wenting-song/leetcode

Java solution for Leetcode/LintCode

Leetcode/Lintcode

Solution for Leetcode/Lintcode

Sequence	No.#	Problem	Level	Language	Source
1	1	Two Sum.java	Easy	Java	Leetcode
2	242	Valid Anagram.java	Easy	Java	Leetcode
3	144	Binary Tree Preorder Traversal	Medium	Java	Leetcode
4	94	Binary Tree Inorder Traversal Tree Iteration Template	Medium	Java	Leetcode
5	512	Decode Ways Dynamic Programming	Medium	Java	Lintcode
6	638	Strings Homomorphism.java	Easy	Java	Lintcode
7	626	Rectangle Overlap.java	Easy	Java	Lintcode
8	637	Check Word Abbreviation.java	Easy	Java	Lintcode
9	639	Word Abbreviation.java	Hard	Java	Lintcode
10	642	Sliding Window Average from Data Stream.java	Easy	Java	Lintcode
11	640	Edit Distance II.java	Medium	Java	Lintcode
12	660	Read Characters From File.java	Hard	Java	Lintcode
13	659	Strings Serialization.java	Medium	Java	Lintcode
14	643	System Longest File Path.java	Medium	Java	Lintcode
15	419	Roman to Integer.java	Medium	Java	Lintcode
16	418	Integer to Roman.java	Medium	Java	Lintcode
17	645	Identify Celebrity.java	Medium	Java	Lintcode
18	644	Mirror Numbers.java	Easy	Java	Lintcode
19	72	Edit Distance.java	Medium	Java	Leetcode
20	641	Missing Interval.java	Medium	Java	Lintcode
21	156	Merge Intervals.java	Medium	Java	Lintcode
22	30	Insert Interval.java	Hard	Java	Lintcode
23	646	First Position Unique Character.java	Easy	Java	Lintcode
24	647	Substring Anagrams.java	Medium	Java	lintcode
25	648	Word Abbreviation Set.java	Medium	Java	Lintcode
26	124	Longest Consecutive Sequence.java	Medium	Java	Lintcode
27	526	Load Balancer.java	Medium	Java	Lintcode
28	76	Longest Increasing Subsequence.java	Medium	Java	Lintcode
29	423	Valid Parentheses Good	Easy	Java	Lintcode
30	622	Guess Number Game.java	Easy	Java	Lintcode
31	61	Search for a Range.java	Medium	Java	Lintcode
32	661	Conver BST to Greater Tree Good	Easy	Java	Lintcode
33	448	Inorder Successor Binary Search Tree Good	Medium	Java	Lintcode
34	649	Binary Tree Flipping Good	Medium	Java	Lintcode
32	650	Binary Tree Leaves Order Traversal Good	Medium	Java	Lintcode
33	651	Binary Tree Vertical Order Traversal Good	Medium	Java	Lintcode
34	628	Maximum Subtree.java	Easy	Java	Lintcode
35	270	Closest Binary Search Tree Value Good	Easy	Java	Leetcode
36	74	First Bad Version.java	Medium	Java	Lintcode
37	629	Minimum Spanning Tree.java	Hard	Java	Lintcode
38	477	Surrounded Regions.java	Medium	Java	Lintcode
39	477	Surrounded Regions.py	Medium	Java	Lintcode
40	663	Nearest Exit.java	Medium	Java	Lintcode
41	425	Letter Combinations of Phone Number.java	Medium	Java	Lintcode
42	652	Factorization.java	Medium	Java	Lintcode
43	653	Add Operators.java	Hard	Java	Lintcode
44	634	Word Squares.java	Hard	Java	Lintcode
45	38	Search a 2D Matrix II.java	Medium	Java	Lintcode
46	161	Rotate Image.java	Medium	Java	Lintcode
47	654	Sparse Matrix Multiplication	Medium	Java	Lintcode
48	655	Big Integer Addition.java	Easy	Java	Lintcode
49	656	Big Integer Multiplication.java	Medium	Java	Lintcode
50	408	Add Binary.java	Medium	Java	Lintcode
51	167	Add Two Numbers.java	Easy	Java	Lintcode
52	428	Pow.java	Medium	Java	Lintcode
53	433	Number of Islands.java	Easy	Java	Lintcode
54	107	Word Break.java	Medium	Java	Lintcode
55	3	Longest Substring Without Repeating Chars Sliding Window	Medium	Java	Leetcode
56	4	Median of Two Sorted Arrays	Hard	Java	Leetcode
57	5	Longest Palindromic Substring Dynamic Programming	Medium	Java	Leetcode
58	6	Zig Zag Conversion.java	Medium	Java	Leetcode
59	7	Reverse Integer	Easy	Java	Leetcode
60	688	Knight Probability in Chessboard.java	Medium	Java	Leetcode
61	697	Degree of Array.java	Easy	Java	Leetcode
62	39	Combination Sum.java	Medium	Java	Leetcode
63	40	Combination Sum II.java	Medium	Java	Leetcode
64	46	Permutations.java	Medium	Java	Leetcode
65	47	Permutations II.java	Medium	Java	Leetcode
66	146	LRU Cache.java	Hard	Java	Leetcode
67	15	3Sum.java	Medium	Java	Leetcode
68	74	Search 2D Matrix.java	Medium	Java	Leetcode
69	33	Search in Rotated Sorted Array.java	Medium	Java	Leetcode
70	235	Lowest Common Ancestor Binary Search Tree	Easy	Java	Leetcode
71	236	Lowest Common Ancestor Binary Tree	Medium	Java	Leetcode
72	104	Maximum Depth of Binary Tree.java	Easy	Java	Leetcode
73	257	Binary Tree Paths.java	Easy	Java	Leetcode
74	110	Valid Balanced Binary Tree.java	Easy	Java	Leetcode
75	298	Binary Tree Longest Consecutive Sequence	Medium	Java	Leetcode
76	378	Convert Binary Search Tree to DoublyLinkedList	Medium	Java	Lintcode
77	207	Course Schedule Topological Sort Find Cycle	Medium	Java	Leetcode
78	210	Course Schedule II	Medium	Java	Leetcode
79	70	Binary Tree Level Order Traversal II	Medium	Java	Lintcode
80	178	Graph Valid Tree.java	Medium	Java	Lintcode
81	51	N-Queens.java	Hard	Java	Leetcode
82	52	N-Queens II.java	Hard	Java	Leetcode
83	112	Path Sum	Easy	Java	Leetcode
