liuchuo / LeetCode

🍡 LeetCode Online Judge刷题题解(Java/C++/Python/Ruby/Swift)

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ID	Title	Difficulty	Java	Python	Ruby	C++	Swift
001	Two Sum	Easy	Java	Python	Ruby	C++	no
002	Add Two Numbers	Medium	Java	Python	Ruby	C++	no
003	Longest Substring Without Repeating Characters	Medium	Java	Python	no	C++	no
005	Longest Palindromic Substring	Medium	no	no	no	C++	no
006	ZigZag Conversion	Easy	Java	Python	no	C++	no
007	Reverse Integer	Easy	Java	Python	Ruby	C++	no
008	String to Integer (atoi)	Easy	Java	no	no	C++	no
009	Palindrome Number	Easy	Java	Python	Ruby	C++	no
010	Regular Expression Matching	Hard	Java	no	no	no	no
011	Container With Most Water	Medium	Java	no	no	C++	no
012	Integer to Roman	Medium	Java	Python	no	C++	no
013	Roman to Integer	Easy	Java	Python	no	C++	no
014	Longest Common Prefix	Easy	Java	Python	no	C++	no
015	3Sum	Medium	Java	Python	Ruby	C++	no
016	3Sum Closest	Medium	Java	no	no	C++	no
017	Letter Combinations of a Phone Number	Medium	Java	Python	no	C++	no
018	4Sum	Medium	Java	no	no	C++	no
019	Remove Nth Node From End of List	Easy	Java	Python	Ruby	C++	no
020	Valid Parentheses	Easy	Java	no	no	C++	Swift
021	Merge Two Sorted Lists	Easy	Java	Python	Ruby	C++	Swift
022	Generate Parentheses	Medium	Java	Python	no	C++	no
023	Merge k Sorted Lists	Hard	Java	Python	Ruby	no	Swift
024	Swap Nodes in Pairs	Easy	Java	Python	no	C++	no
025	Reverse Nodes in k-Group	Hard	Java	no	no	no	no
026	Remove Duplicates from Sorted Array	Easy	Java	Python	no	C++	no
027	Remove Element	Easy	Java	Python	no	C++	no
028	Implement strStr()	Easy	Java	no	no	C++	no
029	Divide Two Integers	Medium	Java	no	no	C++	no
031	Next Permutation	Medium	Java	Python	no	C++	no
032	Longest Valid Parentheses	Hard	Java	no	no	no	no
033	Search in Rotated Sorted Array	Medium	Java	no	no	C++	no
034	Search for a Range	Medium	Java	Python	no	C++	no
035	Search Insert Position	Medium	Java	Python	no	C++	Swift
036	Valid Sudoku	Easy	Java	no	no	C++	no
037	Sudoku Solver	Hard	Java	no	no	no	no
038	Count and Say	Easy	Java	no	no	C++	no
039	Combination Sum	Medium	Java	Python	no	C++	no
040	Combination Sum II	Medium	Java	no	no	C++	no
041	First Missing Positive	Hard	Java	Python	no	no	no
042	Trapping Rain Water	Hard	Java	no	no	C++	no
043	Multiply Strings	Medium	Java	Python	no	C++	no
045	Jump Game II	Hard	Java	no	no	no	no
046	Permutations	Medium	Java	Python	no	C++	no
047	Permutations II	Medium	Java	Python	no	C++	no
048	Rotate Image	Medium	Java	Python	no	C++	no
049	Group Anagrams	Medium	Java	Python	no	C++	Swift
050	Pow(x, n)	Medium	Java	Python	no	no	no
051	N-Queens	Hard	Java	Python	no	C++	no
052	N-Queens II	Hard	Java	Python	no	C++	no
053	Maximum Subarray	Medium	Java	Python	no	C++	no
054	Spiral Matrix	Medium	Java	Python	no	no	no
055	Jump Game	Medium	Java	Python	no	C++	no
056	Merge Intervals	Medium	Java	no	no	C++	no
057	Insert Interval	Hard	Java	Python	no	no	no
058	Length of Last Word	Easy	Java	Python	no	C++	no
059	Spiral Matrix II	Medium	Java	Python	no	C++	no
060	Permutation Sequence	Medium	Java	Python	no	C++	no
