aoc/2023/2/1/solution.sh

#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail
if [[ "${TRACE-0}" == "1" ]]; then
  set -o xtrace
fi

INPUT=$1

main ()
{
  declare -a colors=(red green blue)
  declare -A limits=([red]=12 [green]=13 [blue]=14)
  declare -a possible_ids
  while read -r game; do
    possible=true
    stripped_game=$(sed 's/^Game [0-9]\+: //' <<< "${game}")
    IFS=';' read -r -a sets <<< "${stripped_game}"
    for (( i=0; i<${#sets[@]}; i++ )); do
      for color in "${colors[@]}"; do
        count=$(grep -o "[0-9]* ${color}" <<< "${sets[$i]}" | grep -o '[0-9]*' || true)
        if [[ $count -gt ${limits[$color]} ]]; then
          possible=false
          break 2
        fi
      done
    done
    if $possible; then
      id=$(grep -o '[0-9]*' <<< "${game}" | head -n 1)
      possible_ids+=($id)
    fi
  done < "${INPUT}"
  declare -i sum=0
  for id in "${possible_ids[@]}"; do
    (( sum+=id ))
  done
  echo $sum
}

main