Day 16 Part 1 Non working
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196
2024/day-16/solution-1.sh
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196
2024/day-16/solution-1.sh
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#!/usr/bin/env bash
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FUNCNEST=99999
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FILE=test-input-1
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# Load map
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read -r -a MAP_ARRAY <<< "$( < "$FILE" paste -s -d "" | sed -E 's/(.)(.)/\1 \2 /g' )"
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#read -r -a CHECKPOINT_ARRAY <<< "$( < "$FILE" paste -s -d "" | sed -E 's/(.)(.)/\1 \2 /g' )"
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MAP_WIDTH=$(( $( head -1 "$FILE" | wc -c ) -1 ))
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MAP_LEN=${#MAP_ARRAY[@]}
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MAP_HEIGHT=$( < "$FILE" wc -l )
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printf "Map len: %s Map width: %s Map height: %s\n" "$MAP_LEN" "$MAP_WIDTH" "$MAP_HEIGHT"
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DIR_UP=$(( - MAP_WIDTH ))
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DIR_DOWN=$MAP_WIDTH
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DIR_LEFT=-1
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DIR_RIGHT=1
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print_map () {
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printf "%s " "${MAP_ARRAY[@]}" | fold -w $(( MAP_WIDTH * 2 ))
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printf "\n"
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}
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# Get starting position
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for (( i=0; i<MAP_LEN; i++ ))
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do
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if [[ ${MAP_ARRAY[$i]} == "S" ]]
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then
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START_POSITION=$i
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MAP_ARRAY[START_POSITION]="X"
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break
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fi
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done
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printf "Start position: %s\n" "$START_POSITION"
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# Get end position
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for (( i=0; i<MAP_LEN; i++ ))
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do
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if [[ ${MAP_ARRAY[$i]} == "E" ]]
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then
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END_POSITION=$i
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MAP_ARRAY[END_POSITION]="X"
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break
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fi
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done
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printf "End position: %s\n" "$END_POSITION"
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print_map
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# Mark all checkpoints
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declare -A CHECKPOINT_ARRAY
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CHECKPOINT_ARRAY[$START_POSITION]=0
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for (( i=0; i<MAP_LEN; i++ ))
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do
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if [[ ${MAP_ARRAY[$i]} != "." ]] ;then continue ;fi
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STEP=$i
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ADJ_COUNT=0
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UP=$(( STEP + DIR_UP ))
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DOWN=$(( STEP + DIR_DOWN ))
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LEFT=$(( STEP + DIR_LEFT ))
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RIGHT=$(( STEP + DIR_RIGHT ))
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if [[ ${MAP_ARRAY[$UP]} == "." ]] && [[ $UP -gt 0 ]]
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then
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(( ADJ_COUNT++ ))
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fi
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if [[ ${MAP_ARRAY[$DOWN]} == "." ]] && [[ $DOWN -lt $MAP_LEN ]]
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then
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(( ADJ_COUNT++ ))
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fi
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if [[ ${MAP_ARRAY[$LEFT]} == "." ]]
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then
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(( ADJ_COUNT++ ))
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fi
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if [[ ${MAP_ARRAY[$RIGHT]} == "." ]]
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then
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(( ADJ_COUNT++ ))
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fi
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if [[ $ADJ_COUNT -gt 2 ]]
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then
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MAP_ARRAY[STEP]=X
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CHECKPOINT_ARRAY[$STEP]=0
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fi
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done
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CHECKPOINT_ARRAY[$END_POSITION]=0
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printf "%s " "${!CHECKPOINT_ARRAY[@]}"
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printf "\n"
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# Iterate over checkpoints and print pairings
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declare -A CHECKPOINT_PAIRS
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declare -A CHECKPOINT_PAIR_WEIGHTS
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get_weight_change () {
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local POSITION=$1
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local NEXT_POSITION=$2
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local DIRECTION=$3
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# For same directions, weight change is 1
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if [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_UP ]] && [[ $(( DIRECTION % 2 )) -eq 0 ]]
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then
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printf "1"
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return 0
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elif [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_DOWN ]] && [[ $(( DIRECTION % 3 )) -eq 0 ]]
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then
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printf "1"
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return 0
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elif [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_LEFT ]] && [[ $(( DIRECTION % 5 )) -eq 0 ]]
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then
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printf "1"
