百度作业网求助SATog 第6套 section 2 第11题
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求助SATog 第6套 section 2 第11题
Z W Y X
The sequence above may be changed in either of two ways.Either two adjacent letters may be interchanged or the entire sequence may be reversed.What is the LEAST number of such changes needed to be put the letters into alphabetical order from left to righe?
Z W Y X
The sequence above may be changed in either of two ways.Either two adjacent letters may be interchanged or the entire sequence may be reversed.What is the LEAST number of such changes needed to be put the letters into alphabetical order from left to righe?
the answer is 3
reverse the sequence ,X Y W Z
interchange W and Y ,X W Y Z
interchange W and X ,W X Y Z
reverse the sequence ,X Y W Z
interchange W and Y ,X W Y Z
interchange W and X ,W X Y Z