LeetCode题解

#	Title	通过率	简易程度
1	Two Sum	17.70%	Medium
2	Add Two Numbers	21.10%	Medium
3	Longest Substring Without Repeating Characters	20.60%	Medium
4	Median of Two Sorted Arrays	17.40%	Hard
5	Longest Palindromic Substring	20.70%	Medium
6	ZigZag Conversion	21.80%	Easy
7	Reverse Integer	25.10%	Easy
8	String to Integer (atoi)	13.00%	Easy
9	Palindrome Number	28.30%	Easy
10	Regular Expression Matching	20.70%	Hard
11	Container With Most Water	32.00%	Medium
12	Integer to Roman	33.80%	Medium
13	Roman to Integer	34.00%	Easy
14	Longest Common Prefix	25.50%	Easy
15	3Sum	16.90%	Medium
16	3Sum Closest	26.90%	Medium
17	Letter Combinations of a Phone Number	25.80%	Medium
18	4Sum	21.70%	Medium
19	Remove Nth Node From End of List	27.10%	Easy
20	Valid Parentheses	26.50%	Easy
21	Merge Two Sorted Lists	32.70%	Easy
22	Generate Parentheses	32.60%	Medium
23	Merge k Sorted Lists	21.10%	Hard
24	Swap Nodes in Pairs	32.50%	Medium
25	Reverse Nodes in k-Group	25.50%	Hard
26	Remove Duplicates from Sorted Array	31.30%	Easy
27	Remove Element	32.10%	Easy
28	Implement strStr()	22.20%	Easy
29	Divide Two Integers	15.00%	Medium
30	Substring with Concatenation of All Words	19.40%	Hard
31	Next Permutation	25.00%	Medium
32	Longest Valid Parentheses	20.90%	Hard
33	Search in Rotated Sorted Array	28.80%	Hard
34	Search for a Range	27.50%	Medium
35	Search Insert Position	35.40%	Medium
36	Valid Sudoku	27.20%	Easy
37	Sudoku Solver	21.80%	Hard
38	Count and Say	25.20%	Easy
39	Combination Sum	27.90%	Medium
40	Combination Sum II	25.20%	Medium
41	First Missing Positive	22.90%	Hard
42	Trapping Rain Water	30.00%	Hard
43	Multiply Strings	21.00%	Medium
44	Wildcard Matching	15.00%	Hard
45	Jump Game II	24.20%	Hard
46	Permutations	31.90%	Medium
47	Permutations II	25.80%	Hard
48	Rotate Image	31.90%	Medium
49	Anagrams	24.30%	Medium
50	Pow(x, n)	26.70%	Medium
51	N-Queens	26.50%	Hard
52	N-Queens II	35.80%	Hard
53	Maximum Subarray	34.50%	Medium
54	Spiral Matrix	20.80%	Medium
55	Jump Game	27.00%	Medium
56	Merge Intervals	22.40%	Hard
57	Insert Interval	21.40%	Hard
58	Length of Last Word	28.00%	Easy
59	Spiral Matrix II	31.80%	Medium
60	Permutation Sequence	22.80%	Medium
61	Rotate List	21.70%	Medium
62	Unique Paths	32.80%	Medium
63	Unique Paths II	28.00%	Medium
64	Minimum Path Sum	32.20%	Medium
65	Valid Number	11.40%	Hard
66	Plus One	30.40%	Easy
67	Add Binary	24.70%	Easy
68	Text Justification	14.60%	Hard
69	Sqrt(x)	23.10%	Medium
70	Climbing Stairs	34.40%	Easy
71	Simplify Path	20.00%	Medium
72	Edit Distance	26.20%	Hard
73	Set Matrix Zeroes	31.40%	Medium
74	Search a 2D Matrix	31.60%	Medium
75	Sort Colors	32.60%	Medium
76	Minimum Window Substring	18.90%	Hard
77	Combinations	30.90%	Medium
78	Subsets	28.20%	Medium
79	Word Search	20.30%	Medium
80	Remove Duplicates from Sorted Array II	30.50%	Medium
81	Search in Rotated Sorted Array II	31.40%	Medium
82	Remove Duplicates from Sorted List II	25.00%	Medium
83	Remove Duplicates from Sorted List	34.50%	Easy
84	Largest Rectangle in Histogram	22.60%	Hard
85	Maximal Rectangle	22.00%	Hard
86	Partition List	27.50%	Medium
87	Scramble String	24.20%	Hard
88	Merge Sorted Array	29.70%	Easy
89	Gray Code	32.80%	Medium
90	Subsets II	27.70%	Medium
91	Decode Ways	16.40%	Medium
92	Reverse Linked List II	26.10%	Medium
93	Restore IP Addresses	21.00%	Medium
94	Binary Tree Inorder Traversal	36.20%	Medium
95	Unique Binary Search Trees II	28.00%	Medium
96	Unique Binary Search Trees	36.00%	Medium
97	Interleaving String	20.80%	Hard
98	Validate Binary Search Tree	20.60%	Medium
99	Recover Binary Search Tree	24.30%	Hard
100	Same Tree	41.80%	Easy
101	Symmetric Tree	31.60%	Easy