84	113	Path Sum II Backtracking Very good	Medium	Java	Leetcode
85	528	Flatten Nested List Iterator Very Good Stack	Medium	Java	Lintcode
86	40	Implement Queue by Stacks	Medium	Java	Lintcode
87	450	Reverse Nodes in k-Group.java	Hard	Java	Lintcode
88	105	Copy List with RandomPointer.java	Medium	Java	Lintcode
89	21	Merge Two Sorted Lists.java	Easy	Java	Leetcode
90	148	Sort List.java	Medium	Java	Leetcode
91	23	Merge k Sorted Lists.java	Hard	Java	Leetcode
92	53	Maximum Subarray Very Good Greedy DP	Easy	Java	Leetcode
93	138	Subarray Sum.java	Easy	Java	Lintcode
94	139	Subarray Sum Closest.java	Medium	Java	Lintcode
95	560	Subarray Sum Equals K Prefix Sum Very Good	Medium	Java	Leetcode
96	283	Move Zeroes.java	Easy	Java	Leetcode
97	27	Remove Element.java	Easy	Java	Leetcode
98	26	Remove Duplicates from Sorted Array Good	Easy	Java	Leetcode
99	16	3SumClosest.java	Medium	Java	Leetcode
100	31	Partition Array.java	Medium	Java	Lintcode
101	561	ArrayPartitionI.java	Easy	Java	Leetcode
102	5	Kth Largest Element Quick Select	Medium	Java	Lintcode
103	75	Sort Colors Three pointers Good	Medium	Java	Leetcode
104	143	Sort Colors II.java	Medium	Java	Lintcode
105	129	Rehashing.java	Medium	Java	Lintcode
106	128	Longest Consecutive Sequence.java	Hard	Java	Leetcode
107	171	Anagrams.java	Medium	Java	Lintcode
108	438	Find All Anagrams in String.java	Medium	Java	Leetcode
XXX	438	template for sliding window
109	263	Ugly Number	Easy	Java	leetcode
110	264	Ugly Number II Dynamic Programming Merge Sort Idea	Medum	Java	Leetcode
111	692	Top K Frequent Words.java	Medium	Java	Leetcode
112	613	High Five.java	Medium	Java	Lintcode
113	401	Kth Smallest Number in Sorted Matrix.java	Medium	Java	Lintcode
114	109	Triangle.java	Easy	Java	Lintcode
115	64	Minimum Path Sum.java	Medium	Java	Leetcode
116	62	Unique Paths.java	Medium	Java	Leetcode
117	63	Unique Paths II.java	Medium	Java	Leetcode
118	300	Longest Increasing Subsequence Binary Search DP Very Good	Medium	Java	Leetcode
119	368	Largest Divisible Subset.java	Medium	Java	Leetcode
120	91	Decode Ways.java	Medium	Java	Leetcode
121	179	Largest Number Compartor	Medium	Java	Leetcode
122	713	Subarray Product Less Than K.java	Medium	Java	Leetcode
123	152	Maximum Product Subarray.java	Medium	Java	Leetcode
124	406	Minimum Size Subarray Sum.java	Medium	Java	Lintcode
125	44	Minimum Subarray.java	Easy	Java	Lintcode
126	121	Best Time to Buy and Sell Stock.java	Easy	Java	Leetcode
127	122	Best Time to Buy and Sell Stock II.java	Easy	Java	Leetcode
128	123	Best Time to Buy and Sell Stock III.java	Hard	Java	Leetcode
129	188	Best Time to Buy and Sell Stock IV.java	Hard	Java	Leetcode
130	714	Best Time to Buy and Sell Stock with Fee	Medium	Java	Leetcode
131	344	ReverseString.java	Easy	Java	Leetcode
132	347	Top K Frequent Elements.java	Medium	Java	Leetcode
134	136	Single Number.java	Easy	Java	Leetcode
135	20	Valid Parentheses.java	Easy	Java	Leetcode
136	206	Reverse LinkedList.java	Easy	Java	Leetcode
137	572	Subtree of Another Tree.java	Easy	Java	Leetcode
138	223	Rectangle Area.java	Medium	Java	Leetcode
139	239	Sliding Window Maximum.java	Hard	Java	Leetcode
140	48	Rotate Image.java	Medium	Java	Leetcode
141	141	Linked List Cycle	Easy	Java	Leetcode
142	142	Linked List Cycle II	Medium	Java	Leetcode
143	129	Sum Root to Leaf Numbers recursion	Medium	Java	Leetcode
144	413	Arithmetic Slices.java	Medium	Java	Leetcode
145	328	OddEvenLinkedList.java	Medium	Java	Leetcode
146	92	ReverseLinkedListII.java	Medium	Java	Leetcode
147	160	Intersection of Two Linked Lists.java	Easy	Java	Leetcode
148	203	Remove Linked List Elements.java	Easy	Java	Leetcode
149	49	Group Anagrams.java	Medium	Java	Leetcode
150	73	Set Matrix Zeroes.java	Medium	Java	Leetcode
151	78	Subsets.java	Medium	Java	Leetcode
152	89	Gray Code Bit manipulation	Medium	Java	Leetcode
153	98	Validate Binary Search Tree Good	Medium	Java	Leetcode
154	119	Pascal's triangle II.java	Easy	Java	leetcode
155	155	Min Stack.java	Easy	Java	Leetcode
156	167	Two Sum II.java	Easy	Java	Leetcode
157	189	Rotate Array Very Good	Easy	Java	Leetcode
158	151	Reverse Words in a String.java	Medium	Java	Leetcode
159	186	Reverse Words in a String II Very Good	Medium	Java	Leetcode
160	199	Binary Tree Right Side View.java	Medium	Java	Leetcode
161	205	Isomorphic Strings.java	Easy	Java	Leetcode
162	204	Count Primes.java	Easy	Java	Leetcode
163	234	Palindrome Linked List.java	Easy	Java	Leetcode
164	279	Perfect Squares.java	Medium	Java	Leetcode
165	237	Delete Node in a Linked List.java	Easy	Java	Leetcode
166	238	Product of Array Except Self.java	Medium	Java	Leetcode
167	380	Insert Delete GetRandom Load Balancer.java	Medium	Java	Leetcode
168	387	First Unique Character in a String.java	Easy	Java	Leetcode
169	617	Merge Two Binary Trees Very Good	Easy	Java	Leetcode
170	682	BaseballGame.java	Easy	Java	Leetcode
