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27 | 27 | |273|[Integer to English Words](https://leetcode.com/problems/integer-to-english-words/)|[Solution]| |
28 | 28 | |257|[Binary Tree Paths](https://leetcode.com/problems/binary-tree-paths/)|[Solution](../../blob/master/EASY/src/easy/BinaryTreePaths.java) | O(n*h) | O(h) | DFS/Recursion |
29 | 29 | |223|[Rectangle Area](https://leetcode.com/problems/rectangle-area/)|[Solution](../../blob/master/EASY/src/easy/RectangleArea.java)| O(1)|O(1)| Easy| |
| 30 | +|219|[Contains Duplicate II](https://leetcode.com/problems/contains-duplicate-ii/)|[Solution](../../blob/master/EASY/src/easy/ContainsDuplicateII.java)| O(n)|O(1) | Easy| HashMap |
30 | 31 | |209|[Minimum Size Subarray Sum](https://leetcode.com/problems/minimum-size-subarray-sum/)|[Solution](../../blob/master/MEDIUM/src/medium/MinimumSizeSubarraySum.java)| O(n)|O(1)| Medium| |
31 | 32 | |206|[Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/)|[Solution](../../blob/master/EASY/src/easy/ReverseLinkedList.java)| O(n)|O(1) | Easy |
32 | 33 | |205|[Isomorphic Strings](https://leetcode.com/problems/isomorphic-strings/)|[Solution](../../blob/master/EASY/src/easy/IsomorphicStrings.java)| O(n)|O(1) | Easy |
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