select_uniq_path.rb

#!/usr/bin/env ruby                                                                                  

matrix = []

ARGF.each do |line|
  ary = line.strip.split
  matrix << ary
end

matrix.transpose.each do |row|
  node_id = row.shift
  sum = row.map {|x| x.to_i}.inject(0) {|s, i| s + i}
  if sum == 1
    puts [node_id[/\d+/], row].flatten.join("\t")
  end
end