171	297	Serialize and Deserialize Binary Tree.java	Hard	Java	Leetcode
172	763	Partition Labels Very Good	Medium	Java	Leetcode
XXX	XXX	distance between two nodes of BinarySearchTree
173	678	Valid Parenthesis String.java	Medium	Java	Leetcode
174	627	Longest Palindrome.java	Easy	Java	Lintcode
175	726	Check Valid Full Binary Tree.java	Medium	Java	Lintcode
176	728	Three Distinct Factors.java	Medium	Java	Lintcode
177	772	Group Anagrams.java	Medium	Java	Lintcode
178	735	Maximum From the Right.java	Medium	Java	Lintcode
179	451	Sort Characters By Frequency.java	Medium	Java	Leetcode
180	532	K-diff Pairs in an Array.java	Easy	Java	Leetcode
181	28	Implement strStr.java	Easy	Java	Leetcode
182	96	Partition List.java	Medium	Java	Lintcode
183	511	Swap Two Nodes in Linked List.java	Medium	Java	Lintcode
184	99	Reorder List.java	Medium	Java	Lintcode
185	170	Rotate List Good	Medium	Java	Lintcode
186	106	Convert Sorted List to Balanced BST.java	Medium	Java	Lintcode
187	6	Merge Two Sorted Arrays.java	Easy	Java	Lintcode
188	57	Three Sum.java	Medium	Java	Lintcode
189	382	Triangle Count.java	Medium	Java	Lintcode
190	49	Sort Letters by Case.java	Medium	Java	Lintcode
191	37	Partition Array by Odd and Even.java	Easy	Java	Lintcode
192	144	Interleaving Positive and Negative	Medium	Java	Lintcode
193	111	Climbing Stairs.java	Easy	Java	Lintcode
194	116	Jump Game.java	Medium	Java	Lintcode
195	117	Jump Game II.java	Medium	Java	Lintcode
196	604	Window Sum.java	Easy	Java	Lintcode
197	80	Remove Duplicates from Sorted Array II.java	Medium	Java	Leetcode
198	88	Merge Sorted Array.java	Easy	Java	Leetcode
199	287	Find Duplicate Number Binary Search Good	Medium	Java	Leetcode
200	111	Minimum Depth of Binary Tree.java	Easy	Java	Leetcode
201	22	Generate Parentheses Recursion Very Good	Medium	Java	Leetcode
202	131	Palindrome Partitioning.java	Medium	Java	Leetcode
203	545	Boundary of Binary Tree.java	Medium	Java	Leetcode
204	42	Trapping Rain Water.java	Hard	Java	Leetcode
205	675	Cut Off Trees for Golf Event.java	Hard	Java	Leetcode
206	460	LFU Cache.java	Hard	Java	Leetcode
207	725	Split Linked Listin Parts.java	Medium	Java	Leetcode
208	529	Minesweeper.java	Medium	Java	Leetcode
209	508	Most Frequent SubtreeSum.java	Medium	Java	Leetcode
210	414	Third Maximum Number.java	Easy	Java	Leetcode
211	538	Convert BST to Greater Tree.java	Easy	Java	Leetcode
212	775	Global Local Inversions.java	Medium	Java	Leetcode
213	771	Jewels and Stones.java	Easy	Java	Leetcode
214	746	Min Cost Climbing Stairs.java	Easy	Java	Leetcode
215	70	Climbing Stairs.java	Easy	Java	Leetcode
216	662	Maximum Width of Binary Tree.java	Medium	Java	Leetcode
217	661	Image Smoother.java	Easy	Java	Leetcode
218	646	Maximum Length of Pair Chain.java	Medium	Java	Leetcode
219	645	Set Mismatch.java	Easy	Java	Leetcode
220	606	Construct String from Binary Tree.java	Easy	Java	Leetcode
221	536	Construct Binary Tree from String.java	Medium	Java	Leetcode
222	553	Optimal Division.java	Medium	Java	Leetcode
223	459	Repeated Substring Pattern.java	Easy	Java	Leetcode
224	686	Repeated String Match.java	Easy	Java	Leetcode
225	396	Rotate Function.java	Medium	Java	Leetcode
226	14	Longest Common Prefix.java	Easy	Java	Leetcode
227	31	Next Permutation.java	Medium	Java	Leetcode
228	38	Count and Say.java	Easy	Java	Leetcode
229	41	First Missing Positive.java	Hard	Java	Leetcode
230	54	Spiral Matrix.java	Medium	Java	Leetcode
231	76	Minimum Window Substring Sliding Window Very Good	Hard	Java	Leetcode
232	103	Binary Tree Zigzag Level Order Traversal.java	Medium	Java	Leetcode
233	105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Java	Leetcode
234	106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	Java	Leetcode
235	108	Convert Sorted Array to Binary Search Tree	Easy	Java	Leetcode
236	114	Flatten Binary Tree to Linked List Very Good	Medium	Java	Leetcode
237	124	Binary Tree Maximum Path Sum Very Good	Hard	Java	Leetcode
238	133	Clone Graph DFS BFS Good	Medium	Java	Leetcode
239	134	Gas Station.java	Medium	Java	Leetcode
240	145	Binary Tree Postorder Traversal	Hard	Java	Leetcode
241	150	Evaluate Reverse Polish Notation.java	Medium	Java	Leetcode
242	162	Find Peak Element.java	Medium	Java	Leetcode
243	166	Fraction to Recurring Decimal	Medium	Java	Leetcode
244	169	Majority Element.java	Easy	Java	Leetcode
245	171	Excel Sheet Column Number	Easy	Java	Leetcode
246	168	Excel Sheet Column Title	Easy	Java	Leetcode
247	172	Factorial Trailing Zeroes.java	Easy	Java	Leetcode
248	174	Dungeon Game.java	Hard	Java	Leetcode
249	198	House Robber.java	Easy	Java	Leetcode
250	202	Happy Number.java	Easy	Java	Leetcode
251	208	Implement Trie.java	Medium	Java	Leetcode
252	213	House Robber II.java	Medium	Java	Leetcode
253	230	Kth Smallest Element in a BST Good	Medium	Java	Leetcode