061	Rotate List	Medium	Java	Python	no	C++	no
062	Unique Paths	Medium	Java	Python	no	C++	Swift
063	Unique Paths II	Medium	Java	Python	no	C++	no
064	Minimum Path Sum	Medium	Java	Python	no	C++	no
066	Plus One	Easy	Java	no	no	C++	no
067	Add Binary	Easy	Java	Python	no	C++	no
068	Text Justification	Hard	Java	Python	no	no	no
069	Sqrt(x)	Medium	Java	Python	no	C++	no
070	Climbing Stairs	Easy	Java	Python	no	C++	Swift
071	Simplify Path	Medium	no	no	no	C++	no
072	Edit Distance	Hard	Java	Python	no	no	no
073	Set Matrix Zeroes	Medium	Java	Python	no	no	no
074	Search a 2D Matrix	Medium	Java	Python	no	C++	no
075	Sort Colors	Medium	Java	Python	no	C++	Swift
077	Combinations	Medium	Java	Python	no	C++	no
078	Subsets	Medium	Java	Python	no	C++	no
079	Word Search	Medium	Java	no	no	no	no
080	Remove Duplicates from Sorted Array II	Medium	Java	Python	no	C++	no
081	Search in Rotated Sorted Array II	Medium	Java	no	no	no	no
082	Remove Duplicates from Sorted List II	Medium	Java	Python	no	C++	no
083	Remove Duplicates from Sorted List	Easy	Java	Python	no	C++	no
086	Partition List	Medium	Java	Python	no	no	no
087	Scramble String	Hard	Java	Python	no	no	no
088	Merge Sorted Array	Easy	Java	Python	no	C++	no
089	Gray Code	Medium	Java	Python	no	no	no
090	Subsets II	Medium	Java	Python	no	C++	no
091	Decode Ways	Medium	Java	Python	no	C++	no
092	Reverse Linked List II	Medium	Java	no	no	no	no
093	Restore IP Addresses	Medium	Java	Python	no	C++	no
094	Binary Tree Inorder Traversal	Medium	Java	Python	Ruby	C++	Swift
095	Unique Binary Search Trees II	Medium	Java	no	no	no	no
096	Unique Binary Search Trees	Medium	Java	Python	no	C++	Swift
097	Interleaving String	Hard	Java	Python	no	no	no
098	Validate Binary Search Tree	Medium	Java	Python	Ruby	C++	Swift
099	Recover Binary Search Tree	Hard	no	Python	no	no	no
100	Same Tree	Easy	Java	Python	Ruby	C++	Swift
101	Symmetric Tree	Easy	Java	Python	Ruby	C++	Swift
102	Binary Tree Level Order Traversal	Easy	Java	Python	no	C++	Swift
103	Binary Tree Zigzag Level Order Traversal	Medium	Java	Python	no	C++	no
104	Maximum Depth of Binary Tree	Easy	Java	Python	Ruby	C++	Swift
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Java	Python	Ruby	no	no
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	Java	Python	Ruby	no	no
107	Binary Tree Level Order Traversal II	Easy	Java	Python	no	C++	no
108	Convert Sorted Array to Binary Search Tree	Medium	Java	Python	no	C++	no
109	Convert Sorted List to Binary Search Tree	Medium	Java	Python	no	C++	no
110	Balanced Binary Tree	Easy	Java	Python	Ruby	C++	no
111	Minimum Depth of Binary Tree	Easy	Java	Python	Ruby	C++	no
112	Path Sum	Easy	Java	Python	Ruby	C++	no
113	Path Sum II	Medium	Java	Python	no	C++	no
114	Flatten Binary Tree to Linked List	Medium	Java	Python	no	no	Swift
116	Populating Next Right Pointers in Each Node	Medium	Java	Python	no	no	no
117	Populating Next Right Pointers in Each Node II	Hard	Java	Python	no	no	no
118	Pascal's Triangle	Easy	Java	Python	no	C++	no
119	Pascal's Triangle II	Easy	Java	Python	no	C++	no
120	Triangle	Medium	Java	Python	no	C++	no
