day6/get_yes_counts.sh

   1 #!/bin/bash
   2
   3 set -u
   4 set -e
   5
   6 declare -a group_questions
   7
   8 parse_file() {
   9     exec 3<input.txt
  10     declare -A questions
  11     while read -u 3 line; do
  12         #remove new lines
  13         line=${line//$'\r'//}
  14         line=${line//$'\n'//}
  15         # go through each character of line
  16         if [ "$line" == "" ]; then
  17             question_string=""
  18             for key in "${!questions[@]}"; do
  19                 question_string+="${key}"
  20             done
  21             group_questions+=($question_string)
  22             unset questions
  23             declare -A questions
  24             continue
  25         fi
  26         for (( a=0; a<${#line}; a++ )); do
  27             question=${line:$a:1}
  28             questions["$question"]=1
  29         done
  30     done
  31
  32     # last line was hit, so we need to process that too
  33     question_string=""
  34     for key in "${!questions[@]}"; do
  35         question_string+="${key}"
  36     done
  37     group_questions+=($question_string)
  38     unset questions
  39 }
  40
  41 parse_file
  42
  43 sum_of_groups=0
  44 for group in "${group_questions[@]}"; do
  45     sum_of_groups=$((sum_of_groups+${#group}))
  46 done
  47
  48 echo "Sum of groups: $sum_of_groups"