254	671	Second Minimum Node In a Binary Tree	Easy	Java	Leetcode
255	251	Flatten 2D Vector.java	Medium	Java	Leetcode
256	252	Meeting Rooms.java	Easy	Java	Leetcode
257	253	Meeting Rooms II TreeMap Sweep line	Medium	Java	Leetcode
258	269	Alien Dictionary Topological sort Very good	Hard	Java	Leetcode
259	289	Game of Life.java	Medium	Java	Leetcode
260	225	Implement Stack Using Queue.java	Medium	Java	Leetcode
261	295	Find Median from Data Stream.java	Hard	Java	Leetcode
262	322	Coin Change Dynamic Programming	Medium	Java	Leetcode
263	280	Wiggle Sort.java	Medium	Java	Leetcode
264	324	Wiggle Sort II.java	Medium	Java	Leetcode
265	329	Longest Increasing Path DFS + Memo	Hard	Java	Leetcode
266	334	Increasing Triplet Subsequence.java	Medium	Java	Leetcode
267	340	Longest Substring with At Most K Distinct Characters	Hard	Java	Leetcode
268	348	Design Tic Tac Toe Good	Medium	Java	Leetcode
269	349	Intersection of Two Arrays	Easy	Java	Leetcode
270	350	Intersection of Two Arrays II	Easy	Java	Leetcode
271	371	Sum of Two Integers	Easy	Java	Leetcode
272	382	Reservoir Sampling Linked List Random Node	Medium	Java	Leetcode
273	398	Reservoir Sampling Random Pick Index	Medium	Java	Leetcode
274	384	Reservoir Shuffle an Array	Medium	Java	Leetcode
275	395	Longest Substring with At Least K Repeating Characters Sliding Window Very good	Medium	Java	Leetcode
276	412	Fizz Buzz	Easy	Java	Leetcode
277	454	4Sum II	Medium	Java	Leetcode
278	611	Valid Triangle Number	Medium	Java	Leetcode
279	259	3Sum Smaller	Medium	Java	Leetcode
280	733	Flood Fill	Easy	Java	Leetcode
281	547	Union Find Friend Circles	Medium	Java	Leetcode
282	140	Word Break II Recursion + Memo	Hard	Java	Leetcode
283	805	Maxium Association Set	Medium	Java	Lintcode
284	79	Word Search backtracking	Medium	Java	Leetcode
285	212	Word Search II backtracking Trie	Hard	Java	Leetcode
286	336	Palindrome Pair	Hard	Java	Leetcode
287	549	Binary Tree Longest Consecutive Sequence II Very Good	Medium	Java	Leetcode
288	44	Wildcard Matching	Hard	Java	Leetcode
289	10	Regular Expression Matching	Hard	Java	Leetcode
290	243	Shortest Word Distance	Easy	Java	Leetcode
291	244	Shortest Word Distance II	Medium	Java	Leetcode
292	245	Shortest Word Distance III	Medium	Java	Leetcode
293	9	Palindrome Number.java	Easy	Java	Leetcode
294	19	Remove Nth Node From End of List	Medium	Java	Leetcode
295	36	Valid Sudoku	Medium	Java	Leetcode
296	229	Majority Element II	Medium	Java	Leetcode
297	384	Longest Substring Without Repeating Characters	Medium	Java	Lintcode
XXX	XXX	Union Find Template
298	305	Number of Islands II	Hard	Java	Leetcode
299	364	Trapping Rain Water II	Hard	Java	Lintcode
300	81	Data Stream Median	Hard	Java	Lintcode
301	575	Expression Expand	Medium	Java	Lintcode
302	84	Largest Rectangle in Histogram Monotonic Stack Very Good	Hard	Java	Leetcode
303	85	Maximal Rectangle Very Good	Hard	Java	Leetcode
304	385	Sliding Window Maximum	Hard	Java	Leetcode
305	141	Sqrt square	Easy	Java	Lintcode
306	437	Copy Books	Hard	Java	Lintcode
307	362	Sliding Window Maximum	Hard	Java	Lintcode
308	643	Maximum Average Subarray I	Easy	Java	Leetcode
309	644	Maximum Average Subarray II	Hard	Java	Leetcode
310	391	Number of Airplanes in the Sky	Medium	Java	Lintcode
311	221	Maximal Square	Medium	Java	Leetcode
312	397	Longest Increasing Continuous Subsequence	Easy	Java	Lintcode
313	398	Longest Increasing Continuous Subsequence 2D (memorization)	Hard	Java	Lintcode
314	394	Coins in a Line I	Medium	Java	Lintcode
315	395	Coins in a Line II	Medium	Java	Lintcode
316	312	Burst Balloons	Hard	Java	Leetcode
317	77	Longest Common Subsequence (LCS)	Medium	Java	Lintcode
318	79	Longest Common Substring	Medium	Java	Lintcode
319	92	Backpack	Medium	Java	Lintcode
320	125	Backpack II	Medium	Java	Lintcode
312	89	k sum	Hard	Java	Lintcode
313	402	Continuous Subarray Sum	Medium	Java	Lintcode
314	22	Flatten List.java	Easy	Java	Lintcode
315	86	Binary Search Tree Iterator	Hard	Java	Lintcode
316	694	Number of Distinct Islands	Medium	Java	Leetcode
317	127	Word Ladder	Medium	Java	Leetcode
318	240	Search 2D Matrix II Good	Medium	Java	Leetcode
319	518	Coin Change 2	Medium	Java	Leetcode
320	537	Complex Number Multiplication	Medium	Java	Leetcode
321	663	Equal Tree Partition Tree Sum	Medium	Java	Leetcode
322	791	Custom Sort String	Medium	Java	Leetcode
323	742	Closest Leaf in a Binary Tree	Medium	Java	Leetcode
324	776	Split BST	Medium	Java	Leetcode
325	8	String to Integer (atoi)	Medium	Java	Leetcode
326	11	Container With Most Water	Medium	Java	Leetcode
327	35	Search Insert Position	Easy	Java	Leetcode
328	24	Swap Nodes in Pairs	Medium	Java	Leetcode
329	43	Multiply Strings Good	Medium	Java	Leetcode
330	18	4Sum	Medium	Java	Leetcode
331	30	Substring with Concatenation of All Words	Hard	Java	Leetcode
332	59	Spiral Matrix II	Medium	Java	Leetcode
333	60	Permutation Sequence	Medium	Java	Leetcode
