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ID	Title	Difficulty	Java	Python	C++	Swift
001	Two Sum	Easy	Java	Python	C++	no
002	Add Two Numbers	Medium	Java	Python	C++	no
003	Longest Substring Without Repeating Characters	Medium	Java	Python	C++	no
004	Median of Two Sorted Arrays	Hard
005	Longest Palindromic Substring	Medium	no	no	C++	no
010	Regular Expression Matching	Hard	Java	no	no	no
011	Container With Most Water	Medium	Java	no	C++	no
015	3Sum	Medium	Java	Python	C++	no
017	Letter Combinations of a Phone Number	Medium	Java	Python	C++	no
019	Remove Nth Node From End of List	Easy	Java	Python	C++	no
020	Valid Parentheses	Easy	Java	no	C++	Swift
021	Merge Two Sorted Lists	Easy	Java	Python	C++	Swift
022	Generate Parentheses	Medium	Java	Python	C++	no
023	Merge k Sorted Lists	Hard	Java	Python	no	Swift
032	Longest Valid Parentheses	Hard	Java	no	no	no
033	Search in Rotated Sorted Array	Medium	Java	no	C++	no
034	Search for a Range	Medium	Java	Python	C++	no
035	Search Insert Position	Medium	Java	Python	C++	Swift
039	Combination Sum	Medium	Java	Python	C++	no
042	Trapping Rain Water	Hard	Java	no	C++	no
046	Permutations	Medium	Java	Python	C++	no
048	Rotate Image	Medium	Java	Python	C++	no
049	Group Anagrams	Medium	Java	Python	C++	Swift
053	Maximum Subarray	Medium	Java	Python	C++	no
055	Jump Game	Medium	Java	Python	C++	no
056	Merge Intervals	Medium	Java	no	C++	no
062	Unique Paths	Medium	Java	Python	C++	Swift
064	Minimum Path Sum	Medium	Java	Python	C++	no
070	Climbing Stairs	Easy	Java	Python	C++	Swift
072	Edit Distance	Hard	Java	Python	no	no
075	Sort Colors	Medium	Java	Python	C++	Swift
076	Minimum Window Substring	Hard
078	Subsets	Medium	Java	Python	C++	no
079	Word Search	Medium	Java	no	no	no
084	Largest Rectangle in Histogram	Hard
085	Maximal Rectangle	Hard
094	Binary Tree Inorder Traversal	Medium	Java	Python	C++	Swift
096	Unique Binary Search Trees	Medium	Java	Python	C++	Swift
098	Validate Binary Search Tree	Medium	Java	Python	C++	Swift
100	Same Tree	Easy	Java	Python	C++	Swift
101	Symmetric Tree	Easy	Java	Python	C++	Swift
102	Binary Tree Level Order Traversal	Easy	Java	Python	C++	Swift
104	Maximum Depth of Binary Tree	Easy	Java	Python	C++	Swift
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Java	Python	no	no
114	Flatten Binary Tree to Linked List	Medium	Java	Python	no	Swift
121	Best Time to Buy and Sell Stock	Easy	Java	no	C++	Swift
124	Binary Tree Maximum Path Sum	Hard	Java	no	no	no
128	Longest Consecutive Sequence	Hard	Java	no	no	no
136	Single Number	Easy
139	Word Break	Medium	Java	no	no	no
141	Linked List Cycle	Easy	Java	Python	C++	no
142	Linked List Cycle II	Medium	Java	Python	C++	no
146	LRU Cache	Hard	Java	Python	no	no
148	Sort List	Medium	Java	Python	no	Swift
152	Maximum Product Subarray	Medium	Java	no	C++	Swift
155	Min Stack	Easy	Java	no	C++	no
160	Intersection of Two Linked Lists	Easy	Java	Python	C++	no
169	Majority Element	Easy	Java	Python	C++	Swift
198	House Robber	Easy	Java	Python	C++	Swift
200	Number of Islands	Medium	Java	Python	C++	no
206	Reverse Linked List	Easy	Java	Python	C++	Swift
207	Course Schedule	Medium	no	no	no	no
208	Implement Trie (Prefix Tree)	Medium	Java	no	no	no
215	Kth Largest Element in an Array	Medium	Java	Python	C++	Swift
218	Subarray Sum Equals K	Hard
221	Maximal Square	Medium	Java	no	no	no
226	Invert Binary Tree	Easy	Java	Python	C++	no
234	Palindrome Linked List	Easy	Java	no	C++	Swift
236	Lowest Common Ancestor of a Binary Tree	Medium	Java	Python	no	no
238	Product of Array Except Self	Medium	Java	Python	C++	Swift
239	Sliding Window Maximum	Hard	Java	Python	no	no
240	Search a 2D Matrix II	Medium	Java	no	C++	no
279	Perfect Squares	Medium	Java	no	C++	no
283	Move Zeroes	Easy	Java	Python	C++	Swift
287	Find the Duplicate Number	Hard	Java	Python	no	Swift
297	Serialize and Deserialize Binary Tree	Hard	Java	no	no	no
300	Longest Increasing Subsequence	Medium	Java	no	C++	no
309	Best Time to Buy and Sell Stock with Cooldown	Medium	Java	no	no	no
312	Burst Balloons	Hard	no	no	no	no
322	Coin Change	Medium	Java	no	C++	no
337	House Robber III	Medium	Java	Python	no	no
338	Counting Bits	Medium	Java	Python	C++	Swift
347	Top K Frequent Elements	Medium	Java	Python	C++	Swift
394	Decode String	Medium	Java	no	no	Swift
406	Queue Reconstruction by Height	Medium	Java	no	C++	no
416	Partition Equal Subset Sum	Medium	Java	no	no	no
437	Path Sum III	Easy	no	no	C++	Swift
438	Find All Anagrams in a String	Easy	no	no	C++	Swift
448	Find All Numbers Disappeared in an Array	Easy	no	no	C++	Swift
461	Hamming Distance	Easy	no	no	C++	Swift
494	Target Sum	Medium	no	no	C++	no
538	Convert BST to Greater Tree	Easy	no	no	C++	Swift
543	Diameter of Binary Tree	Easy	no	no	C++	Swift
560	Subarray Sum Equals K	Medium
572	Subtree of Another Tree	Easy	no	no	C++	Swift
581	Shortest Unsorted Continuous Subarray	Easy	no	no	C++	Swift
617	Merge Two Binary Trees	Easy	no	no	no	Swift
621	Task Scheduler	Medium
647	Palindromic Substrings	Medium
695	Max Area of Island	Easy	no	no	C++	Swift