Working part 2

2024/day-15/solution-2.sh

@@ -0,0 +1,250 @@
+#!/usr/bin/env bash
+
+FUNCNEST=99999
+MAP_FILE=input-map
+DIRECTIONS_FILE=input-movements
+MAP_WIDTH=$(( ( $( head -1 "$MAP_FILE" | wc -c ) -1 ) * 2 ))
+
+# Move the robot
+move_robot() {
+  MAP_ARRAY[ROBOT_POSITION]=.
+  ROBOT_POSITION=$NEXT_POSITION
+  MAP_ARRAY[ROBOT_POSITION]=@
+}
+
+# Function to move box in n direction
+vertical_move_box () {
+  local BOX_COORDINATE=$1
+  local BOX_MOVE_DIRECTION=$2
+
+  # Normalise coordinates
+  if [[ ${MAP_ARRAY[$BOX_COORDINATE]} == "[" ]]
+  then
+    local L_SIDE=$BOX_COORDINATE
+    local R_SIDE=$(( BOX_COORDINATE +1 ))
+  elif [[ ${MAP_ARRAY[$BOX_COORDINATE]} == "]" ]]
+  then
+    local L_SIDE=$(( BOX_COORDINATE -1 ))
+    local R_SIDE=$BOX_COORDINATE
+  fi
+  local L_SIDE_MOVE_COORDINATE=$(( L_SIDE + BOX_MOVE_DIRECTION ))
+  local R_SIDE_MOVE_COORDINATE=$(( R_SIDE + BOX_MOVE_DIRECTION ))
+
+  # Recurse if there are more boxes
+  if [[ ${MAP_ARRAY[L_SIDE_MOVE_COORDINATE]} == "[" ]] || \
+     [[ ${MAP_ARRAY[L_SIDE_MOVE_COORDINATE]} == "]" ]]
+  then
+    vertical_move_box "$L_SIDE_MOVE_COORDINATE" "$BOX_MOVE_DIRECTION"
+  fi
+  if [[ ${MAP_ARRAY[R_SIDE_MOVE_COORDINATE]} == "[" ]] || \
+     [[ ${MAP_ARRAY[R_SIDE_MOVE_COORDINATE]} == "]" ]]
+  then
+    vertical_move_box "$R_SIDE_MOVE_COORDINATE" "$BOX_MOVE_DIRECTION"
+  fi
+
+  MAP_ARRAY[L_SIDE_MOVE_COORDINATE]="["
+  MAP_ARRAY[R_SIDE_MOVE_COORDINATE]="]"
+  MAP_ARRAY[L_SIDE]="."
+  MAP_ARRAY[R_SIDE]="."
+}
+
+
+# Function to check if box can be moved in n direction
+vertical_check_move_box () {
+  local BOX_COORDINATE=$1
+  local BOX_MOVE_DIRECTION=$2
+
+  # Normalise coordinates
+  if [[ ${MAP_ARRAY[$BOX_COORDINATE]} == "[" ]]
+  then
+    local L_SIDE=$BOX_COORDINATE
+    local R_SIDE=$(( BOX_COORDINATE +1 ))
+  elif [[ ${MAP_ARRAY[$BOX_COORDINATE]} == "]" ]]
+  then
+    L_SIDE=$(( BOX_COORDINATE -1 ))
+    R_SIDE=$BOX_COORDINATE
+  fi
+
+  # Check if boxes are movable
+  local L_SIDE_MOVE_COORDINATE=$(( L_SIDE + BOX_MOVE_DIRECTION ))
+  local R_SIDE_MOVE_COORDINATE=$(( R_SIDE + BOX_MOVE_DIRECTION ))
+  if [[ ${MAP_ARRAY[$L_SIDE_MOVE_COORDINATE]} == '.' ]] && \
+     [[ ${MAP_ARRAY[$R_SIDE_MOVE_COORDINATE]} == '.' ]] # Can move
+  then
+    return 0
+  elif [[ ${MAP_ARRAY[$L_SIDE_MOVE_COORDINATE]} == '#' ]] || \
+       [[ ${MAP_ARRAY[$R_SIDE_MOVE_COORDINATE]} == '#' ]] # Blocked by wall
+  then
+    return 1
+  fi
+
+  # Recurse if there are more boxes
+  if [[ ${MAP_ARRAY[L_SIDE_MOVE_COORDINATE]} == "[" ]] || \
+     [[ ${MAP_ARRAY[L_SIDE_MOVE_COORDINATE]} == "]" ]]
+  then
+    vertical_check_move_box "$L_SIDE_MOVE_COORDINATE" "$BOX_MOVE_DIRECTION"
+    if [[ $? -eq 1 ]]
+    then
+      return 1
+    fi
+  fi
+  if [[ ${MAP_ARRAY[R_SIDE_MOVE_COORDINATE]} == "[" ]] || \
+     [[ ${MAP_ARRAY[R_SIDE_MOVE_COORDINATE]} == "]" ]]
+  then
+    vertical_check_move_box "$R_SIDE_MOVE_COORDINATE" "$BOX_MOVE_DIRECTION"
+    if [[ $? -eq 1 ]]
+    then
+      return 1
+    fi
+  fi
+}
+
+horizontal_move_box () {
+
+  local BOX_COOR=$1
+  local BOX_MOVE_DIRECTION=$2
+
+  local NEXT_SPOT=$(( BOX_COOR + BOX_MOVE_DIRECTION * 2 ))
+  if [[ ${MAP_ARRAY[$NEXT_SPOT]} == "#" ]]
+  then
+    return 1 # Failed to move box
+  elif [[ ${MAP_ARRAY[$NEXT_SPOT]} == "[" ]] || \