102	Binary Tree Level Order Traversal	29.30%	Easy
103	Binary Tree Zigzag Level Order Traversal	26.40%	Medium
104	Maximum Depth of Binary Tree	45.10%	Easy
105	Construct Binary Tree from Preorder and Inorder Traversal	26.40%	Medium
106	Construct Binary Tree from Inorder and Postorder Traversal	26.80%	Medium
107	Binary Tree Level Order Traversal II	31.10%	Easy
108	Convert Sorted Array to Binary Search Tree	34.00%	Medium
109	Convert Sorted List to Binary Search Tree	27.90%	Medium
110	Balanced Binary Tree	32.00%	Easy
111	Minimum Depth of Binary Tree	29.10%	Easy
112	Path Sum	29.80%	Easy
113	Path Sum II	26.60%	Medium
114	Flatten Binary Tree to Linked List	28.80%	Medium
115	Distinct Subsequences	26.30%	Hard
116	Populating Next Right Pointers in Each Node	36.20%	Medium
117	Populating Next Right Pointers in Each Node II	32.00%	Hard
118	Pascal's Triangle	30.10%	Easy
119	Pascal's Triangle II	29.40%	Easy
120	Triangle	27.40%	Medium
121	Best Time to Buy and Sell Stock	32.60%	Medium
122	Best Time to Buy and Sell Stock II	38.30%	Medium
123	Best Time to Buy and Sell Stock III	23.90%	Hard
124	Binary Tree Maximum Path Sum	21.50%	Hard
125	Valid Palindrome	22.00%	Easy
126	Word Ladder II	12.90%	Hard
127	Word Ladder	19.30%	Medium
128	Longest Consecutive Sequence	29.40%	Hard
129	Sum Root to Leaf Numbers	30.30%	Medium
130	Surrounded Regions	14.60%	Medium
131	Palindrome Partitioning	26.70%	Medium
132	Palindrome Partitioning II	19.70%	Hard
133	Clone Graph	24.00%	Medium
134	Gas Station	25.70%	Medium
135	Candy	20.50%	Hard
136	Single Number	45.10%	Medium
137	Single Number II	35.00%	Medium
138	Copy List with Random Pointer	25.10%	Hard
139	Word Break	23.00%	Medium
140	Word Break II	17.70%	Hard
141	Linked List Cycle	36.30%	Medium
142	Linked List Cycle II	31.40%	Medium
143	Reorder List	21.00%	Medium
144	Binary Tree Preorder Traversal	36.30%	Medium
145	Binary Tree Postorder Traversal	32.40%	Hard
146	LRU Cache	15.00%	Hard
147	Insertion Sort List	26.40%	Medium
148	Sort List	22.00%	Medium
149	Max Points on a Line	12.60%	Hard
150	Evaluate Reverse Polish Notation	21.10%	Medium
151	Reverse Words in a String	15.10%	Medium
152	Maximum Product Subarray	19.40%	Medium
153	Find Minimum in Rotated Sorted Array	33.30%	Medium
154	Find Minimum in Rotated Sorted Array II	31.90%	Hard
155	Min Stack	18.50%	Easy
156	Binary Tree Upside Down $	34.30%	Medium
157	Read N Characters Given Read4 $	29.80%	Easy
158	Read N Characters Given Read4 II - Call multiple times $	22.30%	Hard
159	Longest Substring with At Most Two Distinct Characters $	30.20%	Hard
160	Intersection of Two Linked Lists	28.70%	Easy
161	One Edit Distance $	24.00%	Medium
162	Find Peak Element	31.50%	Medium
163	Missing Ranges $	24.10%	Medium
164	Maximum Gap	24.40%	Hard
165	Compare Version Numbers	15.20%	Easy
166	Fraction to Recurring Decimal	12.70%	Medium
167	Two Sum II - Input array is sorted $	43.30%	Medium
168	Excel Sheet Column Title	18.10%	Easy
169	Majority Element	35.00%	Easy
170	Two Sum III - Data structure design $	24.70%	Easy
171	Excel Sheet Column Number	36.50%	Easy
172	Factorial Trailing Zeroes	28.40%	Easy
173	Binary Search Tree Iterator	29.30%	Medium
174	Dungeon Game	17.70%	Hard
175	Combine Two Tables *	34.40%	Easy
176	Second Highest Salary *	25.00%	Easy
177	Nth Highest Salary *	16.30%	Medium
178	Rank Scores *	24.60%	Medium
179	Largest Number	15.70%	Medium
180	Consecutive Numbers *	26.60%	Medium
181	Employees Earning More Than Their Managers *	41.00%	Easy
182	Duplicate Emails *	38.10%	Easy
183	Customers Who Never Order *	33.70%	Easy
184	Department Highest Salary *	19.00%	Medium
185	Department Top Three Salaries *	15.20%	Hard