121	Best Time to Buy and Sell Stock	Easy	Java	no	no	C++	Swift
122	Best Time to Buy and Sell Stock II	Medium	Java	no	no	C++	no
123	Best Time to Buy and Sell Stock III	Hard	Java	no	no	no	no
124	Binary Tree Maximum Path Sum	Hard	Java	no	no	no	no
125	Valid Palindrome	Easy	Java	no	no	C++	no
127	Word Ladder	Medium	Java	no	no	C++	no
128	Longest Consecutive Sequence	Hard	Java	no	no	no	no
129	Sum Root to Leaf Numbers	Medium	Java	Python	no	C++	no
130	Surrounded Regions	Medium	Java	no	no	C++	no
131	Palindrome Partitioning	Medium	Java	no	no	no	no
133	Clone Graph	Medium	Java	Python	no	no	no
134	Gas Station	Medium	Java	Python	no	C++	no
135	Candy	Hard	Java	no	no	no	no
136	Single Number	Easy	Java	Python	no	C++	Swift
137	Single Number II	Medium	Java	no	no	C++	no
138	Copy List with Random Pointer	Hard	Java	Python	no	no	no
139	Word Break	Medium	Java	no	no	no	no
140	Word Break II	Hard	Java	no	no	no	no
141	Linked List Cycle	Easy	Java	Python	no	C++	no
142	Linked List Cycle II	Medium	Java	Python	no	C++	no
143	Reorder List	Medium	Java	Python	no	C++	no
144	Binary Tree Preorder Traversal	Medium	Java	Python	Ruby	C++	no
145	Binary Tree Postorder Traversal	Hard	Java	Python	no	C++	no
146	LRU Cache	Hard	Java	Python	no	no	no
147	Insertion Sort List	Medium	Java	no	no	no	no
148	Sort List	Medium	Java	Python	no	no	Swift
149	Max Points on a Line	Hard	Java	no	no	no	no
150	Evaluate Reverse Polish Notation	Medium	Java	no	no	no	no
151	Reverse Words in a String	Medium	Java	no	no	C++	no
152	Maximum Product Subarray	Medium	Java	no	no	C++	Swift
153	Find Minimum in Rotated Sorted Array	Medium	Java	no	no	C++	no
154	Find Minimum in Rotated Sorted Array II	Hard	Java	no	no	no	no
155	Min Stack	Easy	Java	no	no	C++	no
156	Binary Tree Upside Down	Medium	Java	no	no	no	no
160	Intersection of Two Linked Lists	Easy	Java	Python	no	C++	no
161	One Edit Distance	Medium	Java	no	no	no	no
162	Find Peak Element	Medium	Java	no	no	C++	no
164	Maximum Gap	Hard	Java	no	no	no	no
165	Compare Version Numbers	Easy	Java	Python	no	C++	no
166	Fraction to Recurring Decimal	Medium	Java	no	no	C++	no
167	Two Sum II - Input array is sorted	Medium	Java	no	no	C++	no
168	Excel Sheet Column Title	Easy	Java	Python	no	C++	no
169	Majority Element	Easy	Java	Python	no	C++	Swift
170	Two Sum III - Data structure design	Easy	no	no	no	no	no
171	Excel Sheet Column Number	Easy	Java	Python	no	C++	no
172	Factorial Trailing Zeroes	Easy	Java	Python	no	C++	no
173	Binary Search Tree Iterator	Medium	Java	no	no	no	no
179	Largest Number	Medium	Java	Python	no	C++	no
186	Reverse Words in a String II	Medium	no	no	no	no	no
187	Repeated DNA Sequences	Medium	Java	no	no	no	no
189	Rotate Array	Easy	Java	Python	no	C++	no
190	Reverse Bits	Easy	Java	Python	no	C++	no
191	Number of 1 Bits	Easy	Java	Python	no	C++	no
198	House Robber	Easy	Java	Python	no	C++	Swift
199	Binary Tree Right Side View	Medium	Java	Python	no	C++	no
200	Number of Islands	Medium	Java	Python	no	C++	no
201	Bitwise AND of Numbers Range	Medium	Java	no	no	no	no
202	Happy Number	Easy	Java	Python	no	C++	no
203	Remove Linked List Elements	Easy	Java	Python	no	C++	no