+       [[ ${MAP_ARRAY[$NEXT_SPOT]} == "]" ]]
+  then
+    horizontal_move_box "$NEXT_SPOT" "$BOX_MOVE_DIRECTION"
+    if [[ $? -eq 1 ]] ; then return 1 ; fi
+  elif [[ ${MAP_ARRAY[$NEXT_SPOT]} != "." ]]
+  then
+    return 1
+  fi
+
+  # Move the box
+  if [[ $NEXT_SPOT -lt $(( BOX_COOR + BOX_MOVE_DIRECTION )) ]]
+  then
+    MAP_ARRAY[NEXT_SPOT]="["
+    MAP_ARRAY[BOX_COOR + BOX_MOVE_DIRECTION]="]"
+  else
+    MAP_ARRAY[BOX_COOR + BOX_MOVE_DIRECTION]="["
+    MAP_ARRAY[NEXT_SPOT]="]"
+  fi
+  MAP_ARRAY[BOX_COOR]="."
+}
+
+# Load map
+read -r -a MAP_ARRAY <<< "$( 
+  < "$MAP_FILE" paste -s -d "" | 
+  sed -E '
+    s/#/##/g; 
+    s/\./../g; 
+    s/@/@./g; 
+    s/O/[]/g; 
+    s/(.)(.)/\1 \2 /g' 
+)"
+MAP_LEN=${#MAP_ARRAY[@]}
+
+print_map () {
+  printf "%s " "${MAP_ARRAY[@]}" | 
+    fold -w $(( MAP_WIDTH * 2 ))
+  printf "\n"
+}
+
+# Get robot position
+for (( i=0; i<MAP_LEN; i++ ))
+do
+  if [[ ${MAP_ARRAY[$i]} == "@" ]]
+  then
+    ROBOT_POSITION=$i
+    break
+  fi
+done
+printf "Robot position : %s\n" "$ROBOT_POSITION"
+
+# Hardcode direction values
+UP=$(( - MAP_WIDTH ))
+DOWN=$MAP_WIDTH
+LEFT=-1
+RIGHT=1
+
+# Iterate through directions
+MOVES=0
+print_map
+while read -r DIRECTION
+do
+
+  # Interpret directions
+  if [[ $DIRECTION == "^" ]]
+  then
+    DIRECTION_VALUE=$UP
+  elif [[ $DIRECTION == "v" ]]
+  then
+    DIRECTION_VALUE=$DOWN
+  elif [[ $DIRECTION == "<" ]]
+  then
+    DIRECTION_VALUE=$LEFT
+  elif [[ $DIRECTION == ">" ]]
+  then
+    DIRECTION_VALUE=$RIGHT
+  fi
+
+  NEXT_POSITION=$(( ROBOT_POSITION + DIRECTION_VALUE ))
+
+  # Box in front
+  if [[ ${MAP_ARRAY[$NEXT_POSITION]} == "[" ]] || \
+     [[ ${MAP_ARRAY[$NEXT_POSITION]} == "]" ]]
+  then
+    #printf "Hit box.\n"
+    if [[ $DIRECTION_VALUE -eq $LEFT ]] || \
+       [[ $DIRECTION_VALUE -eq $RIGHT ]]
+    then
+      #printf "Left right box movement.\n"
+      if horizontal_move_box "$NEXT_POSITION" "$DIRECTION_VALUE"
+      then
+        move_robot
+      fi
+    elif [[ $DIRECTION_VALUE -eq $UP ]] || \
+         [[ $DIRECTION_VALUE -eq $DOWN ]]
+    then
+      #printf "Up down box movement.\n"
+      if vertical_check_move_box "$NEXT_POSITION" "$DIRECTION_VALUE"
+      then
+        vertical_move_box "$NEXT_POSITION" "$DIRECTION_VALUE"
+        move_robot
+      fi
+    fi
+
+  # Wall in front, do nothing
+  elif [[ ${MAP_ARRAY[$NEXT_POSITION]} == "#" ]]
+  then
+    #printf "Next: %s Skipping\n" "${MAP_ARRAY[$NEXT_POSITION]}"
+    :
+  # Empty space, move forward
+  elif [[ ${MAP_ARRAY[$NEXT_POSITION]} == "." ]]
+  then
+    #printf "Next: %s Move robot forward\n" "${MAP_ARRAY[$NEXT_POSITION]}"
+    move_robot
+  fi
+  (( MOVES++ ))
+
+  #print_map
+done <<< "$( < "$DIRECTIONS_FILE" paste -s -d "" | sed -E 's/(.)(.)/\1 \2 /g' | tr ' ' '\n' )"
+printf "Moves: %s\n" "$MOVES"
+
+print_map
+
+# Calculate GPS values for boxes
+SUM=0
+BOX_COUNT=0
+for (( i=0; i<MAP_LEN; i++ ))
+do
+  if [[ ${MAP_ARRAY[i]} == "[" ]]
+  then
+    (( BOX_COUNT++ ))
+    X=$(( i % MAP_WIDTH ))
+    Y=$(( i / MAP_WIDTH * 100 ))
+    GPS=$(( X + Y ))
+    #printf "Box %s X: %s Y: %s GPS: %s\n" "$i" "$X" "$Y" "$GPS"
+    (( SUM+=GPS ))
+  fi
+done
+printf "Sum: %s\n" "$SUM"
+printf "Box count: %s\n" "$BOX_COUNT"

