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return the longest substring(which is palindrome)'s length... It's really confuse
in 'palindrome' are 55 substrings? it's correct ??
A palindrome is a sequence of letters which reads the same backward as forward, e.g.
"rotator"(see Wikipedia).There are
n * (n + 1) / 2substrings in every string, e.g."palindrome"has substrings"palindrome","palindrom","alindrome","palindro","alindrom","lindrome", ...Find the length of the longest substring that is a palindrome.
E.g.
"asequenceofletters"contains the substring"ette"which is a palindrom. Result: 4.