334	66	Plus One	Easy	Java	Leetcode
335	100	Same Tree	Easy	Java	Leetcode
336	90	Subsets II	Medium	Java	Leetcode
337	77	Combinations	Medium	Java	Leetcode
338	81	Search in Rotated Sorted Array II Very Good	Medium	Java	Leetcode
339	83	Remove Duplicates from Sorted List	Easy	Java	Leetcode
340	82	Remove Duplicates from Sorted List II	Medium	Java	Leetcode
341	101	Symmetric Tree Good	Easy	Java	Leetcode
342	107	Binary Tree Level Order Traversal II	Easy	Java	Leetcode
343	125	Valid Palindrome	Easy	Java	Leetcode
344	96	Unique Binary Search Trees (Catalan Number)	Medium	Java	Leetcode
345	95	Unique Binary Search Trees II	Medium	Java	Leetcode
346	87	Scramble String	Hard	Java	Leetcode
347	97	Interleaving String	Hard	Java	Leetcode
348	118	Pascal's Triangle	Easy	Java	Leetcode
349	99	Recover Binary Search Tree	Hard	Java	Leetcode
350	93	Restore IP Addresses	Medium	Java	Leetcode
351	116	Populating Next Right Pointers in Each Node	Medium	Java	Leetcode
352	117	Populating Next Right Pointers in Each Node II Good	Medium	Java	Leetcode
353	147	Insertion Sort List	Medium	Java	Leetcode
354	153	Find Minimum in Rotated Sorted Array	Medium	Java	Leetcode
355	154	Find Minimum in Rotated Sorted Array II	Hard	Java	Leetcode
356	231	Power of Two	Easy	Java	Leetcode
357	535	Encode and Decode TinyURL	Medium	Java	Leetcode
358	211	Add and Search Word Trie DFS Good	Medium	Java	Leetcode
359	187	Repeated DNA Sequences	Medium	Java	Leetcode
360	216	Combination Sum III	Medium	Java	Leetcode
361	214	Shortest Palindrome	Hard	Java	Leetcode
362	219	Contains Duplicate II	Easy	Java	Leetcode
363	220	Contains Duplicate III TreeSet TreeMap	Medium	Java	Leetcode
364	226	Invert Binary Tree	Easy	Java	Leetcode
365	258	Add Digits	Easy	Java	Leetcode
366	222	Count Complete Tree Nodes Very Good	Medium	Java	Leetcode
367	218	Skyline Very Good PriorityQueue Sweep Line	Hard	Java	Leetcode
368	228	Summary Ranges	Medium	Java	Leetcode
369	224	Basic Calculator Stack Good	Hard	Java	Leetcode
370	225	Basic Calculator II No Stack Good	Medium	Java	Leetcode
371	246	Strobogrammatic Numbe	Easy	Java	Leetcode
372	247	Strobogrammatic Numbe II	Medium	Java	Leetcode
373	249	Group Shifted Strings	Medium	Java	Leetcode
374	250	Count Univalue Subtrees	Medium	Java	Leetcode
375	254	Factor Combinations	Medium	Java	Leetcode
376	255	Verify preorder in binary search tree montonic stack	Medium	Java	Leetcode
377	256	Paint House	Easy	Java	Leetcode
378	274	H-Index	Medium	Java	Leetcode
379	275	H-Index II	Medium	Java	Leetcode
380	241	Different Ways to Add Parentheses Divide and Conquer	Medium	Java	Leetcode
381	290	Word Pattern	Easy	Java	Leetcode
382	284	Peeking Iterator	Medium	Java	Leetcode
383	292	Nim Game	Easy	Java	Leetcode
384	299	Bulls and Cows	Medium	Java	Leetcode
385	282	Expression Add Operators Backtracking	Hard	Java	Leetcode
386	318	Maximum Product of Word Lengths bit compare two words	Medium	Java	Leetcode
387	303	Range Sum Query - Immutable preSum Array	Easy	Java	Leetcode
388	304	Range Sum Query 2D 2D preSum Array	Medium	Java	Leetcode
389	310	Minimum Height Trees topological sort graph	Medium	Java	Leetcode
390	367	Valid Perfect Square	Easy	Java	Leetcode
391	331	Verify Preorder Serialization of a Binary Tree	Medium	Java	Leetcode
392	337	House Robber III Tree DP Very Good	Medium	Java	Leetcode
393	315	Count of Smaller Numbers After Self	Hard	Java	leetcode
394	332	Reconstruct Itinerary Backtracking	Medium	Java	Leetcode
395	373	Find K Pairs with Smallest Sums	Medium	Java	Leetcode
396	345	Reverse Vowels of a String	Easy	Java	Leetcode
397	321	Create Maximum Number	Hard	Java	Leetcode
398	32	Longest Valid Parentheses two pointers	Hard	Java	Leetcode
399	581	Shortest Unsorted Continuous Subarray two pointers	Easy	Java	Leetcode
400	494	Target Sum Add Operator DFS or Backpack DP Very Good	Medium	Java	Leetcode
401	543	Diameter of Binary Tree Good	Easy	Java	Leetcode
402	394	Decode String Stack Very Good	Medium	Java	Leetcode
403	437	Path Sum III Good Recursion	Easy	Java	Leetcode
404	448	Find All Numbers Disappeared in an Array	Easy	Java	Leetcode
405	416	Partition Equal Subset Sum Backpack DP Very Good	Medium	Java	Leetcode
406	461	Hamming Distance bit	Easy	Java	Leetcode
407	647	Palindromic Substrings Dynamic Programming	Medium	Java	Leetcode
408	301	Remove Invalid Parentheses BFS Very Good	Hard	Java	Leetcode
409	338	Counting Bits	Medium	Java	Leetcode
410	406	Queue Reconstruction by Height	Medium	Java	Leetcode
411	309	Best Time to Buy and Sell Stock with Cooldown	Medium	Java	Leetcode
412	621	Task Scheduler Very Good	Medium	Java	Leetcode
413	191	Number of 1 Bits	Easy	Java	Leetcode
414	190	Reverse Bits	Easy	Java	Leetcode
415	326	Power of Three	Easy	Java	Leetcode
416	137	Single Number II	Medium	Java	Leetcode
417	260	Single Number III	Medium	Java	Leetcode