2024/day-16/input

@@ -0,0 +1,141 @@
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+#S#...............................................#.................#.......#...........#.........#...........#.......#...............#.....#
+#############################################################################################################################################

2024/day-16/solution-1.sh

@@ -0,0 +1,253 @@
+#!/usr/bin/env bash
+
+FUNCNEST=99999
+FILE=test-input-1
+
+# Load map
+read -r -a MAP_ARRAY <<< "$( < "$FILE" paste -s -d "" | sed -E 's/(.)(.)/\1 \2 /g' )"
+#read -r -a CHECKPOINT_ARRAY <<< "$( < "$FILE" paste -s -d "" | sed -E 's/(.)(.)/\1 \2 /g' )"
+MAP_WIDTH=$(( $( head -1 "$FILE" | wc -c ) -1 ))
+MAP_LEN=${#MAP_ARRAY[@]}
+MAP_HEIGHT=$( < "$FILE" wc -l )
+printf "Map len: %s Map width: %s Map height: %s\n" "$MAP_LEN" "$MAP_WIDTH" "$MAP_HEIGHT"
+DIR_UP=$(( - MAP_WIDTH ))
+DIR_DOWN=$MAP_WIDTH
+DIR_LEFT=-1
+DIR_RIGHT=1
+
+print_map () {
+  printf "%s " "${MAP_ARRAY[@]}" | fold -w $(( MAP_WIDTH * 2 ))
+  printf "\n"
+}
+
+# Get starting position
+for (( i=0; i<MAP_LEN; i++ ))
+do
+  if [[ ${MAP_ARRAY[$i]} == "S" ]]
+  then
+    START_POSITION=$i
+    MAP_ARRAY[START_POSITION]="X"
+    break
+  fi
+done
+printf "Start position: %s\n" "$START_POSITION"
+
+# Get end position
+for (( i=0; i<MAP_LEN; i++ ))
+do
+  if [[ ${MAP_ARRAY[$i]} == "E" ]]
+  then
+    END_POSITION=$i
+    MAP_ARRAY[END_POSITION]="X"
+    break
+  fi
+done
+printf "End position: %s\n" "$END_POSITION"
+
+print_map
+
+# Mark all checkpoints
+declare -A CHECKPOINT_ARRAY
+CHECKPOINT_ARRAY[$START_POSITION]=0
+for (( i=0; i<MAP_LEN; i++ ))
+do
+  if [[ ${MAP_ARRAY[$i]} != "." ]] ;then continue ;fi
+  STEP=$i
+  ADJ_COUNT=0
+  UP=$(( STEP + DIR_UP ))
+  DOWN=$(( STEP + DIR_DOWN ))
+  LEFT=$(( STEP + DIR_LEFT ))
+  RIGHT=$(( STEP + DIR_RIGHT ))
+  if [[ ${MAP_ARRAY[$UP]} == "." ]] && [[ $UP -gt 0 ]]
+  then
+    (( ADJ_COUNT++ ))
+  fi
+  if [[ ${MAP_ARRAY[$DOWN]} == "." ]] && [[ $DOWN -lt $MAP_LEN ]]
+  then
+    (( ADJ_COUNT++ ))
+  fi
+  if [[ ${MAP_ARRAY[$LEFT]} == "." ]]
+  then
+    (( ADJ_COUNT++ ))
+  fi
+  if [[ ${MAP_ARRAY[$RIGHT]} == "." ]]
+  then
+    (( ADJ_COUNT++ ))
+  fi
+  if [[ $ADJ_COUNT -gt 2 ]]
+  then
+    MAP_ARRAY[STEP]=X
+    CHECKPOINT_ARRAY[$STEP]=0
+  fi
+done
+CHECKPOINT_ARRAY[$END_POSITION]=0
+printf "%s " "${!CHECKPOINT_ARRAY[@]}"
+printf "\n"
+CHECKPOINT_ARRAY_LEN=${#CHECKPOINT_ARRAY[@]}
+
+# Iterate over checkpoints and print pairings
+declare -A CHECKPOINT_PAIRS
+declare -A CHECKPOINT_PAIR_WEIGHTS
+PREV_UP=$(( 2 * 5 * 7 ))
+PREV_DOWN=$(( 3 * 5 * 7 ))
+PREV_LEFT=$(( 2 * 3 * 5 ))
+PREV_RIGHT=$(( 2 * 3 * 7 ))
+get_weight_change () {
+  local POSITION=$1
