Massive speed up with correct summation calculation

2024/day-11/solution-2-2.sh

@@ -46,9 +46,9 @@ printf "Cache built. KV size: %s \n" "$( wc -l kv-cache )"
 
 # Load cache file
 declare -A KV_CACHE
-while read -r LINE
+while read -r KEY VALUE
 do
-  KV_CACHE[${LINE%% *}]="${LINE#* }"
+  KV_CACHE[$KEY]="$VALUE"
 done < kv-cache
 
 # Use this function for cache misses
@@ -69,9 +69,8 @@ get_num () {
   if [[ $(( DIGIT_COUNT % 2 )) -eq 0 ]]
   then
     HALF=$(( DIGIT_COUNT / 2 ))
-    VALUE=( "$(( 10#${NUM:0:$HALF} ))" "$(( 10#${NUM:$HALF} ))" )
-    printf "%s %s \n" "$OCCUR" "${VALUE[0]}"
-    printf "%s %s \n" "$OCCUR" "${VALUE[1]}"
+    printf "%s %s \n" "$OCCUR" "$(( 10#${NUM:0:$HALF} ))"
+    printf "%s %s \n" "$OCCUR" "$(( 10#${NUM:$HALF} ))"
     return
   fi
 
@@ -98,11 +97,10 @@ do
       get_num "$NUM"
     fi
   done < temp-input |
-  grep -E '[0-9]*' | 
   tee temp-output |
-  sort |
+  sort -n |
   uniq -c |
-  awk '{print ($1 * $2) " " $3}' |
+  awk '{sums[$3] += $1 * $2 } END {for (i in sums) {print sums[i], i}}' |
   sponge temp-input
 done
 printf "Final count: %s\n" "$( awk '{print $1}' < temp-input | paste -s -d "+" | bc )"