其它
Eve arranged cards in a line as it is shown in the figure below. At each move Eve is allowed to interchange any two cards. What is the smallest number of moves Eve needs to get the word KANGAROO?  insert pic 
Overseas Competition->Knowledge Point->Combinatorics->Logical Reasoning
First, switch K and 1st O to make KANGONOA.  Second, switch N and R to make KANGOROA.  Third, switch the last A and the 2nd O to make KANGAROO. 