From: Brett Parker Date: Wed, 15 Dec 2021 13:45:26 +0000 (+0000) Subject: Day 15 part 1 X-Git-Url: https://git.sommitrealweird.co.uk/advent-of-code-2021.git/commitdiff_plain/1a9c7ee55d2c318015d89d84c6ad44eb632ffd1f?ds=sidebyside;hp=39130f89f58490298b833e8f9e0036a4844f4a3e Day 15 part 1 --- diff --git a/day15/example.txt b/day15/example.txt new file mode 100644 index 0000000..ab80887 --- /dev/null +++ b/day15/example.txt @@ -0,0 +1,10 @@ +1163751742 +1381373672 +2136511328 +3694931569 +7463417111 +1319128137 +1359912421 +3125421639 +1293138521 +2311944581 diff --git a/day15/input.txt b/day15/input.txt new file mode 100644 index 0000000..d8b93cf --- /dev/null +++ b/day15/input.txt @@ -0,0 +1,100 @@ +4644191171337732143712186124233573969322319997149343221542323211321212169142231235619969739483792471 +2221293392911371411593639962951141752813313921357129613938931533621918583683134152965492646642538116 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+filename="${1:-example.txt}" +exec 3<"$filename" + +max_y=0 +max_x=0 +declare -A map +declare -A tentative +declare -A lowest_distance + +while read -u 3 line; do + if [ "x$line" != "x" ]; then + max_x=${#line} + for (( a=0; a<$max_x; a++ )); do + map[$a,$max_y]=${line:$a:1} + tentative[$a,$max_y]=-1 + done + ((max_y+=1)) + fi +done + +((max_x-=1)) +((max_y-=1)) +total_points=$(($max_x*$max_y)) + +tentative["0,0"]=0 + +cur_x=0 +cur_y=0 + +echo +echo -n "Progress: 0%" + +# bad implementation of djikstra's algorithm +while [ "${tentative[$max_x,$max_y]+abc}" ]; do + echo -n -e "\rProgress: " + printf "%2d" $((100 - ((${#tentative[@]}*100) / $total_points))) + echo -n "%" + # where we are, we have the lowest_cost for this space, so + lowest_distance[$cur_x,$cur_y]="${tentative["$cur_x,$cur_y"]}" + unset tentative[$cur_x,$cur_y] + # now check to the left / right / up / down from our current node + # and give them tentative values + # lets do the calcs for the left + test_x=$((cur_x-1)) + if [ "${tentative[$test_x,$cur_y]+abc}" ]; then + new_cost=${lowest_distance[$cur_x,$cur_y]} + ((new_cost+=${map[$test_x,$cur_y]})) + if [ $new_cost -lt ${tentative[$test_x,$cur_y]} ] || [ "${tentative[$test_x,$cur_y]}" -eq -1 ]; then + tentative[$test_x,$cur_y]=$new_cost + fi + fi + # and the right + test_x=$((cur_x+1)) + if [ "${tentative[$test_x,$cur_y]+abc}" ]; then + new_cost=${lowest_distance[$cur_x,$cur_y]} + ((new_cost+=${map[$test_x,$cur_y]})) + if [ $new_cost -lt ${tentative[$test_x,$cur_y]} ] || [ "${tentative[$test_x,$cur_y]}" -eq -1 ]; then + tentative[$test_x,$cur_y]=$new_cost + fi + fi + # above + test_y=$((cur_y-1)) + if [ "${tentative[$cur_x,$test_y]+abc}" ]; then + new_cost=${lowest_distance[$cur_x,$cur_y]} + ((new_cost+=${map[$cur_x,$test_y]})) + if [ $new_cost -lt ${tentative[$cur_x,$test_y]} ] || [ "${tentative[$cur_x,$test_y]}" -eq -1 ]; then + tentative[$cur_x,$test_y]=$new_cost + fi + fi + # below + test_y=$((cur_y+1)) + if [ "${tentative[$cur_x,$test_y]+abc}" ]; then + new_cost=${lowest_distance[$cur_x,$cur_y]} + ((new_cost+=${map[$cur_x,$test_y]})) + if [ $new_cost -lt ${tentative[$cur_x,$test_y]} ] || [ "${tentative[$cur_x,$test_y]}" -eq -1 ]; then + tentative[$cur_x,$test_y]=$new_cost + fi + fi + + # find the new lowest tentative + new_location="-1,-1" + new_value=-1 + for location in "${!tentative[@]}"; do + if [ "${tentative[$location]}" -gt -1 ]; then + if [ $new_location == "-1,-1" ]; then + new_location=$location + new_value=${tentative[$location]} + elif [ "${tentative[$location]}" -lt $new_value ]; then + new_location=$location + new_value=${tentative[$location]} + fi + fi + done + if [ "$new_location" == "-1,-1" ]; then + break + fi + cur_x=${new_location%,*} + cur_y=${new_location#*,} +done +echo -e "\rProgress: 100%" + +# if we've reached here, we've got the lowest risk route to the bottom right +echo "Lowest route cost: ${lowest_distance[$max_x,$max_y]}"