186	Reverse Words in a String II $	31.10%	Medium
187	Repeated DNA Sequences	19.50%	Medium
188	Best Time to Buy and Sell Stock IV	17.30%	Hard
189	Rotate Array	17.80%	Easy
190	Reverse Bits	28.40%	Easy
191	Number of 1 Bits	37.30%	Easy
192	Word Frequency #	26.10%	Medium
193	Valid Phone Numbers #	24.40%	Easy
194	Transpose File #	21.40%	Medium
195	Tenth Line #	32.20%	Easy
196	Delete Duplicate Emails *	19.00%	Easy
197	Rising Temperature *	25.90%	Easy
198	House Robber	28.80%	Easy
199	Binary Tree Right Side View	27.10%	Medium
200	Number of Islands	21.90%	Medium
201	Bitwise AND of Numbers Range	23.30%	Medium
202	Happy Number	31.40%	Easy
203	Remove Linked List Elements	25.80%	Easy
204	Count Primes	19.00%	Easy
205	Isomorphic Strings	24.20%	Easy
206	Reverse Linked List	31.50%	Easy
207	Course Schedule	21.70%	Medium
208	Implement Trie (Prefix Tree)	24.80%	Medium
209	Minimum Size Subarray Sum	22.90%	Medium
210	Course Schedule II	19.30%	Medium
211	Add and Search Word - Data structure design	20.70%	Medium
212	Word Search II	15.00%	Hard
213	House Robber II	26.30%	Medium
214	Shortest Palindrome	16.80%	Hard
215	Kth Largest Element in an Array	27.30%	Medium
216	Combination Sum III	27.70%	Medium
217	Contains Duplicate	35.90%	Easy
218	The Skyline Problem	16.20%	Hard
219	Contains Duplicate II	25.60%	Easy
220	Contains Duplicate III	15.30%	Medium
221	Maximal Square	20.30%	Medium
222	Count Complete Tree Nodes	19.40%	Medium
223	Rectangle Area	25.60%	Easy
224	Basic Calculator	15.80%	Medium
225	Implement Stack using Queues	29.60%	Medium
226	Invert Binary Tree	35.40%	Easy
227	Basic Calculator II	18.00%	Medium
228	Summary Ranges	21.10%	Easy
229	Majority Element II	30.50%	Medium
230	Kth Smallest Element in a BST	30.50%	Medium
231	Power of Two	31.30%	Easy
232	Implement Queue using Stacks	37.40%	Easy
233	Number of Digit One	16.10%	Medium
234	Palindrome Linked List	23.80%	Easy
235	Lowest Common Ancestor of a Binary Search Tree	38.90%	Medium
236	Lowest Common Ancestor of a Binary Tree	28.30%	Medium
237	Delete Node in a Linked List	50.90%	Easy
238	Product of Array Except Self	42.40%	Medium
239	Sliding Window Maximum	24.30%	Hard
240	Search a 2D Matrix II	31.40%	Medium
241	Different Ways to Add Parentheses	27.10%	Medium
242	Valid Anagram	39.30%	Easy
243	Shortest Word Distance $	41.80%	Easy
244	Shortest Word Distance II $	33.70%	Medium
245	Shortest Word Distance III $	43.20%	Medium
246	Strobogrammatic Number $	31.60%	Easy
247	Strobogrammatic Number II $	26.70%	Medium
248	Strobogrammatic Number III $	21.80%	Hard
249	Group Shifted Strings $	25.20%	Easy
250	Count Univalue Subtrees $	32.70%	Medium
251	Flatten 2D Vector $	28.30%	Medium
252	Meeting Rooms $	35.40%	Easy
253	Meeting Rooms II $	28.80%	Medium
254	Factor Combinations $	29.00%	Medium
255	Verify Preorder Sequence in Binary Search Tree $	32.30%	Medium
256	Paint House $	38.40%	Medium
257	Binary Tree Paths	21.90%	Easy
258	Add Digits	46.50%	Easy
259	3Sum Smaller $	34.20%	Medium
260	Single Number III	37.60%	Medium
261	Graph Valid Tree $	25.40%	Medium
262	Trips and Users *	16.10%	Hard
263	Ugly Number	32.6%	Easy
264	Ugly Number II	21.60%	Medium
265	Paint House II $	30.00%	Hard
266	Palindrome Permutation $	45.80%	Easy
267	Palindrome Permutation II $	22.50%	Medium
268	Missing Number	34.70%	Medium
269	Alien Dictionary $	16.50%	Hard
270	Closest Binary Search Tree Value $	29.40%	Easy
271	Encode and Decode Strings $	25.40%	Medium
272	Closest Binary Search Tree Value II $	26.90%	Hard
273	Integer to English Words	15.50%	Medium
274	H-Index	25.30%	Medium
275	H-Index II	31.40%	Medium
276	Paint Fence $	25.00%	Easy