418	342	Power of Four	Easy	Java	Leetcode
419	343	Integer break	Medium	Java	Leetcode
420	374	Guess Number	Easy	Java	Leetcode
421	377	Combination Sum IV	Medium	Java	Leetcode
422	389	Find the Difference	Easy	Java	Leetcode
423	376	Wiggle Subsequence	Medium	Java	Leetcode
424	415	Add Strings	Easy	Java	Leetcode
425	381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	Java	Leetcode
426	405	Convert a Number to Hexadecimal	Easy	Java	Leetcode
427	404	Sum of Left Leaves	Easy	Java	Leetcode
428	417	Pacific Atlantic Water Flow	Medium	Java	Leetcode
429	392	Is subsequence	Medium	Java	Leetcode
430	383	Ransom Note	Easy	Java	Leetcode
431	386	Lexicographical Numbers	Medium	Java	Leetcode
432	410	Split Array Largest Sum Binary Search Very Good	Hard	Java	Leetcode
433	424	Longest Repeating Character Replacement Sliding Window	Medium	Java	Leetcode
434	433	Minimum Genetic Mutation BFS	Medium	Java	Leetcode
435	434	Number of Segments in a String split	Easy	Java	Leetcode
436	435	Non-overlapping Intervals	Medium	Java	Leetcode
437	447	Number of Boomerangs	Easy	Java	Leetcode
438	442	Find All Duplicates in an Array	Medium	Java	Leetcode
439	541	Reverse String II	Easy	Java	Leetcode
440	452	Minimum Number of Arrows to Burst Balloons Interval Very Good	Medium	Java	Leetcode
441	530	Minimum Absolute Difference in BST	Easy	Java	Leetcode
442	539	Minimum Time Difference	Medium	Java	Leetcode
443	500	Keyboard Row	Easy	Java	Leetcode
444	463	Island Perimeter	Easy	Java	Leetcode
445	453	Minimum Moves to Equal Array Elements	Easy	Java	Leetcode
446	462	Minimum Moves to Equal Array Elements II	Medium	Java	Leetcode
447	476	Number Complement	Easy	Java	Leetcode
448	455	Assign Cookies	Easy	Java	Leetcode
449	445	Add Two Numbers II	Medium	Java	Leetcode
450	450	Delete Node in a BST Recursion/Divide Conquer	Medium	Java	Leetcode
451	501	Find Mode in Binary Search Tree	Easy	Java	Leetcode
452	496	Next Greater Element I Monotonic Stack	Easy	Java	Leetcode
453	503	Next Greater Element II Monotonic Stack	Medium	Java	Leetcode
454	556	Next Greater Element III	Medium	Java	Leetcode
455	443	String Compression Two Pointers Good	Easy	Java	Leetcode
456	456	132 Pattern Monotonic Stack	Hard	Java	Leetcode
457	467	Unique Substrings in Wraparound String	Medium	Java	Leetcode
458	520	Detect Capital	Easy	Java	Leetcode
459	525	Contiguous Array HashMap	Medium	Java	Leetcode
460	540	Single Element in a Sorted Array	Medium	Java	Leetcode
461	557	Reverse Words in a String III	Easy	Java	Leetcode
462	523	Continuous Subarray Sum	Medium	Java	Leetcode
463	524	Longest Word in Dictionary through Deleting	Medium	Java	Leetcode
464	441	Arranging Coins	Easy	Java	Leetcode
465	436	Find Right Interval TreeMap	Medium	Java	Leetcode
466	485	Max Consecutive Ones	Easy	Java	Leetcode
467	513	Find Bottom Left Tree Value	Medium	Java	Leetcode
468	506	Relative Ranks	Easy	Java	Leetcode
469	474	Ones and Zeroes Dynamic Programming	Medium	Java	Leetcode
470	563	Binary Tree Tilt	Easy	Java	Leetcode
471	565	Array Nesting	Medium	Java	Leetcode
472	554	Brick Wall	Medium	Java	Leetcode
473	566	Reshape the Matrix	Easy	Java	Leetcode
474	567	Permutation in String Sliding Window	Medium	Java	Leetcode
475	575	Distribute candies	Easy	Java	Leetcode
476	583	Delete Operation for Two Strings	Medium	Java	Leetcode
477	156	Binary Tree Upside Down Reverse Tree	Medium	Java	Leetcode
478	159	Longest Substring with At Most Two Distinct Characters	Hard	Java	Leetcode
479	170	Two Sum III - Data structure design	Easy	Java	Leetcode
480	265	Paint House II	Hard	Java	Leetcode
481	266	Palindrome Permutation	Easy	Java	Leetcode
482	267	Palindrome Permutation II Backtracking	Medium	Java	Leetcode
483	293	Flip Game	Easy	Java	Leetcode
484	294	Flip Game II recursion/memorization	Medium	Java	Leetcode
485	281	Zigzag Iterator	Medium	Java	Leetcode
486	271	Encode and Decode Strings	Medium	Java	Leetcode
487	276	Paint Fence	Easy	Java	Leetcode
488	296	Best Meeting Point	Hard	Java	Leetcode
489	339	Nested List Weight Sum	Easy	Java	Leetcode
490	346	Moving Average from Data Stream	Easy	Java	Leetcode
491	320	Generalized Abbreviation	Medium	Java	Leetcode
492	357	Count Numbers with Unique Digits	Medium	Java	Leetcode
493	359	Logger Rate Limiter	Easy	Java	Leetcode
494	360	Sort Transformed Array	Medium	Java	Leetcode
495	362	Design Hit Counter	Medium	Java	Leetcode
496	364	Nested List Weight Sum II	Medium	Java	Leetcode
497	366	Find Leaves of Binary Tree Java Concept	Medium	Java	Leetcode
498	369	Plus One Linked List	Medium	Java	Leetcode
499	370	Range Addition Range Caching	Medium	Java	Leetcode
500	408	Valid Word Abbreviation	Easy	Java	Leetcode
501	422	Valid Word Square	Easy	Java	Leetcode
502	418	Sentence Screen Fitting	Medium	Java	Leetcode
503	439	Ternary Expression Parser	Medium	Java	Leetcode
504	484	Find Permutation	Medium	Java	Leetcode
505	681	Next Closest Time	Medium	Java	Leetcode
