Broken day 10 part 1

2024/day-10/input

@@ -0,0 +1,54 @@
+543067650323210321032110356789890110710189878760134567
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2024/day-10/solution-1.sh

@@ -0,0 +1,147 @@
+#!/usr/bin/env bash
+
+FILE=input
+MAP_WIDTH=$(( $( head -1 "$FILE" | wc -c ) -1 ))
+MAP_LEN=$( < "$FILE" wc -l )
+read -r -a MAP_ARRAY <<< "$( paste -s -d "" <"$FILE" | sed -E 's/(.)(.)/\1 \2 /g' )"
+printf "%s " "${MAP_ARRAY[@]}"
+printf "\n"
+
+MAP_SIZE=${#MAP_ARRAY[@]}
+for (( i=0; i<MAP_SIZE ; i++ ))
+do
+  if [[ ${MAP_ARRAY[i]} -eq 0 ]]
+  then
+    printf "Trailhead found at position %s\n" "$i"
+    TRAILHEADS+=( "$i" )
+  elif [[ ${MAP_ARRAY[i]} -eq 9 ]]
+  then
+    printf "Peak found at position %s\n" "$i"
+    PEAKS+=( "$i" )
+  fi
+done
+printf "%s " "${TRAILHEADS[@]}"
+printf "\n"
+printf "%s " "${PEAKS[@]}"
+printf "\n"
+
+get_nine () {
+
+  # Trails are explored areas
+  # Paths are areas to explore
+  GET_NUM=$1
+  DIRECTIONS=$2
+  TRAIL=$3
+  COMBINATIONS=()
+
+  # For each direction, get multiplication of prime number
+  # corresponding to each direction
+  # Modulus for valid directions is 0
+  # 2 : Up
+  # 3 : Down
+  # 7 : Left
+  # 13 : Right
+  if [[ $(( DIRECTIONS % 2 )) -eq 0 ]] 
+  then
+    INDEX=$(( TRAIL - MAP_WIDTH ))
+    if [[ ${MAP_ARRAY[INDEX]} -eq $GET_NUM ]]
+    then
+      COMBINATIONS+=( "$INDEX" )
+    fi
+  fi
+  if [[ $(( DIRECTIONS % 3 )) -eq 0 ]] 
+  then
+    INDEX=$(( TRAIL + MAP_WIDTH ))
+    if [[ ${MAP_ARRAY[INDEX]} -eq $GET_NUM ]]
+    then
+      COMBINATIONS+=( "$INDEX" )
+    fi
+  fi
+  if [[ $(( DIRECTIONS % 7 )) -eq 0 ]] 
+  then
+    INDEX=$(( TRAIL - 1 ))
+    if [[ ${MAP_ARRAY[INDEX]} -eq $GET_NUM ]]
+    then
+      COMBINATIONS+=( "$INDEX" )
+    fi
+  fi
+  if [[ $(( DIRECTIONS % 13 )) -eq 0 ]]
+  then
+    INDEX=$(( TRAIL + 1 ))
+    if [[ ${MAP_ARRAY[INDEX]} -eq $GET_NUM ]]
+    then
+      COMBINATIONS+=( "$INDEX" )
+    fi
+  fi
+  printf "Get: %s \n" "$GET_NUM" >&2
+  printf "trail: %s \n" "$TRAIL" >&2
+  printf "neighbors found : %s \n" "${COMBINATIONS[@]}" >&2
+
+  # Check if the end has been reached
+  # or no matching neighbors
+  if [[ $GET_NUM -eq 9 ]] || [[ ${#COMBINATIONS[@]} -eq 0 ]]
+  then
+    # Exit recursion
+    printf "%s" "${#COMBINATIONS[@]}"
+    return
+  fi
+
+  # Recurse
+  TOTAL=0
+  NEXT_NUM=$(( GET_NUM+=1 ))
+  for INDEX in "${COMBINATIONS[@]}"
+  do
+    COUNT=$( 
+      get_nine \
+        "$NEXT_NUM" \
+	"$( get_valid_neighbors "$INDEX" )" \
+	"$INDEX" 
+    )
+    (( TOTAL+=COUNT ))
+  done
+  printf "%s" "$TOTAL"
+}
+
+get_valid_neighbors () {
+
+  IDX=$1
+  NUM=1
+
+  # Basically check for bounds
+  # For each direction, get multiplication of prime number
+  # corresponding to each direction
+  # 2 : Up
+  # 3 : Down
+  # 7 : Left
+  # 13 : Right
+  if [[ $(( IDX / MAP_LEN )) -gt 0 ]]
+  then
+    (( NUM*=2 ))
+  fi
+  if [[ $(( IDX / MAP_LEN )) -le $MAP_LEN ]]
+  then
+    (( NUM*=3 ))
+  fi
+  if [[ $(( IDX % MAP_WIDTH )) -ne 0 ]]
+  then
+    (( NUM*=7 ))
+  fi
+  if [[ $(( IDX % MAP_WIDTH )) -ne $(( MAP_WIDTH - 1 )) ]]
+  then
+    (( NUM*=13 ))
+  fi
+
+  printf "%s" "$NUM"
+}
+
+PATH_COUNT=0
+ITER=999999
+for TRAILHEAD in "${TRAILHEADS[@]}"
+do
+  COUNT=$( get_nine "1" "$( get_valid_neighbors "$TRAILHEAD" )" "$TRAILHEAD" )
+  (( PATH_COUNT+=COUNT ))
+  (( ITER-- ))
+  if [[ $ITER -eq 0 ]] ;then break; fi
+done
+
+printf "%s\n" "$PATH_COUNT"

2024/day-10/test-input-1

@@ -0,0 +1,8 @@
+89010123
+78121874
+87430965
+96549874
+45678903
+32019012
+01329801
+10456732

2024/day-10/test-result-1

@@ -0,0 +1 @@
+36