题目网址: http://www.puzzleup.com/2013/ http://www.puzzleup.com/2013/puzzle/?260 答题时限: 11月28日７ＰＭ－比赛结束（约12月11日） 加分时限: 11月28日７ＰＭ－12月２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）　　 ◆Picked Number A number is picked, and five guesses are made to find this number. The guesses are written on a paper, and the differences between the guesses and the picked number (by subtracting the smaller from the bigger) are written on another paper. Later one number is randomly erased from each paper. As a result there are 4 numbers on each paper. Guesses: 27, 32, 44, 45 Differences: 5, 7, 10, 13 If the picked number can be found using these information, what is this number? 有一个数被选取，然後做了五次对这个数的猜测。 这五个猜测一起写在一张纸上， 然後在另一张纸上写下这五个猜测跟被选数之间的差 (固定由大减去小)。 然後两张纸各任意地抹去了一个数。 於是这两张纸上各剩下了四个数字，如下： 猜测： 27, 32, 44, 45 差距： 5, 7, 10, 13 由这些资讯试求被选数。 -- '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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