LeetCode

LeetCode Algorithm

#	Title	Solution	Difficulty
1929	Concatenation of Array	js	Easy
1920	Concatenation of Array	js	Easy
1464	Maximum Product of Two Elements in An Array	java java_dream	Easy
1207	Unique Number of Occurrences	java_dream	Easy
1179	Reformat Department Table	Mysql	Easy
1170	Compare Strings by Frequency of the Smallest Character	java_dream	Easy
1137	N-th Tribonacci Number	js	Easy
1071	Greatest Common Divisor of Strings		Easy
1030	Matrix Cells in Distance Order		Easy
1029	Two City Scheduling		Easy
1028	Recover a Tree From Preorder Traversal		Hard
1024	Video Stitching		Medium
993	Cousins in Binary Tree	java	Easy
991	Broken Calculator		Medium
990	Satisfiability of Equality Equations		Medium
989	Add to Array-Form of Integer	java_dream	Easy
988	Smallest String Starting From Leaf		Medium
987	Vertical Order Traversal of a Binary Tree		Medium
986	Interval List Intersections		Medium
985	Sum of Even Numbers After Queries		Easy
984	String Without AAA or BBB	java_dream	Easy
983	Minimum Cost For Tickets		Medium
982	Triples with Bitwise AND Equal To Zero		Hard
981	Time Based Key-Value Store		Medium
980	Unique Paths III		Hard
979	Distribute Coins in Binary Tree		Medium
978	Longest Turbulent Subarray		Medium
977	Squares of a Sorted Array	java_dream	Easy
976	Largest Perimeter Triangle		Easy
971	Flip Binary Tree To Match Preorder Traversal		Medium
969	Pancake Sorting		Medium
965	Univalued Binary Tree	Java	Easy
961	N-Repeated element in size 2N Array		Easy
958	Check Completeness of a Binary Tree		Medium
951	Flip Equivalent Binary Trees		Medium
950	Reveal Cards In Increasing Order		Medium
941	Valid Mountain Array		Easy
933	Number of Recent Calls js		Easy
931	Minimum Falling Path Sum		Medium
929	Unique Email Addresses		Easy
922	Sort Array By Parity II		Easy
914	X of a Kind in a Deck of Cards		Easy
905	Sort Array By Parity		Easy
876	Middle of the Linked List	js	Easy
859	Buddy Strings		Easy
858	Mirror Reflection		Medium
852	Peak Index in a Mountain Array		Easy
849	Maximize Distance to Closest Person		Easy
844	Backspace String Compare		Easy
837	Most Common Word		Easy
830	Positions of Large Groups		Easy
804	Unique Morse Code Words		Easy
771	Jewels and Stones		Easy
747	Largest Number At Least Twice of Others		Easy
746	Min Cost Climbing Stairs	Java_dream	Easy
721	Accounts Merge		Medium
717	1-bit and 2-bit Characters		Easy
714	Best Time to Buy and Sell Stock with Transaction Fee		Medium
712	Minimum ASCII Sum for Two Strings		Medium
709	To Lower Case	js
704	Binary Search	Java
701	Insert Into A Binary Search Tree	Java
700	Search In A Binary Search Tree	Java
695	Max Area of Island		Medium
687	Longest Univalue Path		Easy
684	Redundant Connection		Medium
674	Longest Continuous Increasing Subsequence		Easy
671	Second Minimum Node In a Binary Tree		Easy
665	Non-decreasing Array	Java_dream	Easy
662	Maximum Width of Binary Tree		Medium
661	Image Smoother		Easy
655	Print Binary Tree		Medium
652	Find Duplicate Subtrees		Medium
647	Palindromic Substrings		Medium
643	Maximum Average Subarray I	Java_dream	Easy
628	Maximum Product of Three Numbers		Easy
