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 | [646. Maximum Length of Pair Chain](https://leetcode.com/problems/maximum-length-of-pair-chain/) | [Solution](https://.com/fluency03/leetcode-java/blob/master/src/MaximumLengthOfPairChain646.java) | Medium |
 | [647. Palindromic Substrings](https://leetcode.com/problems/palindromic-substrings/) | [Solution](https://.com/fluency03/leetcode-java/blob/master/src/PalindromicSubstrings647.java) | Medium |
 | [648. Replace Words](https://leetcode.com/problems/replace-words/) | [Solution](https://.com/fluency03/leetcode-java/blob/master/src/ReplaceWords648.java) | Medium |
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 | [652. Find Duplicate Subtrees](https://leetcode.com/problems/find-duplicate-subtrees/) | [Solution](https://.com/fluency03/leetcode-java/blob/master/src/FindDuplicateSubtrees652.java) | Medium |
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 | [653. Two Sum IV - Input is a BST](https://leetcode.com/problems/two-sum-iv-input-is-a-bst/) | [Solution](https://.com/fluency03/leetcode-java/blob/master/src/TwoSumIVInputIsABST653.java) | Easy |
 | [654. Maximum Binary Tree](https://leetcode.com/problems/maximum-binary-tree/) | [Solution](https://.com/fluency03/leetcode-java/blob/master/src/MaximumBinaryTree654.java) | Medium |
 | [657. Judge Route Circle](https://leetcode.com/problems/judge-route-circle/) | [Solution](https://.com/fluency03/leetcode-java/blob/master/src/JudgeRouteCircle657.java) | Easy |