Day 19 Part 1 Working

2024-12-19 17:00:05 +08:00
parent ce0033c6f5
commit fd78069221
6 changed files with 590 additions and 0 deletions
--- a/2024/day-19/solution-2.sh
+++ b/2024/day-19/solution-2.sh
@ -0,0 +1,90 @@
+#!/usr/bin/env bash
+
+TOWEL_FILE=$1
+DESIGN_FILE=$2
+TOWEL_ITER=10
+
+read -r -a TOWELS <<< "$( < "$TOWEL_FILE" tr ',' ' ' | paste -s -d " " )"
+read -r -a DESIGNS <<< "$( < "$DESIGN_FILE" paste -s -d " " )"
+
+#printf "Towel %s\n" "${TOWELS[@]}"
+#printf "Design %s\n" "${DESIGNS[@]}"
+
+# Check if towel is a viable match
+match_towel () {
+  TOWEL=$1
+  MATCH=$2
+  FULL_DESIGN=$3
+
+  TO_MATCH="$MATCH$TOWEL"
+  PARTIAL_DESIGN=${FULL_DESIGN::${#TO_MATCH}}
+  if [[ $PARTIAL_DESIGN == "$TO_MATCH" ]]
+  then
+    return 0
+  else
+    return 1
+  fi
+}
+
+TOTAL_VALID=0
+declare -A UNMATCHED_TOWEL_LIST
+for DESIGN in "${DESIGNS[@]}"
+do
+  printf "Starting design : %s\n" "$DESIGN"
+  declare -A MATCH_LIST
+  # Get all viable starting matches
+  for TOWEL_IDX in "${!TOWELS[@]}"
+  do
+    TOWEL=${TOWELS[$TOWEL_IDX]}
+    #printf "Testing towel: %s\n" "$TOWEL"
+
+    if match_towel "$TOWEL" "" "$DESIGN"
+    then
+      #printf "Starting match found. towel : %s\n" "$TOWEL"
+      # Copy towel list and remove the starting towel
+      read -r -a TOWEL_LIST <<< "$( printf "%s " "${TOWELS[@]}" )"
+      unset "TOWEL_LIST[$TOWEL_IDX]"
+      # Add to combinations
+      MATCH_LIST["$TOWEL"]=$( printf "%s " "${TOWEL_LIST[@]}" )
+      unset "TOWEL_LIST"
+    fi
+  done
+  if [[ ${#MATCH_LIST[@]} -eq 0 ]] ; then printf "No available starting matches.\n" ; continue ; fi
+  # Now iterate over starting matches
+  LOOP_COUNT=${#TOWELS[@]}
+  while [[ $LOOP_COUNT -gt 0 ]]
+  do
+    for TOWEL_MATCH in "${!MATCH_LIST[@]}"
+    do
+      read -r -a TOWEL_LIST <<< "${MATCH_LIST[$TOWEL_MATCH]}"
+      # Iterate over towels and find subsequent match
+      for TOWEL_IDX in "${!TOWEL_LIST[@]}"
+      do
+        TOWEL=${TOWELS[$TOWEL_IDX]}
+        if match_towel "$TOWEL" "$TOWEL_MATCH" "$DESIGN"
+        then
+          #printf "Match found for %s towel : %s\n" "${TOWEL_MATCH}" "$TOWEL"
+          unset "TOWEL_LIST[$TOWEL_IDX]"
+          # Add to combinations
+          MATCH_LIST["$TOWEL_MATCH$TOWEL"]=$( printf "%s " "${TOWEL_LIST[@]}" )
+          unset "MATCH_LIST[$TOWEL_MATCH]"
+        fi
+      done
+    done
+    (( LOOP_COUNT-- ))
+  done
+
+  # Calculate proper matches
+  for MATCH in "${!MATCH_LIST[@]}"
+  do
+    if [[ $MATCH == "$DESIGN" ]]
+    then
+      printf "Match found for design %s\n" "$DESIGN"
+      (( TOTAL_VALID++ ))
+    fi
+  done
+
+  # Remove matches
+  unset MATCH_LIST
+done
+printf "Total valid designs: %s\n" "$TOTAL_VALID"