627	Swap Salary	Mysql
626	Exchange Seats	Mysql
623	Add One Row to Tree		Medium
620	Not Boring Movies	Mysql	Easy
617	Merge Two Binary Trees	Java	Easy
595	Big Countries	Mysql	Easy
581	Shortest Unsorted Continuous Subarray	Java_dream	Easy
575	Distrubute Candies	java	Easy
572	Subtree of Another Tree		Easy
563	Binary Tree Tilt	java	Easy
547	Friend Circles		Medium
543	Diameter of Binary Tree		Easy
538	Convert BST to Greater Tree		Easy
532	K-diff Pairs in an Array		Easy
520	Detect Capital		Easy
518	Coin Change 2		Medium
509	Fibonacci Number	java	Easy
501	Find Mode In Binary Search Tree	java	Easy
477	Total Hamming Distance		Medium
463	Island Perimeter		Easy
455	Assign Cookies	js	Medium
450	NodeInABST		Medium
449	Serialize and Deserialize BST		Medium
438	Find all Anagrams in a string		Medium
437	Path Sum III		Medium
418	SentenceScreenFitting ♥		Easy
417	Pacific Atlantic Water Flow	js	Medium
416	Partition Equal Subset Sum		Medium
415	Add Strings		Easy
414	Third Maximum Number		Easy
413	Arithmetic Slices		Medium
412	Fizz Buzz		Easy
410	Split Array Largest Sum		Hard
409	Longest Palindrome		Easy
406	Queue Reconstruction by Height		Medium
405	Convert a Number to Hexadecimal		Easy
404	Sum of Left Leaves		Easy
403	Frog Jump		Hard
402	Remove K Digits		Medium
401	Binary Watch		Easy
400	Nth Digit		Medium
399	Evaluate Division		Medium
398	Random Pick Index		Medium
397	Integer Replacement		Medium
396	Rotate Function		Easy
395	Longest Substring with At Least K Repeating Characters		Medium
394	Decode String		Medium
393	UTF-8 Validation		Medium
392	Is Subsequence		Medium
391	Perfect Rectangle		Hard
390	Elimination Game		Medium
389	Find the Difference		Easy
388	Longest Absolute File Path		Medium
387	First Unique Character in a String	js	Easy
386	Lexicographical Numbers		Medium
385	Mini Parser		Medium
384	Shuffle an Array		Medium
383	Ransom Note		Easy
382	Linked List Random Node		Medium
381	Insert GetRandom O(1) - Duplicates allowed		Hard
380	Insert GetRandom O(1)		Hard
377	Combination Sum IV		Medium
376	Wiggle Subsequence		Medium
374	Guess Number Higher Or Lower	js	Easy
371	Sum of Two Integers		Easy
367	Valid Perfect Square		Easy
357	Count Numbers with Unique Digits		Medium
350	Intersection of Two Arrays II	js	Easy
349	Intersection of Two Arrays	js	Easy
347	Top K Frequent Elements	js	Medium
345	Reverse Vowels of a String		Easy
344	Reverse String java, js		Easy
343	Integer Break		Medium
342	Power of Four		Easy
341	Flatten Nested List Iterator		Medium
338	Counting Bits		Medium
337	House Robber III		Medium
336	Palindrome Pairs		Hard
334	Increasing Triplet Subsequence		Medium
332	Reconstruct Itinerary		Medium
331	Verify Preorder Serialization of a Binary Tree		Medium
330	Patching Array		Medium
329	Longest Increasing Path in a Matrix		Medium
328	Odd Even Linked List		Easy
327	Count of Range Sum		Hard
326	Power of Three		Easy
324	Wiggle Sort II		Medium
322	Coin Change		Medium
321	Create Maximum Number		Hard
319	Bulb Switcher		Medium
318	Maximum Product of Word Lengths		Medium
316	Remove Duplicate Letters		Hard
315	Count of Smaller Numbers After Self		Hard
