From: Brett Parker Date: Mon, 7 Dec 2020 00:42:29 +0000 (+0000) Subject: First part X-Git-Url: https://git.sommitrealweird.co.uk/advent-of-code-2019.git/commitdiff_plain/bcb44f33292aa19afb49b6aafb4e60631b7de6cd First part --- diff --git a/day6/get_orbits.sh b/day6/get_orbits.sh new file mode 100644 index 0000000..a6d886f --- /dev/null +++ b/day6/get_orbits.sh @@ -0,0 +1,98 @@ +#!/bin/bash + +declare -A orbits +declare -A reverse_orbits + +exec 3&2 + + IFS="," + # check forwards + if [ ${#orbits[$start_point]} -gt 0 ]; then + for p in ${orbits[$start_point]}; do + if [ "$p" == "$last_start" ]; then + continue + fi + if [ $p == $end_point ]; then + echo $((offset+1)) + if [ $shortest_path -eq -1 ] || [ $offset -lt $shortest_path]; then + shortest_path=$((offset)) + fi + return 0 + else + o=$(get_path $p $end_point $start_point $((offset+1))) + if [ $? -eq 0 ]; then + if [ $shortest_path -eq -1 ] || [ $o -lt $shortest_path ]; then + shortest_path=$o + fi + fi + fi + done + fi + + # otherwise, time to check other paths + for p in ${reverse_orbits[$start_point]}; do + if [ "$p" == "$last_start" ]; then + continue + fi + if [ "$p" == "$end_point" ]; then + echo $((offset+1)) + if [ $shortest_path -eq -1 ] || [ $offset -lt $shortest_path]; then + shortest_path=$((offset)) + fi + return 0 + else + o=$(get_path $p $end_point $start_point $((offset+1))) + if [ $? -eq 0 ]; then + if [ $shortest_path -eq -1 ] || [ $o -lt $shortest_path ]; then + shortest_path=$o + fi + fi + fi + done + + echo $shortest_path +} + +#get_orbits COM 1 + +shortest_path=-1 +get_path YOU SAN "" 0 +