+  local NEXT_POSITION=$2
+  local DIRECTION=$3
+  # Check if next position is moving in line with the previous direction
+  if [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_UP ]] && [[ $(( DIRECTION % PREV_UP )) -eq 0 ]]
+  then
+    printf "1"
+    return 0
+elif [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_DOWN ]] && [[ $(( DIRECTION % PREV_DOWN )) -eq 0 ]]
+  then
+    printf "1"
+    return 0
+elif [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_LEFT ]] && [[ $(( DIRECTION % PREV_LEFT )) -eq 0 ]]
+  then
+    printf "1"
+    return 0
+elif [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_RIGHT ]] && [[ $(( DIRECTION % PREV_RIGHT )) -eq 0 ]]
+  then
+    printf "1"
+    return 0
+  fi
+  # For different directions, weight change is 1000
+  printf "1000"
+}
+recurse_travel () {
+  local POSITION=$1 # Current position
+  local CHECKPOINT=$2 # Previous checkpoint
+  local DIRECTION=$3 # Allowed adjacent tiles
+  local WEIGHT=$4 # Weightage so far
+
+  # Search adjacent tiles
+  # Recurse if it's movable
+  # Add a checkpoint pair and weights if checkpoint found
+  # 2 : Up
+  # 3 : Down
+  # 5 : Left
+  # 7 : Right
+  if [[ $(( DIRECTION % 2 )) -eq 0 ]]
+  then
+    local UP=$(( POSITION + DIR_UP ))
+    if [[ $UP -gt 0 ]]
+    then
+      if [[ ${MAP_ARRAY[$UP]} == "." ]]
+      then
+        WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$UP" "$DIRECTION" )
+        recurse_travel "$UP" "$CHECKPOINT" "$(( 2 * 5 * 7 ))" "$(( WEIGHT + WEIGHT_CHANGE ))"
+      elif [[ -v CHECKPOINT_ARRAY[$UP] ]]
+      then
+        WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$UP" "$DIRECTION" )
+        CHECKPOINT_PAIRS["$CHECKPOINT-$UP"]=0
+        CHECKPOINT_PAIR_WEIGHTS["$CHECKPOINT-$UP"]=$(( WEIGHT + WEIGHT_CHANGE ))
+      fi
+    fi
+  fi
+  if [[ $(( DIRECTION % 3 )) -eq 0 ]] && [[ $DOWN -lt $MAP_LEN ]]
+  then
+    local DOWN=$(( POSITION + DIR_DOWN ))
+    if [[ $DOWN -lt $MAP_LEN ]]
+    then 
+      if [[ ${MAP_ARRAY[$DOWN]} == "." ]]
+      then
+        WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$DOWN" "$DIRECTION" )
+        recurse_travel "$DOWN" "$CHECKPOINT" "$(( 3 * 5 * 7 ))" "$(( WEIGHT + WEIGHT_CHANGE ))"
+      elif [[ -v CHECKPOINT_ARRAY[$DOWN] ]]
+      then
+        WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$DOWN" "$DIRECTION" )
+        CHECKPOINT_PAIRS["$CHECKPOINT-$DOWN"]=0
+        CHECKPOINT_PAIR_WEIGHTS["$CHECKPOINT-$DOWN"]=$(( WEIGHT + WEIGHT_CHANGE ))
+      fi
+    fi
+  fi
+  if [[ $(( DIRECTION % 5 )) -eq 0 ]]
+  then
+    local LEFT=$(( POSITION + DIR_LEFT ))
+    if [[ ${MAP_ARRAY[$LEFT]} == "." ]]
+    then
+      WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$LEFT" "$DIRECTION" )
