printf "error"
+					fi
+					printf "%c" "${life[$x-$y-$z]}"
 					foundx=1
 				else
 					printf "%c" "."
@@ -31,46 +35,43 @@ function print_life() {
 
 }
 
-function count_neighbors () {
-	local -i x=$1 y=$2 z=$3 x1 y1 z1 count=0
-	local str=""
+function run_cycle () {
+	local -i x y z count=0 x1 y1 z1 v
+	local -A lifetmp=()
+	local -a values
 
 
-	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-$z1"
+	for k in "${!life[@]}"; do
+		values=(${k//-/ })
+		x=${values[0]}
+		y=${values[1]}
+		z=${values[2]}
+
+		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
+						((++lifetmp[$x1-$y1-$z1]))
 					fi
-
-				fi
+				done
 			done
 		done
 	done
-	#((count)) && printf "neighbours (%d, %d, %d)=%s\n" "$x" "$y" "$z" "$str" >&2
-	echo "$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
+	# clean elements with no neighbors
+	for k in "${!life[@]}"; do
+		if [[ ! -v lifetmp[$k] ]]; then
+			unset "life[$k]"
+		fi
 	done
 	for k in "${!lifetmp[@]}"; do
-		life[$k]=${lifetmp[$k]}
+		v=${lifetmp[$k]}
+
+		if [[ -v life[$k] ]]; then
+			(( v!=2 && v!=3 )) && unset "life[$k]"
+		else
+			(( v==3 )) && life[$k]="#"
+		fi
 	done
 }
 
@@ -86,23 +87,26 @@ function count_active () {
 	echo "$count"
 }
 
-x=6; y=6; z=6
+x=$loops; y=$loops; z=$loops
+
 while read -r line; do
-	if ((y==6)); then							  # 1st line
-		((maxx=6+${#line}+6+1))
-		((maxy=maxx))
-		((maxz=maxx))
+	if ((y==loops)); then						  # 1st line
+		((max=loops+${#line}+loops+1))
 	fi
 	for ((j=0; j<${#line}; ++j)); do
 		((curx=x+j))
-		life[$curx-$y-$z]=${line:j:1}
+		c=${line:j:1}
+		if [[ $c == "#" ]]; then
+			life[$curx-$y-$z]=$c
+		fi
 	done
 	((y++))
 done
 for ((i=0; i<6; ++i)); do
 	run_cycle
 done
-res=$(count_active)
+#echo "================================="
+res=${#life[@]}
 
 printf "%s : res=%d\n" "$CMD" "$res"