add part 2 script

day/01/part2.sh

@@ -0,0 +1,47 @@
+#! /bin/bash
+
+#set -x
+
+FILE_IN="${1}"
+
+left_list=()
+right_list=()
+
+while read -r l; do
+  echo "reading new line [$l]"
+  IFS=" "
+  read -ra line_split <<< "${l}"
+  unset IFS
+  echo "first number [${line_split[0]}]"
+  echo "second number [${line_split[1]}]"
+  left_list+=("${line_split[0]}")
+  right_list+=("${line_split[1]}")
+done <"$FILE_IN"
+
+echo "${left_list[@]}"
+echo "${right_list[@]}"
+
+if [[ ${#left_list[@]} -ne ${#right_list[@]} ]]; then
+  echo "arrays dont match, wtf?"
+  exit 1
+else
+  echo "length of lists ${#left_list[@]}"
+fi
+
+list_similarity=()
+
+for i in "${left_list[@]}"; do
+  echo "checking for ${i}"
+  IFS=$'\n'
+  count="$(grep -oc "${i}" <<<"${right_list[*]}")"
+  unset IFS
+  list_similarity+=($((i*count)))
+done
+
+final_out=0
+
+for v in "${list_similarity[@]}"; do
+  final_out=$((final_out + v))
+done
+
+echo "final output: ${final_out}"