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#!/bin/env ruby |
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ids = [] |
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File.readlines('./input').each do |line| |
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line.strip! |
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row = [0, 127] |
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col = [0, 7] |
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step = 64 |
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line[..6].each_char do |char| |
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row[0] += step if char == 'B' |
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row[1] -= step if char == 'F' |
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step /= 2 |
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end |
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step = 4 |
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line[-3..].each_char do |char| |
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col[0] += step if char == 'R' |
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col[1] -= step if char == 'L' |
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step /= 2 |
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end |
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id = (row[0] * 8) + col[0] |
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ids.push(id) |
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puts "Seat #{line} is at row #{row} and column #{col}. Seat id: #{id}" |
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end |
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puts "The highest seat ID is #{ids.max}" |
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ids.sort! |
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ids.each_index do |i| |
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next if i == 0 |
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if ids[i] != (ids[i-1] + 1) |
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puts "My seat is #{ids[i] - 1}" |
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break |
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end |
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end |
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