+      recurse_travel "$LEFT" "$CHECKPOINT" "$(( 2 * 3 * 5 ))" "$(( WEIGHT + WEIGHT_CHANGE ))"
+    elif [[ -v CHECKPOINT_ARRAY[$LEFT] ]]
+    then
+      WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$LEFT" "$DIRECTION" )
+      CHECKPOINT_PAIRS["$CHECKPOINT-$LEFT"]=0
+      CHECKPOINT_PAIR_WEIGHTS["$CHECKPOINT-$LEFT"]=$(( WEIGHT + WEIGHT_CHANGE ))
+    fi
+  fi
+  if [[ $(( DIRECTION % 7 )) -eq 0 ]]
+  then
+    local RIGHT=$(( POSITION + DIR_RIGHT ))
+    if [[ ${MAP_ARRAY[$RIGHT]} == "." ]]
+    then
+      WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$RIGHT" "$DIRECTION" )
+      recurse_travel "$RIGHT" "$CHECKPOINT" "$(( 2 * 3 * 7 ))" "$(( WEIGHT + WEIGHT_CHANGE ))"
+    elif [[ -v CHECKPOINT_ARRAY[$RIGHT] ]]
+    then
+      WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$RIGHT" "$DIRECTION" )
+      CHECKPOINT_PAIRS["$CHECKPOINT-$RIGHT"]=0
+      CHECKPOINT_PAIR_WEIGHTS["$CHECKPOINT-$RIGHT"]=$(( WEIGHT + WEIGHT_CHANGE ))
+    fi
+  fi
+}
+ITER=99999
+for CHECKPOINT in "${!CHECKPOINT_ARRAY[@]}"
+do
+  recurse_travel "$CHECKPOINT" "$CHECKPOINT" "$(( 2 * 3 * 5 * 7 ))" "0"
+  (( ITER-- ))
+  if [[ $ITER -eq 0 ]] ; then break ;fi
+done
+for CHECKPOINT in "${!CHECKPOINT_PAIRS[@]}"
+do
+  printf "Dest %s from checkpoint %s\n" "${CHECKPOINT_PAIRS[$CHECKPOINT]}" "$CHECKPOINT"
+done | sort
+for CHECKPOINT in "${!CHECKPOINT_PAIR_WEIGHTS[@]}"
+do
+  printf "Weight %s for checkpoint pair %s\n" "${CHECKPOINT_PAIR_WEIGHTS[$CHECKPOINT]}" "$CHECKPOINT"
+done | sort
+
+if [[ ${#CHECKPOINT_PAIRS[@]} -ne ${#CHECKPOINT_PAIR_WEIGHTS[@]} ]]
+then
+  printf "Checkpoint count with weight counts do not match.\n"
+fi
+
+# Map out full paths for calculate final results for it
+# Quite akin to BFS
+declare -A FINAL_PATH
+FINAL_PATH[$START_POSITION]=0
+for (( i=0 ; i<CHECKPOINT_ARRAY_LEN ; i+= 1 )) # Start to end should only have these many iterations
+do
+  for PATH in "${!FINAL_PATH[@]}"
+  do
+    CHECKPOINT=${PATH##*-}
+    PATH_SCORE=${FINAL_PATH[$PATH]}
+    if [[ $CHECKPOINT -eq $END_POSITION ]] # This path has completed
+    then
+      continue
+    fi
+    for NEXT_CHECKPOINT in "${!CHECKPOINT_ARRAY[@]}" # Check if there is a next mapping
+    do
+      if [[ $PATH =~ -$NEXT_CHECKPOINT- ]]; then continue; fi # Prevent loops
+      PAIR="$CHECKPOINT-$NEXT_CHECKPOINT"
+      if [[ -v CHECKPOINT_PAIRS[$PAIR] ]]
+      then
+	FINAL_PATH["$PATH-$NEXT_CHECKPOINT"]=$(( PATH_SCORE + ${CHECKPOINT_PAIR_WEIGHTS[$PAIR]} ))
+	unset "FINAL_PATH[$PATH]"
+      fi
+    done
+  done
+done
+
+for PATH in "${!FINAL_PATH[@]}"
+do
+  END=${PATH##*-}
+  if [[ $END == "$END_POSITION" ]]
+  then
+    printf "Path: %s weight: %s \n" "$PATH" "${FINAL_PATH[$PATH]}"
+  fi
+done
+
+#print_map

