Created
December 15, 2020 11:02
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Advent of code 2020 Day 15
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@input = [0,12,6,13,20,1,17] | |
@numbers = {} | |
@input.each_with_index do |input, index| | |
@numbers[input] = { count: 1, last_spoken_on: index + 1, last_spoken_before_on: nil } | |
end | |
@last_number_spoken = @input.last | |
@turn_count = @input.length + 1 | |
while(@turn_count <= 30000000) do | |
if @numbers[@last_number_spoken][:count] == 1 | |
@spoken_number = 0 | |
elsif @numbers[@last_number_spoken][:count] > 1 | |
@spoken_number = @numbers[@last_number_spoken][:last_spoken_on] - @numbers[@spoken_number][:last_spoken_before_on] | |
else | |
@spoken_number = 0 | |
end | |
@numbers[@spoken_number] ||= {count: 0, last_spoken_on: nil, last_spoken_before_on: nil} | |
@numbers[@spoken_number][:last_spoken_before_on] = @numbers[@spoken_number][:last_spoken_on] | |
@numbers[@spoken_number][:last_spoken_on] = @turn_count | |
@numbers[@spoken_number][:count] += 1 | |
@last_number_spoken = @spoken_number | |
@turn_count += 1 | |
end | |
puts @spoken_number.inspect |
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