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55 | 55 | |270|[Closest Binary Search Tree Value](https://leetcode.com/problems/closest-binary-search-tree-value/)|[Solution](../../blob/master/EASY/src/easy/ClosestBinarySearchTreeValue.java)| O(h)|O(1) | Easy| DFS |
56 | 56 | |259|[3Sum Smaller](https://leetcode.com/problems/3sum-smaller/)|[Solution](../../blob/master/MEDIUM/src/medium/_3Sum_Smaller.java)| O(n^2)|O(1)| Medium| |
57 | 57 | |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 |
| 58 | +|252|[Meeting Rooms](https://leetcode.com/problems/meeting-rooms/)|[Solution](../../blob/master/EASY/src/easy/MeetingRooms.java)| O(nlogn)| O(1)| |
58 | 59 | |223|[Rectangle Area](https://leetcode.com/problems/rectangle-area/)|[Solution](../../blob/master/EASY/src/easy/RectangleArea.java)| O(1)|O(1)| Easy| |
59 | 60 | |219|[Contains Duplicate II](https://leetcode.com/problems/contains-duplicate-ii/)|[Solution](../../blob/master/EASY/src/easy/ContainsDuplicateII.java)| O(n)|O(n) | Easy| HashMap |
60 | 61 | |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| |
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