204	Count Primes	Easy	Java	no	no	C++	no
205	Isomorphic Strings	Easy	Java	Python	no	C++	no
206	Reverse Linked List	Easy	Java	Python	no	C++	Swift
207	Course Schedule	Medium	no	no	no	no	no
208	Implement Trie (Prefix Tree)	Medium	Java	no	no	no	no
209	Minimum Size Subarray Sum	Medium	no	no	no	C++	no
212	Word Search II	Hard	Java	no	no	no	no
213	House Robber II	Medium	Java	Python	no	C++	no
215	Kth Largest Element in an Array	Medium	Java	Python	no	C++	Swift
216	Combination Sum III	Medium	Java	Python	no	C++	no
217	Contains Duplicate	Easy	Java	Python	no	C++	no
219	Contains Duplicate II	Easy	Java	Python	no	C++	no
220	Contains Duplicate III	Medium	no	no	no	C++	no
221	Maximal Square	Medium	Java	no	no	no	no
222	Count Complete Tree Nodes	Medium	Java	Python	no	C++	no
223	Rectangle Area	Easy	Java	Python	no	C++	no
225	Implement Stack using Queues	Easy	Java	no	no	C++	no
226	Invert Binary Tree	Easy	Java	Python	Ruby	C++	no
227	Basic Calculator II	Medium	no	no	no	no	no
228	Summary Ranges	Medium	Java	Python	no	C++	no
229	Majority Element II	Medium	Java	no	no	no	no
230	Kth Smallest Element in a BST	Medium	Java	Python	Ruby	C++	no
231	Power of Two	Easy	Java	Python	no	C++	no
232	Implement Queue using Stacks	Easy	Java	no	no	C++	no
234	Palindrome Linked List	Easy	Java	no	no	C++	Swift
235	Lowest Common Ancestor of a Binary Search Tree	Easy	Java	Python	no	C++	no
236	Lowest Common Ancestor of a Binary Tree	Medium	Java	Python	no	no	no
237	Delete Node in a Linked List	Easy	Java	Python	no	C++	no
238	Product of Array Except Self	Medium	Java	Python	no	C++	Swift
239	Sliding Window Maximum	Hard	Java	Python	no	no	no
240	Search a 2D Matrix II	Medium	Java	no	no	C++	no
241	Different Ways to Add Parentheses	Medium	no	no	no	no	no
242	Valid Anagram	Easy	Java	Python	no	C++	no
243	Shortest Word Distance	Easy	no	no	no	no	no
244	Shortest Word Distance II	Medium	no	no	no	no	no
245	Shortest Word Distance III	Medium	no	no	no	no	no
246	Strobogrammatic Number	Easy	no	no	no	no	no
247	Strobogrammatic Number II	Medium	no	no	no	no	no
248	Strobogrammatic Number III	Hard	no	no	no	no	no
249	Group Shifted Strings	Easy	no	no	no	no	no
250	Count Univalue Subtrees	Medium	no	no	no	no	no
251	Flatten 2D Vector	Medium	no	no	no	no	no
252	Meeting Rooms	Easy	no	no	no	no	no
253	Meeting Rooms II	Medium	no	no	no	no	no
254	Factor Combinations	Medium	no	no	no	no	no
255	Verify Preorder Sequence in Binary Search Tree	Medium	no	no	no	no	no
256	Paint House	Medium	no	no	no	no	no
257	Binary Tree Paths	Easy	Java	Python	no	no	no
258	Add Digits	Easy	Java	Python	no	C++	no
259	3Sum Smaller	Medium	no	no	no	no	no
260	Single Number III	Medium	Java	Python	no	C++	no
261	Graph Valid Tree	Medium	no	no	no	no	no
263	Ugly Number	Easy	Java	Python	no	C++	no
264	Ugly Number II	Medium	Java	no	no	no	no
265	Paint House II	Hard	no	no	no	no	no
266	Palindrome Permutation	Easy	no	no	no	no	no
267	Palindrome Permutation II	Medium	no	no	no	no	no
268	Missing Number	Medium	Java	Python	no	C++	no
269	Alien Dictionary	Hard	no	no	no	no	no
270	Closest Binary Search Tree Value	Easy	no	no	no	no	no
