题目网址: http://www.puzzleup.com/2017/ http://www.puzzleup.com/2017/puzzle/?3 答题时限: ８月24日７ＰＭ－比赛结束（约12月27日） 加分时限: ８月24日７ＰＭ－８月29日６：５９ＰＭ 答对可得基本分１００分。答案可上传５次，每改１次答案从基本分扣２０分。　 比赛期间内可随时上传答案，加分时限内答对第ｎ天加（６－ｎ）分　 　　 　　 另依题目的难易有额外加分（如有８０％的人这题答错，答对者加８０分）　　 ◆FOUR DIGITS A number has distinct digits and for its any four consecutive digits, the multiplication of the two digits in the middle is greater than the sum of the four digits. What is the greatest such number? 一数的所有数位皆不同， 且对任意四个连续位数，中间两位数的乘积皆大於四位数之和。 试问此数最大为多少？ -- 'Oh, Harry, don't you see?' Hermione breathed. 'If she could have done one thing to make absolutely sure that every single person in this school will read your interview, it was banning it!' ---'Harry Potter and the order of the phoenix', P513 --

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