4686044    16:50:13   21 Dec 2012    Marian Darius    1297. Palindrome    C++    Accepted      0.031    108 KB

Just try iterating the middle of the palindrome and extend to both ends, until you find two elements that are different.

Seriously?
Are you really think that you are the first who do it for O(N^2) with the same idea? And it's not the first topic in the forum about this algo.

I don't know why but I get a TLE in #15 with the same approach as yours.