271	Encode and Decode Strings	Medium	no	no	no	no	no
272	Closest Binary Search Tree Value II	Hard	no	no	no	no	no
273	Integer to English Words	Hard	Java	Python	no	no	no
274	H-Index	Medium	Java	no	no	no	no
275	H-Index II	Medium	Java	no	no	no	no
276	Paint Fence	Easy	no	no	no	no	no
277	Find the Celebrity	Medium	no	no	no	no	no
278	First Bad Version	Easy	Java	Python	no	C++	no
279	Perfect Squares	Medium	Java	no	no	C++	no
280	Wiggle Sort	Medium	no	no	no	no	no
281	Zigzag Iterator	Medium	no	no	no	no	no
282	Expression Add Operators	Hard	no	no	no	no	no
283	Move Zeroes	Easy	Java	Python	no	C++	Swift
284	Peeking Iterator	Medium	Java	no	no	no	no
285	Inorder Successor in BST	Medium	no	no	no	no	no
286	Walls and Gates	Medium	no	no	no	no	no
287	Find the Duplicate Number	Hard	Java	Python	no	no	Swift
288	Unique Word Abbreviation	Easy	no	no	no	no	no
289	Game of Life	Medium	Java	Python	no	no	no
290	Word Pattern	Easy	Java	Python	no	C++	no
291	Word Pattern II	Hard	no	no	no	no	no
292	Nim Game	Easy	Java	Python	no	C++	no
293	Flip Game	Easy	no	no	no	no	no
294	Flip Game II	Medium	no	no	no	no	no
295	Find Median from Data Stream	Hard	Java	no	no	no	no
296	Best Meeting Point	Hard	no	no	no	no	no
297	Serialize and Deserialize Binary Tree	Hard	Java	no	no	no	no
298	Binary Tree Longest Consecutive Sequence	Medium	no	no	no	no	no
299	Bulls and Cows	Easy	Java	Python	no	C++	no
300	Longest Increasing Subsequence	Medium	Java	no	no	C++	no
301	Remove Invalid Parentheses	Hard	no	no	no	no	no
302	Smallest Rectangle Enclosing Black Pixels	Hard	no	no	no	no	no
303	Range Sum Query - Immutable	Easy	Java	Python	no	C++	no
304	Range Sum Query 2D - Immutable	Medium	no	Python	no	C++	no
305	Number of Islands II	Hard	no	no	no	no	no
306	Additive Number	Medium	Java	Python	no	no	no
307	Range Sum Query - Mutable	Medium	Java	no	no	C++	no
308	Range Sum Query 2D - Mutable	Hard	no	no	no	no	no
309	Best Time to Buy and Sell Stock with Cooldown	Medium	Java	no	no	no	no
310	Minimum Height Trees	Medium	no	no	no	no	no
311	Sparse Matrix Multiplication	Medium	no	no	no	no	no
312	Burst Balloons	Hard	no	no	no	no	no
313	Super Ugly Number	Medium	no	no	no	no	no
314	Binary Tree Vertical Order Traversal	Medium	no	no	no	no	no
315	Count of Smaller Numbers After Self	Hard	Java	Python	no	no	no
316	Remove Duplicate Letters	Hard	Java	no	no	no	no
317	Shortest Distance from All Buildings	Hard	no	no	no	no	no
318	Maximum Product of Word Lengths	Medium	Java	Python	no	C++	no
319	Bulb Switcher	Medium	Java	Python	no	C++	no
320	Generalized Abbreviation	Medium	no	no	no	no	no
321	Create Maximum Number	Hard	no	no	no	no	no
322	Coin Change	Medium	Java	no	no	C++	no
323	Number of Connected Components in an Undirected Graph	Medium	no	no	no	no	no
324	Wiggle Sort II	Medium	no	Python	no	C++	no
325	Maximum Size Subarray Sum Equals k	Medium	no	no	no	no	no
326	Power of Three	Easy	Java	Python	no	C++	no
327	Count of Range Sum	Hard	no	no	no	no	no
328	Odd Even Linked List	Medium	Java	Python	no	C++	no
329	Longest Increasing Path in a Matrix	Hard	Java	Python	no	no	no
330	Patching Array	Hard	no	no	no	C++	no
