³°ÅÁ ¡ÖÅÅ¿®Ãì¤Î¤ªÊ줵¤ó¡× ºä¸µ ͧ²ð http://doga.jp/contest/con18/html/18_e35.htm ¤Ë¤Ä¤¤¤Æ¤Î´¶Áۤʤɤò½ñ¤¹þ¤à¥¹¥ì¥Ã¥É¤Ç¤¹¡£