277	Find the Celebrity $	31.70%	Medium
278	First Bad Version	19.80%	Easy
279	Perfect Squares	28.80%	Medium
280	Wiggle Sort $	43.30%	Medium
281	Zigzag Iterator $	37.20%	Medium
282	Expression Add Operators	18.90%	Hard
283	Move Zeroes	41.40%	Easy
284	Peeking Iterator	31.00%	Medium
285	Inorder Successor in BST $	32.50%	Medium
286	Walls and Gates $	29.90%	Medium
287	Find the Duplicate Number	32.80%	Hard
288	Unique Word Abbreviation $	16.80%	Easy
289	Game of Life	32.60%	Medium
290	Word Pattern	26.50%	Easy
291	Word Pattern II $	31.50%	Hard
292	Nim Game	49.50%	Easy
293	Flip Game $	47.60%	Easy
294	Flip Game II $	38.10%	Medium
295	Find Median from Data Stream	18.60%	Hard
296	Best Meeting Point $	41.40%	Hard
297	Serialize and Deserialize Binary Tree	23.80%	Medium
298	Binary Tree Longest Consecutive Sequence $	32.20%	Medium
299	Bulls and Cows	23.80%	Easy
300	Longest Increasing Subsequence	31.50%	Medium
301	Remove Invalid Parentheses	27.00%	Hard
302	Smallest Rectangle Enclosing Black Pixels $	36.70%	Hard
303	Range Sum Query - Immutable	25.70%	Easy
304	Range Sum Query 2D - Immutable	21.50%	Medium
305	Number of Islands II $	26.70%	Hard
306	Additive Number	23.30%	Medium
307	Range Sum Query - Mutable	14.50%	Medium
308	Range Sum Query 2D - Mutable $	20.30%	Hard
309	Best Time to Buy and Sell Stock with Cooldown	32.60%	Medium
310	Minimum Height Trees	20.20%	Medium
311	Sparse Matrix Multiplication $	40.00%	Medium
312	Burst Balloons	24.50%	Medium
313	Super Ugly Number	31.20%	Medium
314	Binary Tree Vertical Order Traversal $	30.10%	Medium
315	Count of Smaller Numbers After Self	28.20%	Hard
316	Remove Duplicate Letters	23.00%	Medium
317	Shortest Distance from All Buildings $	29.10%	Hard
318	Maximum Product of Word Lengths	38.70%	Medium
319	Bulb Switcher	39.20%	Medium
320	Generalized Abbreviation $	40.40%	Medium
321	Create Maximum Number	19.10%	Hard
322	Coin Change	24.90%	Medium
323	Number of Connected Components in an Undirected Graph $	43.30%	Medium
324	Wiggle Sort II	20.10%	Medium
325	Maximum Size Subarray Sum Equals k $	39.60%	Easy
326	Power of Three	35.30%	Easy
327	Count of Range Sum	24.30%	Hard
328	Odd Even Linked List	37.80%	Easy
329	Longest Increasing Path in a Matrix	29.50%	Medium
330	Patching Array	28.80%	Medium
331	Verify Preorder Serialization of a Binary Tree	31.50%	Medium
332	Reconstruct Itinerary	23.40%	Medium
333	Largest BST Subtree $	26.50%	Medium
334	Increasing Triplet Subsequence	33.20%	Medium
335	Self Crossing	18.00%	Medium
336	Palindrome Pairs	18.70%	Hard
337	House Robber III	37.00%	Medium
338	Counting Bits	55.40%	Medium
339	Nested List Weight Sum $	54.60%	Easy
340	Longest Substring with At Most K Distinct Characters $	36.30%	Hard
341	Flatten Nested List Iterator $	18.70%	Medium
342	Power of Four	34.10%	Easy
343	Integer Break	43.60%	Medium
344	Reverse String	58.90%	Easy
345	Reverse Vowels of a String	35.30%	Easy
346	Moving Average from Data Stream $	69.20%	Easy
347	Top K Frequent Elements	44.50%	Medium
348	Design Tic-Tac-Toe $	45.60%	Medium
349	Intersection of Two Arrays	47.80%	Easy
350	Intersection of Two Arrays II	41.50%	Easy
351	Android Unlock Patterns $	32.00%	Medium
352	Data Stream as Disjoint Intervals	34.40%	Hard
353	Design Snake Game $	19.80%	Medium
354	Russian Doll Envelopes	27.10%	Hard
355	Design Twitter	22.20%	Medium
356	Line Reflection $	28.70%	Medium
357	Count Numbers with Unique Digits	42.50%	Medium
358	Rearrange String k Distance Apart $	26.90%	Hard
359	Logger Rate Limiter $	56.00%	Easy
360	Sort Transformed Array $	40.80%	Medium
361	Bomb Enemy $	32.60%	Medium
362	Design Hit Counter $	48.30%	Medium
363	Max Sum of Rectangle No Larger Than K	27.00%	Hard
