38 lines
794 B
Ruby
38 lines
794 B
Ruby
# frozen_string_literal: true
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f = File.open('./2023/day8/data')
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directions = f.readline.strip.split('')
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starting_vertices = []
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graph = {}
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f.each_line do |line|
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line.strip!
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next if line.empty?
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vertex_label = line.split(' ')[0]
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graph[vertex_label] = line.split('(')[1].split(')')[0].split(', ')
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starting_vertices << vertex_label if vertex_label.end_with? 'A'
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end
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res = -1
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starting_vertices.each do |vertex|
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i = 0
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curr_length = 0
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cur_pos = vertex
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until cur_pos.end_with? 'Z'
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i = 0 if i == directions.length
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cur_pos = graph[cur_pos][0] if directions[i] == 'L'
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cur_pos = graph[cur_pos][1] if directions[i] == 'R'
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i += 1
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curr_length += 1
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end
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res = if res == -1
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curr_length
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else
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res.lcm(curr_length)
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end
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end
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puts res
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