2024/day-16/test-input-1

@@ -0,0 +1,15 @@
+###############
+#.......#....E#
+#.#.###.#.###.#
+#.....#.#...#.#
+#.###.#####.#.#
+#.#.#.......#.#
+#.#.#####.###.#
+#...........#.#
+###.#.#####.#.#
+#...#.....#.#.#
+#.#.#.###.#.#.#
+#.....#...#.#.#
+#.###.#.#.#.#.#
+#S..#.....#...#
+###############

2024/day-17/input

@@ -0,0 +1,5 @@
+Register A: 64196994
+Register B: 0
+Register C: 0
+
+Program: 2,4,1,1,7,5,1,5,4,0,0,3,5,5,3,0

2024/day-17/machine.sh

@@ -0,0 +1,160 @@
+#!/usr/bin/env bash
+
+adv () { # OPCODE 0
+  $DEBUG && printf "OPCODE : 0 OP: adv OPERAND: %s\n" "$1" >&2
+  OPERAND=$( get_combo "$1" )
+  #REG_A=$(( REG_A / (2 ** OPERAND) ))
+  REG_A=$( printf "%s / (2 ^ %s) \n" "$REG_A" "$OPERAND" | bc )
+}
+bxl () { # OPCODE 1
+  $DEBUG && printf "OPCODE : 1 OP: bxl OPERAND: %s\n" "$1" >&2
+  OPERAND=$1
+  REG_B=$(( REG_B ^ OPERAND ))
+}
+bst () { # OPCODE 2
+  $DEBUG && printf "OPCODE : 2 OP: bst OPERAND: %s\n" "$1" >&2
+  OPERAND=$( get_combo "$1" )
+  REG_B=$(( OPERAND % 8 ))
+}
+jnz () { # OPCODE 3
+  $DEBUG && printf "OPCODE : 3 OP: jnz OPERAND: %s\n" "$1" >&2
+  OPERAND=$1
+  if [[ $REG_A -eq 0 ]]
+  then
+    return 0
+  else
+    POINTER=$OPERAND
+  fi
+}
+bxc () { # OPCODE 4
+  $DEBUG && printf "OPCODE : 4 OP: bxc OPERAND: %s\n" "$1" >&2
+  # OPERAND=$1 # Deprecated for legacy reasons
+  REG_B=$(( REG_B ^ REG_C ))
+}
+out () { # OPCODE 5
+  $DEBUG && printf "OPCODE : 5 OP: out OPERAND: %s\n" "$1" >&2
+  OPERAND=$( get_combo "$1" )
+  printf "%s\n" "$(( OPERAND % 8 ))"
+}
+bdv () { # OPCODE 6
+  $DEBUG && printf "OPCODE : 6 OP: bdv OPERAND: %s\n" "$1" >&2
+  OPERAND=$( get_combo "$1" )
+  #REG_B=$(( REG_A / (2 ** OPERAND) ))
+  REG_B=$( printf "%s / (2 ^ %s) \n" "$REG_A" "$OPERAND" | bc )
+}
+cdv () { # OPCODE 7
+  $DEBUG && printf "OPCODE : 7 OP: cdv OPERAND: %s\n" "$1" >&2
+  OPERAND=$( get_combo "$1" )
+  #REG_C=$(( REG_A / (2 ** OPERAND) ))
+  REG_C=$( printf "%s / (2 ^ %s) \n" "$REG_A" "$OPERAND" | bc )
+}
+
+# Get combo operand
+get_combo () {
+  if [[ $OPERAND -eq 0 ]]
+  then
+    printf "$1"
+  elif [[ $OPERAND -eq 1 ]]
+  then
+    printf "$1"
+  elif [[ $OPERAND -eq 2 ]]
+  then
+    printf "$1"
+  elif [[ $OPERAND -eq 3 ]]
+  then
+    printf "$1"
+  elif [[ $OPERAND -eq 4 ]]
+  then
+    printf "%s" "$REG_A"
+  elif [[ $OPERAND -eq 5 ]]
+  then
+    printf "%s" "$REG_B"
+  elif [[ $OPERAND -eq 6 ]]
+  then
+    printf "%s" "$REG_C"
+  elif [[ $OPERAND -eq 7 ]]
+  then
+    printf "Reserved operand. Exiting.\n" >&2
+    exit 1
+  fi
+}
+
+# Check if the program is a quine
+check_quine () {
+  $DEBUG && printf "%s," "${INPUT[@]}"
+  $DEBUG && printf "%s," "${OUTPUT[@]}"
+  for (( i=0; i<${#INPUT[@]}; i++ ))
+  do
+    if [[ ${INPUT[$i]} != "${OUTPUT[$i]}" ]]
+    then
+      return 1
+    fi
+  done
+}
+
+# Check digits
+check_tail () {
+  $DEBUG && printf "%s," "${INPUT[@]}"
+  $DEBUG && printf "%s," "${OUTPUT[@]}"
+  for (( i=${#INPUT[@]}; i>=${#INPUT[@]}-$1; i-- ))
+  do
+    if [[ ${INPUT[$i]} != "${OUTPUT[$i]}" ]]
+    then
+      return 1
+    fi
+  done
+}
+
+# Interpret opcode
+read_opcode () {
+  local OPCODE=$1
+  local OPERAND=$2
+  if [[ $OPCODE -eq 0 ]]
+  then
+    adv "$OPERAND"
+    (( POINTER+=2 ))
+  elif [[ $OPCODE -eq 1 ]]
+  then
+    bxl "$OPERAND"
+    (( POINTER+=2 ))
+  elif [[ $OPCODE -eq 2 ]]
+  then
+    bst "$OPERAND"
+    (( POINTER+=2 ))
+  elif [[ $OPCODE -eq 3 ]]
+  then
+    # jnz itself moves the pointer
+    jnz "$OPERAND"
+  elif [[ $OPCODE -eq 4 ]]
+  then
+    bxc "$OPERAND"
+    (( POINTER+=2 ))
+  elif [[ $OPCODE -eq 5 ]]
+  then
+    out "$OPERAND"
+    (( POINTER+=2 ))
+  elif [[ $OPCODE -eq 6 ]]
+  then
+    bdv "$OPERAND"
+    (( POINTER+=2 ))
+  elif [[ $OPCODE -eq 7 ]]
+  then
+    cdv "$OPERAND"
+    (( POINTER+=2 ))
+  fi
+}
+
+execute_machine () {
+    POINTER=0
+    while [[ $POINTER -lt $INPUT_LEN ]]
+    do
+      OPCODE=${INPUT[$POINTER]}
+      OPERAND=${INPUT[$POINTER+1]}
+      read_opcode "$OPCODE" "$OPERAND"
+      $DEBUG && printf "Registers A : %s B: %s C : %s\n" "$REG_A" "$REG_B" "$REG_C" >&2
+      $DEBUG && printf "Pointer : %s\n" "$POINTER" >&2
+      (( MACHINE_ITER-- ))
+      if [[ $MACHINE_ITER -eq 0 ]] ; then break ; fi
+    done | paste -s -d " " 
+}
+

