回複：有沒有好辦法？

來源: 於 2012-01-06 17:03:28 [舊帖] [給我悄悄話] 本文已被閱讀：次

If we can have a lot of "secnod "s ,answer is 2009-1004=1005,...Otherwise,...2009-1005=4

So,005 or 004 is answer.