Use a variable reference for where to store the result, stop putting all results...

diff --git a/day15/memory.sh b/day15/memory.sh
index 4f16b3ba6358d4ba309130f58adc53c138713c5b..a2d954747d57e159c201837ef2cd09d7fd9b063e 100755 (executable)
--- a/day15/memory.sh
+++ b/day15/memory.sh
@@ -12,10 +12,11 @@ read_file() {
 get_answer() {
     local number=$1
     local count=$2
 get_answer() {
     local number=$1
     local count=$2

+    local -n __fn_result=$3

     if [ ${lastseen[$number]+a} ]; then
     if [ ${lastseen[$number]+a} ]; then

-        answers[$count]=$((count-${lastseen[$number]}-1))
+        __fn_result=$((count-${lastseen[$number]}))

     else
     else

-        answers[$count]=0
+        __fn_result=0

     fi
 }
 
     fi
 }
 


@@ -39,40 +40,40 @@ filename="${1:-p1_436.txt}"
 read_file "$filename"
 
 declare -A lastseen
 read_file "$filename"
 
 declare -A lastseen

-declare -a answers

 
 current_answer=-1
 last_answer=-1
 count=0
 
 
 current_answer=-1
 last_answer=-1
 count=0
 

+result=
+

 for number in ${data[@]}; do
     count=$((count+1))
     last_answer=$current_answer
     if [ $last_answer -ge 0 ]; then
         lastseen[$last_answer]=$((count-1))
     fi
 for number in ${data[@]}; do
     count=$((count+1))
     last_answer=$current_answer
     if [ $last_answer -ge 0 ]; then
         lastseen[$last_answer]=$((count-1))
     fi

-    answers[$count]=$number

     current_answer=$number
 done
 
 while [ $count -lt 2020 ]; do
     current_answer=$number
 done
 
 while [ $count -lt 2020 ]; do

-    count=$((count+1))
-    get_answer $current_answer $count

     last_answer=$current_answer
     last_answer=$current_answer

+    get_answer $current_answer $count result
+    count=$((count+1))
+    current_answer=$result

     lastseen[$last_answer]=$((count-1))
     lastseen[$last_answer]=$((count-1))

-    current_answer=${answers[$count]}
-    $debug_func "$count: ${answers[$count]}"
+    $debug_func "$count: $current_answer"

 done
 
 done
 

-echo "Part 1: ${answers[$count]}"
+echo "Part 1: $current_answer"

 
 while [ $count -lt 30000000 ]; do
 
 while [ $count -lt 30000000 ]; do

-    count=$((count+1))
-    get_answer $current_answer $count

     last_answer=$current_answer
     last_answer=$current_answer

+    get_answer $current_answer $count result
+    count=$((count+1))
+    current_answer=$result

     lastseen[$last_answer]=$((count-1))
     lastseen[$last_answer]=$((count-1))

-    current_answer=${answers[$count]}
-    $debug_func "$count: ${answers[$count]}"
+    $debug_func "$count: $current_answer"

 done
 
 done
 

-echo "Part 2: ${answers[$count]}"
+echo "Part 2: $current_answer"