364	Nested List Weight Sum II $	47.20%	Medium
365	Water and Jug Problem	20.10%	Medium
366	Find Leaves of Binary Tree $	53.60%	Medium
367	Valid Perfect Square	36.60%	Medium
368	Largest Divisible Subset	32.00%	Medium
369	Plus One Linked List $	50.10%	Medium
370	Range Addition $	49.90%	Medium
371	Sum of Two Integers	54.00%	Easy
372	Super Pow	30.10%	Medium
373	Find K Pairs with Smallest Sums	25.50%	Medium
374	Guess Number Higher or Lower	31.70%	Easy
375	Guess Number Higher or Lower II	28.30%	Medium
376	Wiggle Subsequence	35.80%	Medium
377	Combination Sum IV	37.50%	Medium
378	Kth Smallest Element in a Sorted Matrix	40.20%	Medium
379	Design Phone Directory $	25.80%	Medium
380	Insert Delete GetRandom O(1)	33.80%	Medium
381	Insert Delete GetRandom O(1) - Duplicates allowed	30.90%	Hard
382	Linked List Random Node	48.60%	Medium
383	Ransom Note	44.60%	Easy
384	Shuffle an Array	45.50%	Medium
385	Mini Parser	26.90%	Medium
386	Lexicographical Numbers	31.00%	Medium
387	First Unique Character in a String	43.10%	Easy
388	Longest Absolute File Path	28.30%	Medium
389	Find the Difference	49.90%	Easy
390	Elimination Game	12.50%	Medium
391	Perfect Rectangle	13.30%	Hard
392	Is Subsequence	44.10%	Medium
393	UTF-8 Validation	33.00%	Medium
394	Decode String	38.60%	Medium
395	Longest Substring with At Least K Repeating Characters	32.50%	Medium
396	Rotate Function	28.40%	Easy
397	Integer Replacement	25.90%	Easy
398	Random Pick Index	30.40%	Medium
399	Evaluate Division	34.60%	Medium
400	Nth Digit	30.70%	Easy
401	Binary Watch	43.00%	Easy
402	Remove K Digits	25.90%	Medium
403	Frog Jump	31.70%	Hard
404	Sum of Left Leaves	46.20%	Easy
405	Convert a Number to Hexadecimal	41.80%	Easy
406	Queue Reconstruction by Height	54.10%	Medium
407	Trapping Rain Water II	33.10%	Hard
408	Valid Word Abbreviation $	26.20%	Easy
409	Longest Palindrome	44.90%	Easy
410	Split Array Largest Sum	25.00%	Hard
411	Minimum Unique Word Abbreviation $	25.60%	Hard
412	Fizz Buzz	57.50%	Easy
413	Arithmetic Slices	53.50%	Medium
414	Third Maximum Number	26.50%	Easy
415	Add Strings	41.50%	Easy
416	Partition Equal Subset Sum	36.80%	Medium
417	Pacific Atlantic Water Flow	31.10%	Medium
418	Sentence Screen Fitting $	25.10%	Medium
419	Battleships in a Board	59.30%	Medium
420	Strong Password Checker	22.10%	Hard
421	Maximum XOR of Two Numbers in an Array	36.40%	Medium
422	Valid Word Square $	36.40%	Easy
423	Reconstruct Original Digits from English	40.80%	Medium
424	Longest Repeating Character Replacement	38.10%	Medium
425	Word Squares	40.10%	Hard
432	All O`one Data Structure	28.30%	Hard
433	Minimum Genetic Mutation	33.50%	Medium
434	Number of Segments in a String	38.40%	Easy
435	Non-overlapping Intervals	39.80%	Medium
436	Find Right Interval	42.30%	Medium
437	Path Sum III	38.60%	Easy
438	Find All Anagrams in a String	33.50%	Easy
439	Ternary Expression Parser $	49.40%	Medium
440	K-th Smallest in Lexicographical Order	21.50%	Hard
441	Arranging Coins	36.20%	Easy
442	Find All Duplicates in an Array	46.40%	Medium
443	String Compression	35.80%	Easy
444	Sequence Reconstruction $	20.50%	Medium
445	Add Two Numbers II	45.40%	Medium
446	Arithmetic Slices II - Subsequence	22.30%	Hard
447	Number of Boomerangs	42.20%	Easy
448	Find All Numbers Disappeared in an Array	58.30%	Easy
449	Serialize and Deserialize BST	41.20%	Medium
450	Delete Node in a BST	34.50%	Medium
451	Sort Characters By Frequency	50.90%	Medium
452	Minimum Number of Arrows to Burst Balloons	42.10%	Medium
453	Minimum Moves to Equal Array Elements	46.30%	Easy
454	4Sum II	42.80%	Medium
455	Assign Cookies	48.10%	Easy
456	132 Pattern	28.00%	Medium