2024/day-17/solution-1.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+FILE=$1
+ITER=99
+DEBUG=false
+
+REG_A=$(grep 'Register A:' "$FILE" | cut -f2 -d: )
+REG_B=$(grep 'Register B:' "$FILE" | cut -f2 -d: )
+REG_C=$(grep 'Register C:' "$FILE" | cut -f2 -d: )
+read -r -a INPUT <<< "$(grep 'Program:' "$FILE" | cut -f2 -d: | tr ',' ' ' )"
+INPUT_LEN=${#INPUT[@]}
+
+printf "Registers A: %s B: %s C: %s\n" "$REG_A" "$REG_B" "$REG_C" >&2
+printf "Input : " >&2
+printf "%s " "${INPUT[@]}" >&2
+printf "\n" >&2
+
+# Load machine operations
+. machine.sh
+
+POINTER=0
+while [[ $POINTER -lt $INPUT_LEN ]]
+do
+  OPCODE=${INPUT[$POINTER]}
+  OPERAND=${INPUT[$POINTER+1]}
+  read_opcode "$OPCODE" "$OPERAND"
+  printf "Registers A : %s B: %s C : %s\n" "$REG_A" "$REG_B" "$REG_C" >&2
+  printf "Pointer : %s\n" "$POINTER" >&2
+  (( ITER-- ))
+  if [[ $ITER -eq 0 ]] ; then break ;fi
+done | paste -s -d "," 

