Code for the 1000 subscribers challenge at The Coder Cafe: https://www.thecoder.cafe/p/1000

the-coder-cafe-challenge-2025-04-23.sh

#!/bin/bash

OIFS=$IFS
IFS=$'\n'

primary=""
declare -A routes
declare -a arrivals

for line in $(cat "$1"); do
  IFS=$OIFS
  read _ type _ <<< "$line"

  if [[ "$type" == "TRANSMISSION:" ]]
  then
    read _ _ _ from _ to _ _ capacity _ <<< "$line"
    echo "from=$from / to=$to / capacity=$capacity"
    routes[$from:$to]=$capacity
  fi

  if [[ "$type" == "ALERT:" ]]
  then
    read _ _ _ _ _ primary _ <<< "$line"
    echo "primary=$primary"
  fi

  if [[ "$type" == "CRITICAL:" ]]
  then
    read _ _ _ _ _ _ end <<< "$line"
    IFS=', ' read -a arrivals <<< "$end"
    OFS=','
    echo "arrivals=[${arrivals[@]}]"
  fi
done

declare -i total=0

for i in "${!arrivals[@]}"; do
  arrival="${arrivals[$i]}"
  route="$primary:$arrival"
  capacity="${routes[$route]:-0}"
  total=$((total + capacity))
  printf "arrivals[%d]='%s' / route='%s' / capacity=%d / total=%d\n" "$i" "$arrival" "$route" "$capacity" "$total"
done

echo "Total passengers from $primary to [${arrivals[@]}] is $total"