首页：http://www.puzzleup.com/2010/ 时限：2010/11/11（四）19:00～11/17（三）18:59 答案可上传５次，但每改１次扣２０分（基本分为１００分） 在比赛期间内可随时回答，但只有在时限内回答者有额外加分 ◆Three Digits You have a number where any numeral appears at most twice. The sum of all neighboring three digits in this number is a square number. What is the maximum possible value for this number? Example: 74504 is such a number because no numeral appears more than twice and 7+4+5, 4+5+0 and 5+0+4 are square numbers. 你有个数，每个数字多出现两次。所有相邻的三位数的和是平方数。 问此数最大多少？ 例如：74504即为符合条件之数，因为每个数字皆没有出现多於两次， 且 7+4+5，4+5+0，5+0+4 皆为平方数。 -- 不算难...纸笔应该能解答 -- '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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