require 'csv'

result_ary = [ ]

CSV.foreach( "input.csv" ) do |row| # 1行ずつ処理する
split_ary = split_string( row[ 1 ] )

split_ary.each do |url|
result_ary.push [ row[ 0 ], url ]
end
end

# 2次元配列を、CSV 文字列に変換する
csv_str = result_ary.map( &:to_csv ).join
print csv_str