Working day 17 part 1
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@ -83,28 +83,33 @@ 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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CHECKPOINT_ARRAY_LEN=${#CHECKPOINT_ARRAY[@]}
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# Iterate over checkpoints and print pairings
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declare -A CHECKPOINT_PAIRS
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declare -A CHECKPOINT_PAIR_WEIGHTS
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PREV_UP=$(( 2 * 5 * 7 ))
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PREV_DOWN=$(( 3 * 5 * 7 ))
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PREV_LEFT=$(( 2 * 3 * 5 ))
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PREV_RIGHT=$(( 2 * 3 * 7 ))
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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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# Check if next position is moving in line with the previous direction
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if [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_UP ]] && [[ $(( DIRECTION % PREV_UP )) -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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elif [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_DOWN ]] && [[ $(( DIRECTION % PREV_DOWN )) -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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elif [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_LEFT ]] && [[ $(( DIRECTION % PREV_LEFT )) -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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elif [[ $(( NEXT_POSITION - POSITION )) -eq $DIR_RIGHT ]] && [[ $(( DIRECTION % PREV_RIGHT )) -eq 0 ]]
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then
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printf "1"
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return 0
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@ -113,45 +118,55 @@ get_weight_change () {
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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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local POSITION=$1 # Current position
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local CHECKPOINT=$2 # Previous checkpoint
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local DIRECTION=$3 # Allowed adjacent tiles
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local WEIGHT=$4 # Weightage so far
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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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# 2 : Up
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# 3 : Down
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# 5 : Left
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# 7 : Right
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if [[ $(( DIRECTION % 2 )) -eq 0 ]]
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then
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if [[ ${MAP_ARRAY[$UP]} == "." ]]
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local UP=$(( POSITION + DIR_UP ))
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if [[ $UP -gt 0 ]]
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then
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WEIGHT_CHANGE=$( 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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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" "$DIRECTION" )
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CHECKPOINT_PAIRS["$CHECKPOINT-$UP"]=0
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CHECKPOINT_PAIR_WEIGHTS["$CHECKPOINT-$UP"]=$(( WEIGHT + WEIGHT_CHANGE ))
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fi
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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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local DOWN=$(( POSITION + DIR_DOWN ))
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if [[ $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" "$DIRECTION" )
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CHECKPOINT_PAIRS["$CHECKPOINT-$DOWN"]=0
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CHECKPOINT_PAIR_WEIGHTS["$CHECKPOINT-$DOWN"]=$(( WEIGHT + WEIGHT_CHANGE ))
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fi
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fi
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fi
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if [[ $(( DIRECTION % 5 )) -eq 0 ]]
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then
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local LEFT=$(( POSITION + DIR_LEFT ))
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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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@ -159,12 +174,13 @@ recurse_travel () {
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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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CHECKPOINT_PAIRS["$CHECKPOINT-$LEFT"]=0
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CHECKPOINT_PAIR_WEIGHTS["$CHECKPOINT-$LEFT"]=$(( WEIGHT + WEIGHT_CHANGE ))
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fi
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fi
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if [[ $(( DIRECTION % 7 )) -eq 0 ]]
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then
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local RIGHT=$(( POSITION + DIR_RIGHT ))
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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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@ -172,25 +188,66 @@ recurse_travel () {
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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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CHECKPOINT_PAIRS["$CHECKPOINT-$RIGHT"]=0
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CHECKPOINT_PAIR_WEIGHTS["$CHECKPOINT-$RIGHT"]=$(( WEIGHT + WEIGHT_CHANGE ))
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fi
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fi
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}
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ITER=99999
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for CHECKPOINT in "${!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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recurse_travel "$CHECKPOINT" "$CHECKPOINT" "$(( 2 * 3 * 5 * 7 ))" "0"
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(( ITER-- ))
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if [[ $ITER -eq 0 ]] ; then break ;fi
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done
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for CHECKPOINT in "${!CHECKPOINT_PAIRS[@]}"
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do
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printf "DEST %s from checkpoint %s\n" "${CHECKPOINT_PAIRS[$CHECKPOINT]}" "$CHECKPOINT"
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done
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printf "Dest %s from checkpoint %s\n" "${CHECKPOINT_PAIRS[$CHECKPOINT]}" "$CHECKPOINT"
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done | sort
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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 | sort
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if [[ ${#CHECKPOINT_PAIRS[@]} -ne ${#CHECKPOINT_PAIR_WEIGHTS[@]} ]]
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then
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printf "Checkpoint count with weight counts do not match.\n"
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fi
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# Map out full paths for calculate final results for it
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# Quite akin to BFS
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declare -A FINAL_PATH
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FINAL_PATH[$START_POSITION]=0
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for (( i=0 ; i<CHECKPOINT_ARRAY_LEN ; i+= 1 )) # Start to end should only have these many iterations
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do
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for PATH in "${!FINAL_PATH[@]}"
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do
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CHECKPOINT=${PATH##*-}
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PATH_SCORE=${FINAL_PATH[$PATH]}
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if [[ $CHECKPOINT -eq $END_POSITION ]] # This path has completed
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then
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continue
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fi
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for NEXT_CHECKPOINT in "${!CHECKPOINT_ARRAY[@]}" # Check if there is a next mapping
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do
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if [[ $PATH =~ -$NEXT_CHECKPOINT- ]]; then continue; fi # Prevent loops
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PAIR="$CHECKPOINT-$NEXT_CHECKPOINT"
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if [[ -v CHECKPOINT_PAIRS[$PAIR] ]]
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then
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FINAL_PATH["$PATH-$NEXT_CHECKPOINT"]=$(( PATH_SCORE + ${CHECKPOINT_PAIR_WEIGHTS[$PAIR]} ))
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unset "FINAL_PATH[$PATH]"
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fi
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done
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done
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done
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# Score the path
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#
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for PATH in "${!FINAL_PATH[@]}"
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do
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END=${PATH##*-}
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if [[ $END == "$END_POSITION" ]]
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then
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printf "Path: %s weight: %s \n" "$PATH" "${FINAL_PATH[$PATH]}"
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fi
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done
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print_map
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#print_map
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