2024/day-17/solution-2.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+
+FILE=$1
+ITER=1
+MACHINE_ITER=999
+DEBUG=false
+INCREMENT=100000000000
+TAIL_NUM=3
+
+# Load registry values
+REG_A=$(grep 'Register A:' "$FILE" | cut -f2 -d: )
+REG_B=$(grep 'Register B:' "$FILE" | cut -f2 -d: )
+REG_C=$(grep 'Register C:' "$FILE" | cut -f2 -d: )
+
+# Rewrite registry A starting value
+REG_A=100000000000000
+#REG_A=164541160582800
+
+# Load input string
+read -r -a INPUT <<< "$(grep 'Program:' "$FILE" | cut -f2 -d: | tr ',' ' ' )"
+INPUT_LEN=${#INPUT[@]}
+printf "Registers A: %s B: %s C: %s\n" "$REG_A" "$REG_B" "$REG_C" >&2
+#printf "Input: " >&2
+#printf "%s " "${INPUT[@]}" >&2
+#printf "\n" >&2
+
+# Load machine operations
+. machine.sh
+
+# Iterate registry A until last nth digits are matched
+PIN_DIGITS=0
+while ! check_tail "$INPUT_LEN" "$PIN_DIGITS"
+do
+  while ! check_tail "$TAIL_NUM" "$PIN_DIGITS"
+  do
+    read -r -a OUTPUT <<< "$( execute_machine )"
+    printf "Register A: %s\n" "$REG_A"
+    printf "Output:\t"
+    printf "%s " "${OUTPUT[@]}"
+    printf "\n"
+    printf "Input:\t"
+    printf "%s " "${INPUT[@]}"
+    printf "\n"
+    (( REG_A+=INCREMENT))
+    #(( ITER-- ))
+    if [[ $ITER -eq 0 ]] ; then break ; fi
+  done
+  PIN_DIGITS=$TAIL_NUM
+  printf "Matched digit. Reducing count"
+  (( TAIL_NUM+=1 ))
+  (( INCREMENT/= 50 ))
+done

2024/day-17/test-input-1

@@ -0,0 +1,5 @@
+Register A: 729
+Register B: 0
+Register C: 0
+
+Program: 0,1,5,4,3,0

2024/day-19/input-designs

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2024/day-19/input-towels

@@ -0,0 +1 @@
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2024/day-19/solution-1.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"

2024/day-19/solution-2.sh

@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+
+TOWEL_FILE=$1
+DESIGN_FILE=$2
+
+read -r -a TOWELS <<< "$( < "$TOWEL_FILE" tr ',' ' ' | paste -s -d " " )"
+read -r -a DESIGNS <<< "$( < "$DESIGN_FILE" paste -s -d " " )"
+
+# 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
+# Loop through designs
+for DESIGN in "${DESIGNS[@]}"
+do
+  # The idea is for each design, keep a sum of combinations
+  # for each index position of the DESIGN string
+  # Since the branches "multiply", just take the sum
+  # at the starting index, and add it to the end 
+  # of the "combined" index
+  # for each possible combination.
+  printf "Starting design : %s\n" "$DESIGN"
+  declare -A POINTER_LIST
+  POINTER_LIST[0]=1
+  POINTER_END=$(( ${#DESIGN}  ))
+
+  while true
+  do
+    POINTER=${#DESIGN}
+    # Pick lowest pointer value
+    for P in "${!POINTER_LIST[@]}"
+    do
+      if [[ $P -lt $POINTER ]] 
+      then
+        POINTER=$P
+      fi
+    done
+    POINTER_VALUE=${POINTER_LIST[$POINTER]}
+    # Check if end has reached
+    if [[ $POINTER -eq $POINTER_END ]]
+    then
+      break
+    fi
+
+    # Loop through towels and remove earliest pointer
+    for TOWEL in "${TOWELS[@]}"
+    do
+      TOWEL_LEN=${#TOWEL}
+      END=$(( POINTER + TOWEL_LEN ))
+      if [[ ${DESIGN:$POINTER:$TOWEL_LEN} == "$TOWEL" ]]
+      then
+	POINTER_LIST[$END]=$(( ${POINTER_LIST[$END]} + POINTER_VALUE ))
+      fi
+    done
+
+    # Done looping through for specific point
+    unset "POINTER_LIST[$POINTER]" 
+  done
+  printf "Total matches for %s is %s.\n" "$DESIGN" "${POINTER_LIST[$POINTER_END]}"
+  TOTAL_VALID=$(( TOTAL_VALID + POINTER_LIST[$POINTER_END] ))
+  unset "POINTER_LIST"
+done
+printf "Total valid designs: %s\n" "$TOTAL_VALID"

2024/day-19/test-designs

@@ -0,0 +1,8 @@
+brwrr
+bggr
+gbbr
+rrbgbr
+ubwu
+bwurrg
+brgr
+bbrgwb

2024/day-19/test-towels

@@ -0,0 +1 @@
+r, wr, b, g, bwu, rb, gb, br