题目网址: http://www.puzzleup.com/2016/ http://www.puzzleup.com/2016/puzzle/?12 答题时限: 10月13日７ＰＭ－比赛结束（约12月14日） 加分时限: 10月13日７ＰＭ－10月19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）　　 ◆LAST DIGIT What is the last digit of the result of this addition operation? 以下和式的末位数字为何？ 1 2 3 (10^100 - 1) (10^100) 1 + 2 + 3 + ... + (10^100 - 1) + (10^100) ==== ¯\_(ツ)_/¯ -- '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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