457	Circular Array Loop	20.60%	Medium
458	Poor Pigs	40.70%	Easy
459	Repeated Substring Pattern	39.70%	Easy
460	LFU Cache	18.30%	Hard
461	Hamming Distance	73.20%	Easy
462	Minimum Moves to Equal Array Elements II	50.90%	Medium
463	Island Perimeter	56.70%	Easy
464	Can I Win	22.20%	Medium
465	Optimal Account Balancing $	29.20%	Hard
466	Count The Repetitions	24.20%	Hard
467	Unique Substrings in Wraparound String	29.90%	Medium
468	Validate IP Address	22.10%	Medium
469	Convex Polygon $	27.20%	Medium
471	Encode String with Shortest Length $	43.50%	Hard
472	Concatenated Words	29.20%	Hard
473	Matchsticks to Square	31.80%	Medium
474	Ones and Zeroes	34.90%	Medium
475	Heaters	30.20%	Easy
476	Number Complement	61.20%	Easy
477	Total Hamming Distance	44.10%	Medium
479	Largest Palindrome Product	23.90%	Easy
480	Sliding Window Median	31.00%	Hard
481	Magical String	46.20%	Medium
482	License Key Formatting	41.20%	Medium
483	Smallest Good Base	30.60%	Hard
484	Find Permutation $	50.50%	Medium
485	Max Consecutive Ones	55.30%	Easy
486	Predict the Winner	43.60%	Medium
487	Max Consecutive Ones II $	42.70%	Medium
488	Zuma Game	38.00%	Hard
490	The Maze	42.80%	Medium
491	Increasing Subsequences	39.30%	Medium
492	Construct the Rectangle	49.70%	Easy
493	Reverse Pairs	17.10%	Hard
494	Target Sum	44.40%	Medium
495	Teemo Attacking	51.90%	Medium
496	Next Greater Element I	58.80%	Easy
498	Diagonal Traverse	46.20%	Medium
499	The Maze III	32.00%	Hard
500	Keyboard Row	60.20%	Easy
501	Find Mode in Binary Search Tree	39.40%	Easy
502	IPO	32.40%	Hard
503	Next Greater Element II	46.20%	Medium
504	Base 7	46.40%	Easy
505	The Maze II	34.80%	Medium
506	Relative Ranks	48.50%	Easy
507	Perfect Number	32.70%	Easy
508	Most Frequent Subtree Sum	52.00%	Medium
513	Find Bottom Left Tree Value	55.60%	Medium
514	Freedom Trail	27.20%	Hard
515	Find Largest Value in Each Tree Row	52.70%	Medium
516	Longest Palindromic Subsequence	42.00%	Medium
517	Super Washing Machines	34.60%	Hard
518	Coin Change 2	33.20%	Medium
520	Detect Capital	54.20%	Easy
521	Longest Uncommon Subsequence I	50.70%	Easy
522	Longest Uncommon Subsequence II	28.10%	Medium
523	Continuous Subarray Sum	21.30	Medium
524	Longest Word in Dictionary through Deleting	40.20%	Medium
525	Contiguous Array	34.40%	Medium
526	Beautiful Arrangement	53.50%	Medium
527	Word Abbreviation $	33.90%	Hard
529	Minesweeper	52.00%	Medium
530	Minimum Absolute Difference in BST	48.00%	Easy
531	Lonely Pixel I $	50.20%	Medium
532	K-diff Pairs in an Array	27.20%	Easy
533	Lonely Pixel II $	38.90%	Medium
534	Design TinyURL	N/A	Medium
535	Encode and Decode TinyURL	76.10%	Medium
536	Construct Binary Tree from String $	36.30%	Medium
537	Complex Number Multiplication	65.90%	Medium
538	Convert BST to Greater Tree	52.70%	Medium
539	Minimum Time Difference	44.70%	Medium
540	Single Element in a Sorted Array	55.90%	Medium
541	Reverse String II	44.40%	Easy
542	01 Matrix	32.50%	Medium
543	Diameter of Binary Tree	42.70%	Easy
544	Output Contest Matches $	73.20%	Medium
545	Boundary of Binary Tree $	29.10%	Medium
546	Remove Boxes	29.60%	Hard
547	Friend Circles	49.00%	Medium
548	Split Array with Equal Sum $	30.80%	Medium
549	Binary Tree Longest Consecutive Sequence II $	38.10%	Medium
551	Student Attendance Record I	43.90%	Easy
552	Student Attendance Record II	28.50%	Hard
553	Optimal Division	55.20%	Medium
554	Brick Wall	42.70%	Medium
555	Split Concatenated Strings $	30.00%	Medium
556	Next Greater Element III	27.70%	Medium
557	Reverse Words in a String III	61.20%	Easy
560	Subarray Sum Equals K	41.80%	Medium
561	Array Partition I	69.80%	Easy
