I found this question in Codeforces Round #373 (Div. 2).
http://codeforces.me/problemset/problem/719/B
My solution:
Can someone please help me find why my solution fails and how to correct it accordingly?
Thanks in advance!
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"he can either swap any two cockroaches". Did you notice this line? Not necessarily two cockroaches should be adjacent to swap. I did the same mistake though :(
Thanks!