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return 0
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elif [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_RIGHT ]] && [[ $(( DIRECTION % 7 )) -eq 0 ]]
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then
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printf "1"
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return 0
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fi
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# For different directions, weight change is 1000
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printf "1000"
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}
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recurse_travel () {
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local POSITION=$1
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local CHECKPOINT=$2
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local DIRECTION=$3
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local WEIGHT=$4
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local UP=$(( POSITION - MAP_WIDTH ))
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local DOWN=$(( POSITION + MAP_WIDTH ))
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local LEFT=$(( POSITION - 1 ))
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local RIGHT=$(( POSITION + 1 ))
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# Search adjacent tiles
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# Recurse if it's movable
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# Add a checkpoint pair and weights if checkpoint found
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if [[ $(( DIRECTION % 2 )) -eq 0 ]] && [[ $UP -gt 0 ]]
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then
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if [[ ${MAP_ARRAY[$UP]} == "." ]]
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then
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WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$UP" "$DIRECTION" )
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recurse_travel "$UP" "$CHECKPOINT" "$(( 2 * 5 * 7 ))" "$(( WEIGHT + WEIGHT_CHANGE ))"
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elif [[ -v CHECKPOINT_ARRAY[$UP] ]]
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then
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WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$UP" "$DIRECTION" )
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CHECKPOINT_PAIRS[$UP]=$CHECKPOINT
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CHECKPOINT_PAIR_WEIGHTS["$UP-$CHECKPOINT"]=$(( WEIGHT + WEIGHT_CHANGE ))
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fi
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fi
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if [[ $(( DIRECTION % 3 )) -eq 0 ]] && [[ $DOWN -lt $MAP_LEN ]]
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then
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if [[ ${MAP_ARRAY[$DOWN]} == "." ]]
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then
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WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$DOWN" "$DIRECTION" )
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recurse_travel "$DOWN" "$CHECKPOINT" "$(( 3 * 5 * 7 ))" "$(( WEIGHT + WEIGHT_CHANGE ))"
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elif [[ -v CHECKPOINT_ARRAY[$DOWN] ]]
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then
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WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$DOWN" "$DIRECTION" )
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CHECKPOINT_PAIRS[$DOWN]=$CHECKPOINT
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CHECKPOINT_PAIR_WEIGHTS["$DOWN-$CHECKPOINT"]=$(( WEIGHT + WEIGHT_CHANGE ))
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fi
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fi
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if [[ $(( DIRECTION % 5 )) -eq 0 ]]
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then
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if [[ ${MAP_ARRAY[$LEFT]} == "." ]]
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then
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WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$LEFT" "$DIRECTION" )
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recurse_travel "$LEFT" "$CHECKPOINT" "$(( 2 * 3 * 5 ))" "$(( WEIGHT + WEIGHT_CHANGE ))"
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elif [[ -v CHECKPOINT_ARRAY[$LEFT] ]]
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then
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WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$LEFT" "$DIRECTION" )
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CHECKPOINT_PAIRS[$LEFT]=$CHECKPOINT
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CHECKPOINT_PAIR_WEIGHTS["$LEFT-$CHECKPOINT"]=$(( WEIGHT + WEIGHT_CHANGE ))
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fi
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fi
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if [[ $(( DIRECTION % 7 )) -eq 0 ]]
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then
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if [[ ${MAP_ARRAY[$RIGHT]} == "." ]]
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then
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WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$RIGHT" "$DIRECTION" )
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recurse_travel "$RIGHT" "$CHECKPOINT" "$(( 2 * 3 * 7 ))" "$(( WEIGHT + WEIGHT_CHANGE ))"
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elif [[ -v CHECKPOINT_ARRAY[$RIGHT] ]]
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then
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WEIGHT_CHANGE=$( get_weight_change "$POSITION" "$RIGHT" "$DIRECTION" )
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CHECKPOINT_PAIRS[$RIGHT]=$CHECKPOINT
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CHECKPOINT_PAIR_WEIGHTS["$RIGHT-$CHECKPOINT"]=$(( WEIGHT + WEIGHT_CHANGE ))
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fi
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fi
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}
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for CHECKPOINT in "${!CHECKPOINT_ARRAY[@]}"
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do
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recurse_travel "$CHECKPOINT" "$CHECKPOINT" "$CHECKPOINT" "$(( 2 * 3 * 5 * 7 ))" "0"
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done
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for CHECKPOINT in "${!CHECKPOINT_PAIRS[@]}"
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do
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printf "DEST %s from checkpoint %s\n" "${CHECKPOINT_PAIRS[$CHECKPOINT]}" "$CHECKPOINT"
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done
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for CHECKPOINT in "${!CHECKPOINT_PAIR_WEIGHTS[@]}"
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do
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printf "Weight %s for checkpoint pair %s\n" "${CHECKPOINT_PAIR_WEIGHTS[$CHECKPOINT]}" "$CHECKPOINT"
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done
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# Score the path
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#
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print_map
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