313	Super Ugly Number		Medium
312	Burst Balloons		Hard
310	Minimum Height Trees		Medium
309	Best Time to Buy and Sell Stock with Cooldown		Medium
307	Range Sum Query - Mutable		Medium
306	Additive Number		Medium
304	Range Sum Query 2D - Immutable		Medium
303	Range Sum Query - Immutable		Easy
301	Remove Invalid Parentheses		Hard
300	Longest Increasing Subsequence		Medium
299	Bulls and Cows		Easy
297	Serialize and Deserialize Binary Tree		Medium
295	Find Median from Data Stream		Hard
292	Nim Game		Easy
290	Word Pattern		Easy
289	Game of Life		Medium
287	Find the Duplicate Number		Hard
285	Inorder Successor in BST ♥		Medium
284	Peeking Iterator		Medium
283	Move Zeroes	js	Easy
282	Expression Add Operators		Hard
279	Perfect Squares		Medium
278	First Bad Version		Easy
275	H-Index II		Medium
274	H-Index		Medium
273	Integer to English Words		Medium
268	Missing Number		Medium
264	Ugly Number II		Medium
263	Ugly Number		Easy
262	Trips and Users	Mysql	Hard
260	Single Number III		Medium
258	Add Digits		Easy
257	Binary Tree Paths	Java	Easy
242	Valid Anagram	js	Easy
241	Different Ways to Add Parentheses		Medium
240	Search a 2D Matrix II		Medium
239	Sliding Window Maximum		Hard
238	Product of Array Except Self		Medium
237	Node in a Linked List	js,java	Easy
236	Lowest Common Ancestor of a Binary Tree		Medium
235	Lowest Common Ancestor of a Binary Search Tree	java	Easy
234	Palindrome Linked List	java	Easy
233	Number of Digit One		Medium
232	Implement Queue using Stacks		Easy
231	Power of Two	java	Easy
230	Kth Smallest Element in a BST		Medium
229	Majority Element II		Medium
228	Summary Ranges		Easy
227	Basic Calculator II		Medium
226	Invert Binary Tree	java, js	Easy
225	Implement Stack using Queues		Medium
224	Basic Calculator		Medium
223	Rectangle Area		Easy
222	Count Complete Tree Nodes		Medium
221	Maximal Square		Medium
220	Contains Duplicate III		Medium
219	Contains Duplicate II		Easy
218	The Skyline Problem		Hard
217	Contains Duplicate		Easy
216	Combination Sum III		Medium
215	Kth Largest Element in an Array	js	Medium
214	Shortest Palindrome		Hard
213	House Robber II		Medium
212	Word Search II		Hard
211	Add and Search Word - Data structure design		Medium
210	Course Schedule II		Medium
209	Minimum Size Subarray Sum		Medium
208	Implement Trie (Prefix Tree)		Medium
207	Course Schedule		Medium
206	Reverse Linked List	java, js	Easy
205	Isomorphic Strings	java	Easy
204	Count Primes		Easy
203	Remove Linked List Elements	js,java	Easy
202	Happy Number		Easy
201	Bitwise AND of Numbers Range		Medium
200	Number of Islands		Medium
199	Binary Tree Right Side View		Medium
198	House Robber	js	Easy
197	Rising Temperature	Mysql	Easy
196	Delete Duplicate Emails	Mysql	Easy
191	Number of 1 Bits	java, js	Easy
190	Reverse Bits		Easy
189	Rotate Array		Easy
188	Best Time to Buy and Sell Stock IV		Hard
187	Repeated DNA Sequences		Medium
186	Reverse Words in a String II ♥		Medium
184	Department Highest Salary/	Mysql	Medium
183	Customers Who Never Order	Mysql	Easy
182	Duplicate Email	Mysql	Easy
181	Employees Earning More Than Their Managers	Mysql	Easy