331	Verify Preorder Serialization of a Binary Tree	Medium	Java	Python	no	no	no
332	Reconstruct Itinerary	Medium	no	no	no	no	no
333	Largest BST Subtree	Medium	no	no	no	no	no
334	Increasing Triplet Subsequence	Medium	Java	Python	no	no	no
335	Self Crossing	Hard	no	no	no	no	no
336	Palindrome Pairs	Hard	no	no	no	no	no
337	House Robber III	Medium	Java	Python	no	no	no
338	Counting Bits	Medium	Java	Python	no	C++	Swift
339	Nested List Weight Sum	Easy	no	no	no	no	no
340	Longest Substring with At Most K Distinct Characters	Hard	no	no	no	no	no
341	Flatten Nested List Iterator	Medium	Java	Python	no	no	no
342	Power of Four	Easy	Java	Python	no	no	no
343	Integer Break	Medium	Java	Python	no	C++	no
344	Reverse String	Easy	Java	Python	no	C++	no
345	Reverse Vowels of a String	Easy	Java	Python	no	C++	no
346	Moving Average from Data Stream	Easy	no	no	no	no	no
347	Top K Frequent Elements	Medium	Java	Python	no	C++	Swift
348	Design Tic-Tac-Toe	Medium	no	no	no	no	no
349	Intersection of Two Arrays	Easy	Java	no	no	C++	no
350	Intersection of Two Arrays II	Easy	Java	no	no	C++	no
351	Android Unlock Patterns	Medium	no	no	no	no	no
352	Data Stream as Disjoint Intervals	Hard	Java	no	no	no	no
353	Design Snake Game	Medium	no	no	no	no	no
354	Russian Doll Envelopes	Hard	Java	no	no	no	no
355	Design Twitter	Medium	Java	no	no	no	no
356	Line Reflection	Medium	no	no	no	no	no
357	Count Numbers with Unique Digits	Medium	Java	no	no	C++	no
358	Rearrange String k Distance Apart	Hard	no	no	no	no	no
359	Logger Rate Limiter	Easy	no	no	no	no	no
360	Sort Transformed Array	Medium	no	no	no	no	no
361	Bomb Enemy	Medium	no	no	no	no	no
362	Design Hit Counter	Medium	no	no	no	no	no
363	Max Sum of Rectangle No Larger Than K	Hard	Java	no	no	no	no
364	Nested List Weight Sum II	Medium	no	no	no	no	no
365	Water and Jug Problem	Medium	Java	no	no	C++	no
366	Find Leaves of Binary Tree	Medium	no	no	no	no	no
367	Valid Perfect Square	Medium	Java	no	no	C++	no
368	Largest Divisible Subset	Medium	Java	no	no	no	no
369	Plus One Linked List	Medium	no	no	no	no	no
370	Range Addition	Medium	no	no	no	no	no
371	Sum of Two Integers	Easy	Java	no	no	C++	no
372	Super Pow	Medium	Java	no	no	no	no
373	Find K Pairs with Smallest Sums	Medium	Java	no	no	no	no
374	Guess Number Higher or Lower	Easy	Java	no	no	C++	no
375	Guess Number Higher or Lower II	Medium	Java	no	no	no	no
376	Wiggle Subsequence	Medium	Java	no	no	no	no
377	Combination Sum IV	Medium	Java	no	no	C++	no
378	Kth Smallest Element in a Sorted Matrix	Medium	Java	no	no	C++	no
379	Design Phone Directory	Medium	no	no	no	no	no
380	Insert Delete GetRandom O(1)	Hard	Java	no	no	no	no
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	Java	no	no	no	no
382	Linked List Random Node	Medium	Java	no	no	C++	no
383	Ransom Note	Easy	Java	no	no	C++	no
384	Shuffle an Array	Medium	Java	no	no	C++	no
385	Mini Parser	Medium	Java	no	no	no	no
386	Lexicographical Numbers	Medium	Java	no	no	no	no
387	First Unique Character in a String	Easy	Java	no	no	C++	no
388	Longest Absolute File Path	Medium	Java	no	no	no	no
