[中译] Puzzleup 2015 (7) Word Guess

楼主: LPH66 (-6.2598534e+18f)   2015-09-10 08:39:53
题目网址: http://www.puzzleup.com/2015/
http://www.puzzleup.com/2015/puzzle/?7
答题时限: 9月10日7PM-比赛结束(约12月16日)
加分时限: 9月10日7PM-9月15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)  
◆WORD GUESS
Your friend will pick a 4-letter word and you will make guesses in order to
find it.
- A word can contain only the letters A, B, C, and D, and they can be used
more than once.
- In your guess if at least three letters are in their correct places you
will win a prize.
What is the minimum number of guesses in order to guarantee to win the prize?
你的朋友选取一个四字母单词,你来猜它。
- 这个单词只包含 A, B, C, D 四种字母, 每个字母可以使用多于一次。
- 若你的猜测有至少三个字母在正确的位置则你获得奖品。
试问至少要多少次猜测才能保证获得奖品?

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