題目網址: http://www.puzzleup.com/2017/
http://www.puzzleup.com/2017/puzzle/?15
答題時限: 11月16日７ＰＭ－比賽結束（約12月27日）
加分時限: 11月16日７ＰＭ－11月21日６：５９ＰＭ
答對可得基本分１００分。答案可上傳５次，每改１次答案從基本分扣２０分。
比賽期間內可隨時上傳答案，加分時限內答對第ｎ天加（６－ｎ）分
另依題目的難易有額外加分（如有８０％的人這題答錯，答對者加８０分）
◆10-DIGIT NUMBER
A 10-digit number has distinct digits. Using all of its digits, two new
numbers are created. The sum of these two numbers is 99999 and their
multiplication is the same 10-digit number. Find this 10-digit number.
一個十位數的各位數都不同。使用這些數字形成兩個新數。
這兩個數的和是 99999，其積則是原來的十位數。
求此十位數。
--
'You've sort of made up for it tonight,' said Harry. 'Getting the
sword. Finishing the Horcrux. Saving my life.'
'That makes me sound a lot cooler then I was,' Ron mumbled.
'Stuff like that always sounds cooler then it really was,' said
Harry. 'I've been trying to tell you that for years.'
-- Harry Potter and the Deathly Hollows, P.308
--
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