389	Find the Difference	Easy	Java	no	no	C++	no
390	Elimination Game	Medium	Java	no	no	no	no
391	Perfect Rectangle	Hard	Java	no	no	no	no
392	Is Subsequence	Medium	Java	no	no	C++	no
393	UTF-8 Validation	Medium	Java	no	no	no	no
394	Decode String	Medium	Java	no	no	no	Swift
395	Longest Substring with At Least K Repeating Characters	Medium	Java	no	no	no	no
396	Rotate Function	Easy	Java	no	no	C++	no
397	Integer Replacement	Medium	Java	no	no	no	no
398	Random Pick Index	Medium	Java	no	no	C++	no
399	Evaluate Division	Medium	no	no	no	no	no
400	Nth Digit	Easy	Java	no	no	C++	no
401	Binary Watch	Easy	Java	no	no	C++	no
402	Remove K Digits	Medium	Java	no	no	C++	no
403	Frog Jump	Hard	Java	no	no	no	no
404	Sum of Left Leaves	Easy	Java	no	no	C++	no
405	Convert a Number to Hexadecimal	Easy	Java	no	no	C++	no
406	Queue Reconstruction by Height	Medium	Java	no	no	C++	no
407	Trapping Rain Water II	Hard	no	no	no	no	no
408	Valid Word Abbreviation	Easy	no	no	no	no	no
409	Longest Palindrome	Easy	Java	no	no	C++	no
410	Split Array Largest Sum	Hard	no	no	no	no	no
411	Minimum Unique Word Abbreviation	Hard	no	no	no	no	no
412	Fizz Buzz	Easy	no	no	no	C++	no
413	Arithmetic Slices	Medium	no	no	no	C++	no
415	Add Strings	Easy	Java	no	no	C++	no
416	Partition Equal Subset Sum	Medium	Java	no	no	no	no
417	Pacific Atlantic Water Flow	Medium	Java	no	no	no	no
418	Sentence Screen Fitting	Medium	no	no	no	no	no
419	Battleships in a Board	Medium	no	no	no	C++	no
423	Reconstruct Original Digits from English	Medium	no	no	no	C++	no
434	Number of Segments in a String	Easy	no	no	no	C++	no
437	Path Sum III	Easy	no	no	no	C++	Swift
438	Find All Anagrams in a String	Easy	no	no	no	C++	Swift
441	Arranging Coins	Easy	no	no	no	C++	no
442	Find All Duplicates in an Array	Medium	no	no	no	C++	no
443	String Compression	Easy	no	no	no	C++	no
445	Add Two Numbers II	Medium	no	no	no	C++	no
447	Number of Boomerangs	Easy	no	no	no	C++	no
448	Find All Numbers Disappeared in an Array	Easy	no	no	no	C++	Swift
451	Sort Characters By Frequency	Medium	no	no	no	C++	no
453	Minimum Moves to Equal Array Elements	Easy	no	no	no	C++	no
454	4Sum II	Medium	no	no	no	C++	no
455	Assign Cookies	Easy	no	no	no	C++	no
459	Repeated Substring Pattern	Easy	no	no	no	C++	no
461	Hamming Distance	Easy	no	no	no	C++	Swift
462	Minimum Moves to Equal Array Elements II	Medium	no	no	no	C++	no
463	Island Perimeter	Easy	no	no	no	C++	no
464	Can I Win	Medium	no	no	no	C++	no
468	Validate IP Address	Medium	no	no	no	C++	no
475	Heaters	Easy	no	no	no	C++	no
476	Number Complement	Easy	no	no	no	C++	no
477	Total Hamming Distance	Medium	no	no	no	C++	no
479	Largest Palindrome Product	Easy	no	no	no	C++	no
481	Magical String	Medium	no	no	no	C++	no
482	License Key Formatting	Medium	no	no	no	C++	no
485	Max Consecutive Ones	Easy	no	no	no	C++	no
486	Predict the Winner	Medium	no	no	no	C++	no
491	Increasing Subsequences	Medium	no	no	no	C++	no
492	Construct the Rectangle	Medium	no	no	no	C++	no
494	Target Sum	Medium	no	no	no	C++	no
495	Teemo Attacking	Medium	no	no	no	C++	no
496	Next Greater Element I	Easy	no	no	no	C++	no