179	Largest Number		Medium
178	Ranking Scores	Mysql	Easy
177	Nth Highest Salary	Mysql	Easy
176	Second Highest Salary	Mysql	Easy
175	Combine Two Tables	Mysql	Easy
174	Dungeon Game		Hard
173	Binary Search Tree Iterator		Medium
172	Factorial Trailing Zeroes		Easy
171	Excel Sheet Column Number	Java	Easy
170	Two Sum III - Data structure design ♥		Easy
169	Majority Element	java	Easy
168	Excel Sheet Column Title	Java, js	Easy
167	Two Sum II - Input array is sorted ♥		Medium
166	Fraction to Recurring Decimal		Medium
165	Compare Version Numbers		Easy
164	Maximum Gap		Hard
163	Missing Ranges ♥		Medium
162	Find Peak Element		Medium
161	One Edit Distance♥		Medium
160	Intersection of Two Linked Lists	java, js	Easy
159	Longest Substring with At Most Two Distinct Characters ♥		Hard
158	Read N Characters Given Read4 II - Call multiple times ♥		Hard
157	Read N Characters Given Read4 ♥		Easy
156	Binary Tree Upside Down ♥		Medium
155	Min Stack		Easy
154	Find Minimum in Rotated Sorted Array II		Hard
153	Find Minimum in Rotated Sorted Array		Medium
152	Maximum Product Subarray		Medium
151	Reverse Words in a String		Medium
150	Evaluate Reverse Polish Notation		Medium
149	Max Points on a Line		Hard
148	Sort List		Medium
147	Insertion Sort List		Medium
146	LRU Cache		Hard
145	Binary Tree Postorder Traversal	js	Hard
144	Binary Tree Preorder Traversal	js	Medium
143	Reorder List		Medium
142	Linked List Cycle II	js	Medium
141	Linked List Cycle	java, js	Medium
140	Word Break II		Hard
139	Word Break		Medium
138	Copy List with Random Pointer		Hard
137	Single Number II		Medium
136	Single Number	java	Medium
135	Candy		Hard
134	Gas Station		Medium
133	Clone Graph	js	Medium
132	Palindrome Partitioning II		Hard
131	Palindrome Partitioning		Medium
130	Surrounded Regions		Medium
129	Sum Root to Leaf Numbers		Medium
128	Longest Consecutive Sequence		Hard
127	Word Ladder		Medium
126	Word Ladder II		Hard
125	Valid Palindrome		Easy
124	Binary Tree Maximum Path Sum		Hard
123	Best Time to Buy and Sell Stock III		Hard
122	Best Time to Buy and Sell Stock II	js	Medium
121	Best Time to Buy and Sell Stock	java, js	Medium
120	Triangle		Medium
119	Pascal's Triangle II		Easy
118	Pascal's Triangle		Easy
117	Populating Next Right Pointers in Each Node II		Hard
116	Populating Next Right Pointers in Each Node		Medium
115	Distinct Subsequences		Hard
114	Flatten Binary Tree to Linked List		Medium
113	Path Sum II		Medium
112	Path Sum	js	Easy
111	Minimum Depth of Binary Tree	js	Easy
110	Balanced Binary Tree	java, js	Easy
109	Convert Sorted List to Binary Search Tree		Medium
108	Convert Sorted Array to Binary Search Tree	Java, js	Medium
107	Binary Tree Level Order Traversal II		Easy
106	Construct Binary Tree from Inorder and Postorder Traversal		Medium
105	Construct Binary Tree from Preorder and Inorder Traversal		Medium
104	Maximum Depth of Binary Tree	js java	Easy
103	Binary Tree Zigzag Level Order Traversal		Medium
102	Binary Tree Level Order Traversal	js	Easy
101	Symmetric Tree	java, js	Easy
100	Same Tree	java, js	Easy
99	Recover Binary Search Tree		Hard
98	Validate Binary Search Tree		Medium
