class Node
  attr_reader :id, :siblings
  attr_accessor :state

  def initialize(id)
    @id = id
    @siblings = []
    @distances = {}
    @state = :white
  end

  def add(sibling, distance)
    @siblings << sibling
    @distances[sibling.id] = distance
  end

  def distance_from(other)
    @distances[other.id]
  end
end

if $PROGRAM_NAME == __FILE__
  n = gets.to_i

  nodes = []

  n.times do
    id, _, *rest = gets.chomp.split.map(&:to_i)

    nodes[id] ||= Node.new(id)
    node = nodes[id]

    rest.each_slice(2) do |sibling_id, distance|
      nodes[sibling_id] ||= Node.new(sibling_id)
      sibling = nodes[sibling_id]
      node.add(sibling, distance)
    end
  end

  distances = Array.new(n, Float::INFINITY)

  distances[0] = 0
  nodes[0].state = :gray

  loop do
    current = nil
    min = Float::INFINITY

    nodes.each do |node|
      next if node.state == :black

      distance = distances[node.id]

      if distance < min
        min = distance
        current = node
      end
    end

    break unless current

    current.state = :black

    current_distance = distances[current.id]

    current.siblings.each do |sibling|
      next if sibling.state == :black

      distance = current_distance + sibling.distance_from(current)

      if distance < distances[sibling.id]
        distances[sibling.id] = distance
        sibling.state = :gray
      end
    end
  end

  puts distances.map.with_index {|distance, id| [id, distance].join(' ') }.join("\n")
end