Added skip function for faster exit. Part 2 still broken

2024/day-9/solution-2.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-FILE=input
+FILE=$1
 # Sparse sequence
 read -r -a SPARSE_ARRAY <<< "$(
   INDEX=0
@@ -15,13 +15,13 @@ read -r -a SPARSE_ARRAY <<< "$(
     else
       for (( i=1; i<=CHAR; i++ ))
       do
-        printf ". "
+        printf "%s " '-1'
       done
     fi
     (( INDEX++ ))
   done <<< "$( sed -E 's/(.)/\1\n/g' "$FILE" | grep -v '^$' )"
 )"
-printf "%s" "${SPARSE_ARRAY[@]}"
+printf "%s" "${SPARSE_ARRAY[@]}" | fold -w 100
 printf "\n"
 printf "Sparse array len: %s\n" "${#SPARSE_ARRAY[@]}"
 SHADOW_ARRAY=( "${SPARSE_ARRAY[@]}" )
@@ -29,72 +29,87 @@ SHADOW_ARRAY=( "${SPARSE_ARRAY[@]}" )
 # Start by working backwards
 j=$(( ${#SPARSE_ARRAY[@]} - 1 )) # Moveable index since file blocks jump
 k=0 # SHADOW_ARRAY cursor
+LAST_SKIP=9999
 while [[ $j -ge 0 ]]
 do
-  if [[ ${SPARSE_ARRAY[j]} != '.' ]] 
+  # Find a file
+  if [[ ${SPARSE_ARRAY[j]} -eq -1 ]] 
   then
-
+    # Not a file
-    # Get file size
-    FILE_SIZE=0
-    ID=${SPARSE_ARRAY[j]}
-    while [[ ${SPARSE_ARRAY[j]} == "$ID" ]]
-    do
-      (( FILE_SIZE++ ))
-      (( j-- ))
-    done
-    printf "File ID: %s, File size: %s\n" "$ID" "$FILE_SIZE" 2>&1
-
-    # Search for available contiguous space
-    # Search from start until the file itself
-    k=0
-    while [[ $k -lt $(( j - FILE_SIZE )) ]] 
-    do
-      CONT_SPACE=0
-
-      # Skip ahead until first match of space
-      while [[ ${SHADOW_ARRAY[k]} != "." ]]
-      do
-        (( k++ ))
-      done
-
-      # Space found, now get contiguous length
-      while [[ ${SHADOW_ARRAY[k]} == '.' ]]
-      do
-        (( CONT_SPACE++ ))
-        (( k++ ))
-      done
-      
-      # Space length is ok, can proceed
-      if [[ $FILE_SIZE -le $CONT_SPACE ]] ;then break; fi
-    done
-
-    # Can proceed
-    if [[ $FILE_SIZE -le $CONT_SPACE ]]
-    then
-      # Move the file to the contiguous space
-      (( k-= CONT_SPACE ))
-      while [[ $FILE_SIZE -gt 0 ]]
-      do
-        SHADOW_ARRAY[k]=$ID
-        SHADOW_ARRAY[j+FILE_SIZE]='.'
-	(( k++ ))
-        (( FILE_SIZE-- ))
-      done
-    else
-      # Skip the file
-      continue
-    fi
-  else
     (( j-- ))
+    continue
+  fi
+
+  # Get file size
+  # j moved to index before file head
+  FILE_SIZE=0
+  ID=${SPARSE_ARRAY[j]}
+  while [[ ${SPARSE_ARRAY[j]} == "$ID" ]]
+  do
+    (( FILE_SIZE++ ))
+    (( j-- ))
+  done
+  #printf "File ID: %s, File size: %s\n" "$ID" "$FILE_SIZE" 2>&1
+
+  # Since search space is constantly decreasing
+  # Contiguous space can only keep getting smaller 
+  if [[ $FILE_SIZE -ge $LAST_SKIP ]]
+  then
+    printf "File %s size %s skipped. Last skip: %s\n" "$ID" "$FILE_SIZE" "$LAST_SKIP"
+    continue
+  fi
+
+  # Search for available contiguous space
+  # Search from start until the file itself
+  k=0
+  while [[ $k -le $j ]]  && [[ $k -le ${#SHADOW_ARRAY[@]} ]]
+  do
+    CONT_SPACE=0
+
+    # Skip ahead until first match of space
+    while [[ ${SHADOW_ARRAY[k]} -ne -1 ]] && [[ $k -le ${#SHADOW_ARRAY[@]} ]]
+    do
+      (( k++ ))
+    done
+
+    # Space found, now get contiguous length
+    while [[ ${SHADOW_ARRAY[k]} -eq -1 ]] && [[ $k -le ${#SHADOW_ARRAY[@]} ]]
+    do
+      (( CONT_SPACE++ ))
+      (( k++ ))
+    done
+    
+    # Space length is ok, can proceed
+    if [[ $FILE_SIZE -le $CONT_SPACE ]] ;then break; fi
+  done
+
+  # Space length ok, can proceed
+  if [[ $FILE_SIZE -le $CONT_SPACE ]]
+  then
+    # Move the file to head of contiguous space
+    (( k-= CONT_SPACE ))
+    while [[ $FILE_SIZE -gt 0 ]] && \
+          [[ ${SHADOW_ARRAY[k]} -eq -1 ]] && \
+          [[ ${SHADOW_ARRAY[j+FILE_SIZE]} -ne -1 ]]
+    do
+      SHADOW_ARRAY[k]=$ID
+      SHADOW_ARRAY[j+FILE_SIZE]=-1
+      (( k++ ))
+      (( FILE_SIZE-- ))
+    done
+  else
+    LAST_SKIP=$FILE_SIZE
+    printf "File %s skipped. File size: %s\n" "$ID" "$FILE_SIZE"
+    continue
   fi
 done
-printf "%s" "${SHADOW_ARRAY[@]}"
+printf "%s " "${SHADOW_ARRAY[@]}" | fold -w 100 | tee final-result | cat
 printf "\n"
 
-# Generate checksum for sparse array
+# Generate checksum for shadow array
 CHECKSUM=0
 for (( i=0; i<${#SHADOW_ARRAY[@]}; i++ ))
 do
-  if [[ ${SHADOW_ARRAY[i]} != "." ]] ;then (( CHECKSUM += i * SHADOW_ARRAY[i] )); fi
+  if [[ ${SHADOW_ARRAY[i]} -ne -1 ]] ;then (( CHECKSUM += i * SHADOW_ARRAY[i] )); fi
 done
-printf "%s" "$CHECKSUM"
+printf "%s\n" "$CHECKSUM"