506	325	Maximum Size Subarray Sum Equals k Very Good	Medium	Java	Leetcode
507	272	Closest Binary Search Tree Value II	Hard	Java	Leetcode
508	624	Maximum Distance in Arrays	Easy	Java	Leetcode
509	351	Android Unlock Patterns	Medium	Java	Leetcode
510	544	Output Contest Matches	Medium	Java	Leetcode
511	616	Add Bold Tag in String Merge Interval	Medium	Java	Leetcode
512	758	Bold Words in String	Medium	Java	Leetcode
513	490	Maze I BFS DFS	Medium	Java	Leetcode
514	505	Maze II BFS DFS Dijstra Very Good	Medium	Java	Leetcode
515	499	Maze III BFS DFS	Hard	Java	Leetcode
516	562	Longest Line of Consecutive One in Matrix	Medium	Java	Leetcode
517	635	Design Log Storage System	Medium	Java	Leetcode
518	734	Sentence Similarity	Easy	Java	Leetcode
519	737	Sentence Similarity II build graph and Union Find	Medium	Java	Leetcode
520	760	Find Anagram Mapping	Easy	Java	Leetcode
521	504	Base 7	Easy	Java	Leetcode
522	516	Longest Palindromic Subsequence Dynamic Programming	Medium	Java	Leetcode
523	730	Count Different Palindromic Subsequences Challenging DP	Hard	Java	Leetcode
524	594	Longest Harmonious Subsequence HashMap	Easy	Java	Leetcode
525	599	Minimum Index Sum of Two Lists	Easy	Java	Leetcode
526	628	Maximum Product of Three Numbers	Easy	Java	Leetcode
527	633	Sum of Square Numbers Two points	Easy	Java	Leetcode
528	623	Add One Row to Tree	Medium	Java	Leetcode
529	637	Average of Levels in Binary Tree	Easy	Java	Leetcode
530	638	Shopping Offers DFS meomo	Medium	Java	Leetcode
531	653	Two Sum IV - Input is a BST	Easy	Java	Leetcode
532	648	Replace Words Trie	Medium	Java	Leetcode
533	665	Non-decreasing Array	Medium	Java	Leetcode
534	652	Find Duplicate Subtrees Recursion/Serialization	Medium	Java	Leetcode
535	654	Maximum Binary Tree	Medium	Java	Leetcode
536	657	Judge Route Circle	Easy	Java	Leetcode
537	659	Split Array into Consecutive Subsequences Greedy	Medium	Java	Leetcode
538	669	Trim a Binary Search Tree	Easy	Java	Leetcode
539	670	Maximum Swap number	Medium	Java	Leetcode
540	526	Beautiful Arrangement backtracking	Medium	Java	Leetcode
541	515	Find Largest Value in Each Tree Row	Medium	Java	Leetcode
542	531	Lonely Pixel I Matrix	Medium	Java	Leetcode
543	477	Total Hamming Distance	Medium	Java	Leetcode
544	473	Matchsticks to Square Backtracking Partition	Medium	Java	Leetcode
545	491	Increasing Subsequences Backtracking	Medium	Java	Leetcode
546	498	Diagonal Traverse	Medium	Java	Leetcode
547	542	01 Matrix another kind of BFS	Medium	Java	Leetcode
548	680	Valid Palindrome II	Easy	Java	Leetcode
549	677	Map Sum Pairs Trie	Medium	Java	Leetcode
550	695	Max Area of Island	Easy	Java	Leetcode
551	696	Count Binary Substrings Very Good	Easy	Java	Leetcode
552	698	Partition to K Equal Sum Subsets Backtracking Partition Very Good	Medium	Java	Leetcode
553	712	Minimum ASCII Delete Sum for Two Strings Dynamic Programming	Medium	Java	Leetcode
554	720	Longest Word in Dictionary Trie	Medium	Java	Leetcode
555	718	Maximum Length of Repeated Subarray Dynamic Programming	Medium	Java	Leetcode
556	724	Find Pivot Index	Easy	Java	Leetcode
557	728	Self Dividing Numbers	Easy	Java	Leetcode
558	729	My Calendar I	Medium	Java	Leetcode
559	731	My Calendar II TreeMap Sweep line	Medium	Java	Leetcode
560	732	My Calendar III TreeMap Sweep line	Hard	Java	Leetcode
561	735	Asteroid Collision	Medium	Java	Leetcode
562	402	Remove K Digits monotonic stack	Medium	Java	Leetcode
563	738	Monotone Increasing Digits	Medium	Java	Leetcode
564	739	Daily Temperatures Monotonic Stack	Medium	Java	Leetcode
565	740	Delete and Earn Dynamic Programming and TreeMap	Medium	Java	Leetcode
566	747	Largest Number At Least Twice of Others	Easy	Java	Leetcode
567	744	Find Smallest Letter Greater Than Target Binary Search	Easy	Java	Leetcode
568	743	Network Delay Time Graph Dijkstra Very Good	Medium	Java	Leetcode
569	750	Number Of Corner Rectangles HashMap	Medium	Java	Leetcode
570	784	Letter Case Permutation Recursion	Easy	Java	Leetcode
571	766	Toeplitz Matrix	Easy	Java	Leetcode
572	767	Reorganize String	Medium	Java	Leetcode
573	769	Max Chunks To Make Sorted	Medium	Java	Leetcode
574	768	Max Chunks To Make Sorted II	Hard	Java	Leetcode
575	788	Rotated Digits	Easy	Java	Leetcode
576	787	Cheapest Flights Within K Stops Graph Dijkstra	Hard	Java	Leetcode
577	796	Rotate String	Easy	Java	Leetcode
578	797	All Paths From Source to Target	Medium	Java	Leetcode
579	800	Similar RGB Color	Easy	Java	Leetcode
580	792	Number of Matching Subsequences	Medium	Java	Leetcode
581	795	Number of Subarrays with Bounded Maximum	Medium	Java	Leetcode
582	804	Unique Morse Code Words	Easy	Java	Leetcode
583	801	Minimum Swaps To Make Sequences Increasing Very good Two Alternate 1D DP	Medium	Java	Leetcode
584	807	Max Increase to Keep City Skyline	Medium	Java	Leetcode
585	814	Binary Tree Pruning	Medium	Java	Leetcode