97	Interleaving String		Hard
96	Unique Binary Search Trees		Medium
95	Unique Binary Search Trees II		Medium
94	Binary Tree Inorder Traversal	js	Medium
93	Restore IP Addresses		Medium
92	Reverse Linked List II		Medium
91	Decode Ways		Medium
90	Subsets II		Medium
89	Gray Code		Medium
88	Merge Sorted Array	java, js	Easy
87	Scramble String		Hard
86	Partition List		Medium
85	Maximal Rectangle		Hard
84	Largest Rectangle in Histogram		Hard
83	Remove Duplicates from Sorted List	js	Easy
82	Remove Duplicates from Sorted List II		Medium
81	Search in Rotated Sorted Array II		Medium
80	Remove Duplicates from Sorted Array II		Medium
79	Word Search		Medium
78	Subsets	js	Medium
77	Combinations		Medium
76	Minimum Window Substring		Hard
75	Sort Colors		Medium
74	Search a 2D Matrix		Medium
73	Set Matrix Zeroes		Medium
72	Edit Distance		Hard
71	Simplify Path		Medium
70	Climbing Stairs	js,java	Easy
69	Sqrt(x)		Medium
68	Text Justification		Hard
67	Add Binary	java, js	Easy
66	Plus One	js	Easy
65	Valid Number	js	Easy
64	Minimum Path Sum		Medium
63	Unique Paths II		Medium
62	Unique Paths		Medium
61	Rotate List	js	Medium
60	Permutation Sequence		Medium
59	Spiral Matrix II		Medium
58	Length of Last Word		Easy
57	Insert Interval		Hard
56	Merge Intervals		Hard
55	Jump Game		Medium
54	Spiral Matrix		Medium
53	Maximum Subarray	js	Medium
52	N-Queens II		Hard
51	N-Queens		Hard
50	"Pow(x, n)"		Medium
49	Group Anagrams	js	Medium
48	Rotate Image		Medium
47	Permutations II		Hard
46	Permutations	js	Medium
45	Jump Game II		Hard
44	Wildcard Matching		Hard
43	Multiply Strings		Medium
42	Trapping Rain Water		Hard
41	First Missing Positive		Hard
40	Combination Sum II		Medium
39	Combination Sum		Medium
38	Count and Say		Easy
37	Sudoku Solver		Hard
36	Valid Sudoku		Easy
35	Search Insert Position	js	Easy
34	Search for a Range		Medium
33	Search in Rotated Sorted Array		Hard
32	Longest Valid Parentheses		Hard
31	Next Permutation		Medium
30	Substring with Concatenation of All Words		Hard
29	Divide Two Integers		Medium
28	Implement strStr()	js	Easy
27	Remove Element	js python	Easy
26	Remove Duplicates from Sorted Array	java, js	Easy
25	Reverse Nodes in k-Group		Hard
24	Swap Nodes in Pairs	js	Medium
23	Merge k Sorted Lists	js	Hard
22	Generate Parentheses	js	Medium
21	Merge Two Sorted Lists	java, js	Easy
20	Valid Parentheses	js	Easy
19	Remove Nth Node From End of List	js	Easy
18	4Sum	js	Medium
17	Letter Combinations of a Phone Number	js	Medium
16	3Sum Closest		Medium
15	3Sum	js	Medium
14	Longest Common Prefix	js	Easy
13	Roman to Integer	js	Easy
12	Integer to Roman		Medium
11	Container With Most Water	js	Medium
10	Regular Expression Matching		Hard
9	Palindrome Number	js	Easy
8	String to Integer (atoi)		Easy
7	Reverse Integer	js,java	Easy
6	ZigZag Conversion		Easy
5	Longest Palindromic Substring		Medium
4	Median of Two Sorted Arrays		Hard
3	Longest Substring Without Repeating Characters	js	Medium
2	Add Two Numbers	js	Medium
1	Two Sum	java, js, python	Easy

面试题

#	Title	Solution	Difficulty
面试题 08.06	汉诺塔问题	js	Easy

剑指 Offer

#	Title	Solution	Difficulty
53 - II	0～n-1中缺失的数字	js	Easy