498	Diagonal Traverse	Medium	no	no	no	C++	no
500	Keyboard Row	Easy	no	no	no	C++	no
501	Find Mode in Binary Search Tree	Medium	no	no	no	C++	no
503	Next Greater Element II	Medium	no	no	no	C++	no
504	Base 7	Easy	no	no	no	C++	no
506	Relative Ranks	Easy	no	no	no	C++	no
507	Perfect Number	Easy	no	no	no	C++	no
508	Most Frequent Subtree Sum	Medium	no	no	no	C++	no
513	Find Bottom Left Tree Value	Medium	no	no	no	C++	no
515	Find Largest Value in Each Tree Row	Medium	no	no	no	C++	no
516	Longest Palindromic Subsequence	Medium	no	no	no	C++	no
521	Longest Uncommon Subsequence I	Easy	no	no	no	C++	no
532	K-diff Pairs in an Array	Easy	no	no	no	C++	no
537	Complex Number Multiplication	Medium	no	no	no	C++	no
538	Convert BST to Greater Tree	Easy	no	no	no	C++	Swift
541	Reverse String II	Easy	no	no	no	C++	no
543	Diameter of Binary Tree	Easy	no	no	no	C++	Swift
547	Friend Circles	Medium	no	no	no	C++	no
551	Student Attendance Record I	Easy	no	no	no	C++	no
553	Optimal Division	Medium	no	no	no	C++	no
561	Array Partition I	Easy	no	no	no	C++	no
563	Binary Tree Tilt	Easy	no	no	no	C++	no
566	Reshape the Matrix	Easy	no	no	no	C++	no
572	Subtree of Another Tree	Easy	no	no	no	C++	Swift
575	Distribute Candies	Easy	no	no	no	C++	no
581	Shortest Unsorted Continuous Subarray	Easy	no	no	no	C++	Swift
599	Minimum Index Sum of Two Lists	Easy	no	no	no	C++	no
617	Merge Two Binary Trees	Easy	no	no	no	no	Swift
628	Maximum Product of Three Numbers	Easy	no	no	no	C++	no
633	Sum of Square Numbers	Easy	no	no	no	C++	no
637	Average of Levels in Binary Tree	Easy	no	no	no	C++	no
643	Maximum Average Subarray I	Easy	no	no	no	C++	no
650	2 Keys Keyboard	Medium	no	no	no	C++	no
653	Two Sum IV - Input is a BST	Easy	no	no	no	C++	no
654	Maximum Binary Tree	Medium	no	no	no	C++	no
655	Print Binary Tree	Medium	no	no	no	C++	no
657	Judge Route Circle	Easy	no	no	no	C++	Swift
671	Second Minimum Node In a Binary Tree	Easy	no	no	no	C++	no
674	Longest Continuous Increasing Subsequence	Easy	no	no	no	C++	no
695	Max Area of Island	Easy	no	no	no	C++	Swift
709	To Lower Case	Easy	no	no	no	no	Swift
717	1-bit and 2-bit Characters	Easy	no	no	no	C++	no
724	Find Pivot Index	Easy	no	no	no	C++	no
728	Self Dividing Numbers	Easy	no	no	no	C++	no
733	Flood Fill	Easy	no	no	no	C++	no
739	Daily Temperatures	Medium	no	no	no	C++	no
740	Delete and Earn	Medium	no	no	no	C++	no
744	Find Smallest Letter Greater Than Target	Easy	no	no	no	C++	no
746	Min Cost Climbing Stairs	Easy	no	no	no	C++	no
747	Largest Number At Least Twice of Others	Easy	no	no	no	C++	no
760	Find Anagram Mappings	Easy	no	no	no	C++	no
762	Prime Number of Set Bits in Binary Representation	Easy	no	no	no	C++	no
763	Partition Labels	Medium	no	no	no	C++	no
766	Toeplitz Matrix	Easy	no	no	no	C++	no
768	Max Chunks To Make Sorted II	Hard	no	no	no	C++	no
769	Max Chunks To Make Sorted	Medium	no	no	no	C++	no
771	Jewels and Stones	Easy	no	no	no	C++	Swift
775	Global and Local Inversions	Medium	no	no	no	C++	no
779	K-th Symbol in Grammar	Medium	no	no	no	C++	no
804	Unique Morse Code Words	Easy	no	no	no	no	Swift
832	Flipping an Image	Easy	no	no	no	no	Swift