Day 8 Part 1 Not Working

2024/day-8/solution-1.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+
+FILE=input
+LEN=$( head -1 "$FILE" | sed -E 's/(.)/\1\ /g' | awk '{printf NF}' )
+
+read -r -a MAP_ARRAY <<< "$( < "$FILE" sed -E 's/(.)/\1\ /g' | paste -s -d ' ' )"
+read -r -a SHADOW_ARRAY <<< "$( < "$FILE" sed -E 's/(.)/\1\ /g' | paste -s -d ' ' )"
+#printf "MAP_LEN: %s, NF: %s\n" "${#MAP_ARRAY[@]}" "$LEN" >&2
+
+for CHAR in $( < "$FILE" grep -Eo '[^\.]' | sort -u | paste -s -d' ' )
+do
+  # Get indices for antennae
+  LINE="$( 
+    for (( i=0; i<${#MAP_ARRAY[@]}; i++ ))
+    do
+      if [[ ${MAP_ARRAY[i]} == "$CHAR" ]]
+      then
+        printf "%s " "$i"
+      fi
+    done
+  )"
+  printf "%s\n" "$LINE" >&2
+  read -r -a IDX_ARRAY <<< "$LINE"
+  #printf "idx:  %s " "${IDX_ARRAY[@]}" >&2
+  #printf "\n" >&2
+
+  # Get all combinations
+  for (( i=0; i<${#IDX_ARRAY[@]}-1; i++ ))
+  do
+    A=${IDX_ARRAY[i]}
+    for (( j=i+1; j<${#IDX_ARRAY[@]}; j++ ))
+    do
+      B=${IDX_ARRAY[j]}
+      DIFF=$(( B - A ))
+      HEAD=$(( A - DIFF ))
+      TAIL=$(( B + DIFF ))
+      printf "char: %s, i: %s, j: %s, DIFF: %s, HEAD: %s, TAIL: %s\n"  "$CHAR" "$A" "$B" "$DIFF" "$HEAD" "$TAIL" >&2
+      for VALUE in $HEAD $TAIL
+      do
+        if [[ $VALUE -gt ${#MAP_ARRAY[@]} ]] || [[ $VALUE -lt 0 ]]
+	then
+          continue
+	fi
+	SHADOW_ARRAY[VALUE]=X # Mark on shadow map
+      done
+    done
+  done
+  unset IDX_ARRAY
+
+done
+COUNT=0
+for (( i=0; i<${#SHADOW_ARRAY[@]}; i++ ))
+do
+  if [[ ${SHADOW_ARRAY[i]} == "X" ]]
+  then
+    (( COUNT++ ))
+  fi
+done
+printf "%s\n" "$COUNT"
+printf "%s" "${SHADOW_ARRAY[@]}" | fold -w "$LEN" | sed -E 's/(.)/\1\ /g'