#!/bin/bash # # ex2-sort.bash: Advent2020 game, day 1/game 2, with sort. CMD=${0##*/} readarray -t numbers <<< "$(sort -n)" declare -i i j k a b c m1 m2 for ((i=0; i<${#numbers[@]}; ++i)); do a=$((numbers[i])) for ((j=i+1; j<${#numbers[@]}; ++j)); do b=$((numbers[j])) ((a+b > 2020)) && break for ((k=j+1; k<${#numbers[@]}; ++k)); do c=$((numbers[k])) ((a+b+c > 2020)) && break if ((a+b+c == 2020)); then printf "${CMD} : %d:%d %d:%d %d:%d sum=%d mul=%d\n" \ $i $a $j $b $k $c \ $((a+b+c)) \ $((a*b*c)) break 3 fi done done done exit 0