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aoc2021/02/solution_2.zsh

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#!/usr/bin/zsh
integer aim=0
integer h=0
integer v=0
IFS="
"
for line in "${(@f)}"$(<input.txt)
{
cmd=(${(s/ /)line})
case $cmd[1] in
down)
((aim += $cmd[2]))
;;
up)
((aim -= $cmd[2]))
;;
forward)
((h += $cmd[2]))
((v += aim * $cmd[2]))
;;
esac
}
print Answer: $((h * v))