562	Longest Line of Consecutive One in Matrix $	38.80%	Medium
563	Binary Tree Tilt	47.00%	Easy
564	Find the Closest Palindrome	16.60%	Hard
565	Array Nesting	50.00%	Medium
566	Reshape the Matrix	59.80%	Easy
567	Permutation in String	36.30%	Medium
568	Maximum Vacation Days $	39.90%	Hard
572	Subtree of Another Tree	41.00%	Easy
573	Squirrel Simulation	51.00%	Medium
575	Distribute Candies	59.50%	Easy
576	Out of Boundary Paths	33.10%	Medium
581	Shortest Unsorted Continuous Subarray	30.10%	Easy
582	Kill Process $	47.70%	Medium
583	Delete Operation for Two Strings	44.00%	Medium
587	Erect the Fence	29.90%	Hard
588	Design In-Memory File System $	32.40%	Hard
591	Tag Validator	26.40%	Hard
592	Fraction Addition and Subtraction	47.00%	Medium
593	Valid Square	39.20%	Medium
594	Longest Harmonious Subsequence	40.00%	Easy
598	Range Addition II	48.30%	Easy
599	Minimum Index Sum of Two Lists	48.00%	Easy
600	Non-negative Integers without Consecutive Ones	27.40%	Hard
604	Design Compressed String Iterator $	31.60%	Easy
605	Can Place Flowers	30.00%	Easy
606	Construct String from Binary Tree	51.80%	Easy
609	Find Duplicate File in System	52.50%	Medium
611	Valid Triangle Number	38.90%	Medium
616	Add Bold Tag in String $	37.30%	Medium
617	Merge Two Binary Trees	69.60%	Easy
621	Task Scheduler	41.40%	Medium
623	Add One Row to Tree	48.70%	Medium
624	Maximum Distance in Arrays $	32.70%	Easy
625	Minimum Factorization	29.50%	Medium
628	Maximum Product of Three Numbers	45.40%	Easy
629	K Inverse Pairs Array	23.90%	Hard
630	Course Schedule III	20.50%	Medium
631	Design Excel Sum Formula $	25.60%	Hard
632	Smallest Range	42.80%	Hard
633	Sum of Square Numbers	31.60%	Easy
634	Find the Derangement of An Array $	32.70%	Medium
635	Design Log Storage System $	47.70%	Medium
636	Exclusive Time of Functions	40.30%	Medium
637	Average of Levels in Binary Tree	55.60%	Easy
638	Shopping Offers	41.50%	Medium
639	Decode Ways II	22.80%	Hard
640	Solve the Equation	39.00%	Medium
642	Design Search Autocomplete System $	29.40%	Hard
643	Maximum Average Subarray I	38.40%	Easy
644	Maximum Average Subarray II $	20.30%	Hard
645	Set Mismatch	40.40%	Easy
646	Maximum Length of Pair Chain	47.40%	Medium
647	Palindromic Substrings	55.70%	Medium
648	Replace Words	48.40%	Medium
649	Dota2 Senate	35.60%	Medium
650	2 Keys Keyboard	42.70%	Medium
651	4 Keys Keyboard $	46.70%	Medium
652	Find Duplicate Subtrees	33.20%	Medium
653	Two Sum IV - Input is a BST	50.60%	Easy
654	Maximum Binary Tree	70.80%	Medium
655	Print Binary Tree	50.80%	Medium
656	Coin Path $	24.60%	Hard
657	Judge Route Circle	69.30%	Easy
658	Find K Closest Elements	36.30%	Medium
659	Split Array into Consecutive Subsequences	39.40%	Medium
660	Remove 9 $	46.10%	Hard
661	Image Smoother	46.60%	Easy
662	Maximum Width of Binary Tree	37.00%	Medium
663	Equal Tree Partition $	36.70%	Medium
664	Strange Printer	31.10%	Hard
665	Non-decreasing Array	21.20%	Easy
666	Path Sum IV $	48.90%	Medium
667	Beautiful Arrangement II	51.50%	Medium
668	Kth Smallest Number in Multiplication Table	36.30%	Hard
669	Trim a Binary Search Tree	58.70%	Easy
670	Maximum Swap	38.40%	Medium
671	Second Minimum Node In a Binary Tree	42.30%	Easy
672	Bulb Switcher II	47.60%	Medium
673	Number of Longest Increasing Subsequence	30.80%	Medium
674	Longest Continuous Increasing Subsequence	43.20%	Easy
675	Cut Off Trees for Golf Event	27.20%	Hard
676	Implement Magic Dictionary	50.70%	Medium
677	Map Sum Pairs	53.80%	Medium
678	Valid Parenthesis String	28.30%	Medium
679	24 Game	38.30%	Hard
680	Valid Palindrome II	31.10%	Easy
681	Next Closest Time $	43.00%	Medium
682	Baseball Game	58.60%	Easy
683	K Empty Slots	37.00%	Hard
