# frozen_string_literal: true n = gets.to_i edges = {} (n - 1).times do x, y = gets.split.map(&:to_i) (edges[x] ||= []) << y (edges[y] ||= []) << x end root_node = 1 leaf_nodes = edges.find_all { |_k, v| v.length == 1 } .map(&:first) - [root_node] zero_nodes = [root_node] + leaf_nodes node_lengths = Array.new(n + 1) checked_nodes = Array.new(n + 1) { false } queue = [] zero_nodes.each do |rl| queue << rl checked_nodes[rl] = true node_lengths[rl] = 0 end while (i = queue.shift) next_root_length = node_lengths[i] + 1 edges[i].each do |t| next if checked_nodes[t] queue << t checked_nodes[t] = true node_lengths[t] = next_root_length end end node_lengths.shift puts node_lengths