Working part 2. Added check_tail for digit matching.

2024/day-17/machine.sh

@@ -3,7 +3,8 @@
 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=$(( REG_A / (2 ** OPERAND) ))
+  REG_A=$( printf "%s / (2 ^ %s) \n" "$REG_A" "$OPERAND" | bc )
 }
 bxl () { # OPCODE 1
   $DEBUG && printf "OPCODE : 1 OP: bxl OPERAND: %s\n" "$1" >&2
@@ -38,12 +39,14 @@ out () { # OPCODE 5
 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=$(( REG_A / (2 ** OPERAND) ))
+  REG_B=$( 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=$(( REG_A / (2 ** OPERAND) ))
+  REG_C=$( printf "%s / (2 ^ %s) \n" "$REG_A" "$OPERAND" | bc )
 }
 
 # Get combo operand
@@ -78,7 +81,22 @@ get_combo () {
 
 # Check if the program is a quine
 check_quine () {
-  for (( i=0; i<INPUT_LEN; i++ ))
+  $DEBUG && printf "%s," "${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
@@ -125,3 +143,18 @@ read_opcode () {
     (( 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-2.sh

@@ -1,31 +1,44 @@
 #!/usr/bin/env bash
 
 FILE=$1
-ITER=99
+ITER=1
+MACHINE_ITER=999
 DEBUG=false
+INCREMENT=1
+TAIL_NUM=16
 
 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: )
+#REG_A=100000000000000
+REG_A=164541160582800
 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" "$REG_C" >&2
-printf "Input : " >&2
+#printf "Input: " >&2
-printf "%s " "${INPUT[@]}" >&2
+#printf "%s " "${INPUT[@]}" >&2
-printf "\n" >&2
+#printf "\n" >&2
 
 # Load machine operations
 . machine.sh
 
-POINTER=0
+#while ! check_quine
-while [[ $POINTER -lt $INPUT_LEN ]]
+while ! check_tail "$TAIL_NUM"
 do
-  OPCODE=${INPUT[$POINTER]}
+  read -r -a OUTPUT <<< "$( execute_machine )"
-  OPERAND=${INPUT[$POINTER+1]}
+  printf "Register A: %s\n" "$REG_A"
-  read_opcode "$OPCODE" "$OPERAND"
+  printf "Output:\t"
-  printf "Registers A : %s B: %s C : %s\n" "$REG_A" "$REG_B" "$REG_C" >&2
+  #printf "%s " "${OUTPUT[@]}"
-  printf "Pointer : %s\n" "$POINTER" >&2
+  for i in "${OUTPUT[@]}"
-  (( ITER-- ))
+  do
+    printf "%s " "$i" # Print octal representation
+  done
+  printf "\n"
+  printf "Input:\t"
+  printf "%s " "${INPUT[@]}"
+  printf "\n"
+  (( REG_A+=INCREMENT))
+  #(( ITER-- ))
   if [[ $ITER -eq 0 ]] ; then break ; fi
-done | paste -s -d "," 
+done