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How about using double linked list.
like this :
(find right end of first and left end of second then connect them.)
a<->b, c<->d, e<->f, g<->h
a-d
(right end of 'a' is 'b' and left end of 'd' is 'c' so connect 'b' and 'c')
a<->b<->c<->d
:
:
Here's the code :
(In fact the code has a problem :
if you add pairs in same group alreday, the code will make cirular link
so need to add the code checking the case)
- curiosus October 20, 2014