684	Redundant Connection	37.40%	Medium
685	Redundant Connection II	28.40%	Hard
686	Repeated String Match	31.70%	Easy
687	Longest Univalue Path	32.90%	Easy
688	Knight Probability in Chessboard	38.90%	Medium
689	Maximum Sum of 3 Non-Overlapping Subarrays	41.70%	Hard
690	Employee Importance	53.60%	Easy
691	Stickers to Spell Word	32.30%	Hard
692	Top K Frequent Words	41.70%	Medium
693	Binary Number with Alternating Bits	54.20%	Easy
694	Number of Distinct Islands $	43.90%	Medium
695	Max Area of Island	53.30%	Easy
696	Count Binary Substrings	51.90%	Easy
697	Degree of an Array	47.90%	Easy
698	Partition to K Equal Sum Subsets	35.60%	Medium
699	Falling Squares	36.80%	Hard
711	Number of Distinct Islands II $	39.40%	Hard
712	Minimum ASCII Delete Sum for Two Strings	50.90%	Medium
713	Subarray Product Less Than K	32.90%	Medium
714	Best Time to Buy and Sell Stock with Transaction Fee	41.60%	Medium
715	Range Module	31.00%	Hard
716	Max Stack $	35.50%	Hard
717	1-bit and 2-bit Characters	50.90%	Easy
718	Maximum Length of Repeated Subarray	39.90%	Medium
719	Find K-th Smallest Pair Distance	26.10%	Hard
720	Longest Word in Dictionary	40.60%	Easy
721	Accounts Merge	29.60%	Medium
722	Remove Comments	26.30%	Medium
723	Candy Crush $	56.10%	Medium
724	Find Pivot Index	41.00%	Easy
725	Split Linked List in Parts	50.00%	Medium
726	Number of Atoms	45.00%	Hard
727	Minimum Window Subsequence	30.10%	Hard
728	Self Dividing Numbers	68.50%	Easy
729	My Calendar I	40.10%	Medium
730	Count Different Palindromic Subsequences	32.40%	Hard
731	My Calendar II	35.00%	Medium
732	My Calendar III	51.30%	Hard
733	Flood Fill	49.30%	Easy
734	Sentence Similarity $	38.60%	Easy
735	Asteroid Collision	37.60%	Medium
736	Parse Lisp Expression	42.00%	Hard
737	Sentence Similarity II $	41.20%	Medium
738	Monotone Increasing Digits	41.80%	Medium
739	Daily Temperatures	53.50%	Medium
740	Delete and Earn	42.60%	Medium
741	Cherry Pickup	22.50%	Hard
742	Closest Leaf in a Binary Tree $	33.20%	Medium
743	Network Delay Time	34.30%	Medium
744	Find Smallest Letter Greater Than Target	45.30%	Easy
745	Prefix and Suffix Search	24.50%	Hard
746	Min Cost Climbing Stairs	43.60%	Easy
747	Largest Number At Least Twice of Others	42.60%	Easy
748	Shortest Completing Word	53.50%	Medium
749	Contain Virus	39.60%	Hard
750	Number Of Corner Rectangles $	51.00%	Medium
751	IP to CIDR $	54.80%	Easy
752	Open the Lock	38.20%	Medium
753	Cracking the Safe	39.70%	Hard
754	Reach a Number	26.10%	Medium
755	Pour Water $	34.00%	Medium
756	Pyramid Transition Matrix	45.50%	Medium
757	Set Intersection Size At Least Two	34.60%	Hard
758	Bold Words in String $	37.90%	Easy
759	Employee Free Time $	51.90%	Hard
760	Find Anagram Mappings $	75.60%	Easy
761	Special Binary String	41.00%	Hard
762	Prime Number of Set Bits in Binary Representation	55.00%	Easy
763	Partition Labels	64.10%	Medium
764	Largest Plus Sign	39.20%	Medium
765	Couples Holding Hands	48.50%	Hard
766	Toeplitz Matrix	57.90%	Easy
767	Reorganize String	36.50%	Medium
768	Max Chunks To Make Sorted II	43.20%	Hard
769	Max Chunks To Make Sorted	48.00%	Medium
770	Basic Calculator IV	42.10%	Hard
771	Jewels and Stones	81.90%	Easy
772	Basic Calculator III $	40.10%	Hard
773	Sliding Puzzle	46.50%	Hard
774	Minimize Max Distance to Gas Station $	32.80%	Hard
775	Global and Local Inversions	33.60%	Medium
776	Split BST $	49.90%	Medium
777	Swap Adjacent in LR String	28.90%	Medium
778	Swim in Rising Water	44.60%	Hard
779	K-th Symbol in Grammar	37.30%	Medium
780	Reaching Points	23.90%	Hard
781	Rabbits in Forest	49.80%	Medium
782	Transform to Chessboard	37.50%	Hard
783	[Minimum Distance