AdventOfCode-2018/day1.cr

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2018-12-02 21:40:18 -08:00
changes = File.read("day1_input").split("\n")
2018-12-02 21:34:51 -08:00
.select { |it| !it.empty? }
.map(&.to_i)
puts "Final frequency: #{changes.sum}"
count = { 0 => 1 }
acc = 0
changes.cycle do |i|
acc += i
old_count = count[acc]? || 0
new_count = old_count + 1
count[acc] = new_count
if new_count == 2
puts acc
exit
end
end