Leetcode:647. Palindromic Substrings

Leetcode:647. Palindromic Substrings 參考第5題http://www.cnblogs.com/Michael2397/p/8036163.html，一下子就ac掉了，這裏有個解釋https://discuss.leetcode.com/topic/96884/very-simple-java-solution-with-detail-explanation 不過

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