586	806	Number of Lines To Write String	Easy	Java	Leetcode
587	812	Largest Triangle Area	Easy	Java	Leetcode
588	811	Subdomain Visit Count	Easy	Java	Leetcode
589	819	Most Common Word	Easy	Java	Leetcode
590	813	Largest Sum of Averages 2D DP + 1D DP	Medium	Java	Leetcode
591	821	Shortest Distance to a Character Good	Easy	Java	Leetcode
592	817	Linked List Components	Medium	Java	Leetcode
593	832	Flipping an Image	Easy	Java	Leetcode
594	830	Positions of Large Groups Two pointers	Easy	Java	Leetcode
595	824	Goat Latin	Easy	Java	Leetcode
596	829	Consecutive Numbers Sum	Medium	Java	Leetcode
597	842	Split Array into Fibonacci Sequence Backtracking	Medium	Java	Leetcode
598	851	Loud and Rich DFS + memorization	Medium	Java	Leetcode
599	517	Super Washing Machines	Hard	Java	Leetcode
600	273	Integer to English Words	Hard	Java	Leetcode
601	268	Missing Number	Easy	Java	Leetcode
602	689	Maximum Sum of 3 Non-Overlapping Subarrays Dynamic Programming Very Good	Hard	Java	Leetcode
603	721	Accounts Merge DFS Union Find	Medium	Java	Leetcode
604	673	Number of Longest Increasing Subsequence Two Dynamic Programming	Medium	Java	Leetcode
605	785	Is Graph Bipartite Color DFS	Medium	Java	Leetcode
606	764	Largest Plus Sign Directional Dynamic Programming	Medium	Java	Leetcode
607	825	Friends Of Appropriate Ages	Medium	Java	Leetcode
608	71	Simplify Path Stack	Medium	Java	Leetcode
609	91	Decode Ways	Medium	Java	Leetcode
610	639	Decode Ways II	Medium	Java	Leetcode
611	642	Design Search Autocomplete System Trie	Hard	Java	Leetcode
612	165	Compare Version Numbers Split	Medium	Java	Leetcode
613	285	Inorder Successor in BST Very good	Medium	Java	Leetcode
614	333	Largest BST Subtree Very Good	Medium	Java	Leetcode
615	650	2 Keys Keyboard Dynamic Programming	Medium	Java	Leetcode
616	651	4 Keys Keyboard Dynamic Programming	Medium	Java	Leetcode
617	419	Battleships in a Board	Medium	Java	Leetcode
618	805	Split Array With Same Average Very Good DFS	Hard	Java	Leetcode
619	582	Kill Process DFS BFS	Medium	Java	Leetcode
620	636	Exclusive Time of Functions Stack Good	Medium	Java	Leetcode
621	605	Can Place Flowers Greedy	Easy	Java	Leetcode
622	464	Can I win DFS + Memo	Medium	Java	Leetcode
623	486	Predict the Winner DP MinMax	Medium	Java	Leetcode
624	844	Backspace String Compare	Easy	Java	Leetcode
625	799	Champagne Tower	Medium	Java	Leetcode
626	479	Largest Palindrome Product	Medium	Java	Leetcode
627	164	Maximum Gap	Hard	Java	Leetcode
628	752	Open the Lock BFS	Medium	Java	Leetcode
629	840	Magic Squares In Grid	Easy	Java	Leetcode
630	849	Maximize Distance to Closest Person	Easy	Java	Leetcode
631	838	Push Dominoes	Medium	Java	Leetcode
632	802	Find Eventual Safe States Classic Color DFS	Medium	Java	Leetcode
633	778	Swim in Rising Water PriorityQueue	Hard	Java	Leetcode
634	852	Peak Index in a Mountain Array	Easy	Java	Leetcode
635	815	Bus Routes BFS	Hard	Java	Leetcode
636	826	Most Profit Assigning Work	Medium	Java	Leetcode
637	827	Making A Large Island	Hard	Java	Leetcode
638	828	Unique Letter String	Hard	Java	Leetcode
639	867	Transpose Matrix	Easy	Java	Leetcode
640	833	Find And Replace in String	Medium	Java	Leetcode
641	841	Keys and Rooms Classic DFS BFS	Medium	Java	Leetcode
642	845	Longest Mountain in Array	Medium	Java	Leetcode
643	846	Hand of Straights	Medium	Java	Leetcode
644	848	Shifting Letters Prefix Sum	Medium	Java	Leetcode
645	856	Score of Parentheses Stack Very Good	Medium	Java	Leetcode
646	860	Lemonade Change	Easy	Java	Leetcode
647	859	Buddy String	Easy	Java	Leetcode
648	861	Score After Flipping Matrix Greedy	Medium	Java	Leetcode
649	858	Mirror Reflection	Medium	Java	Leetcode
650	834	Sum of Distances in Tree Very Good Tree Graph	Hard	Java	Leetcode
651	835	Image Overlap	Medium	Java	Leetcode
652	862	Shortest Subarray with Sum at Least K Monotonic Stack	Hard	Java	Leetcode
653	863	All Nodes Distance K in Binary Tree Graph	Medium	Java	Leetcode
654	823	Binary Trees With Factors Dynamic Programming	Medium	Java	Leetcode
655	868	Binary Gap	Easy	Java	Leetcode
656	865	Smallest Subtree with all the Deepest Nodes Label TreeNode Depth	Medium	Java	Leetcode
657	870	Advantage Shuffle Greedy	Medium	Java	Leetcode
658	869	Reordered Power of 2	Medium	Java	Leetcode
659	401	Binary Watch Permutation	Easy	Java	Leetcode
660	400	Nth Digit	Easy	Java	Leetcode
661	201	Bitwise AND of Numbers Range	Medium	Java	Leetcode
662	397	Integer Replacement	Medium	Java	Leetcode
663	385	Mini Parser	Medium	Java	Leetcode
664	421	Maximum XOR of Two Numbers in an Array Trie+Bit	Medium	Java	Leetcode
665	399	Evaluate Division Graph Very Good	Medium	Java	Leetcode
666	458	Poor Pigs	Easy	Java	Leetcode
667	390	Elimination Game	Medium	Java	Leetcode
668	855	Exam Room	Medium	Java	Leetcode
669	313	Super Ugly Number	Medium	Java	Leetcode
670	327	Count of Range Sum	Hard	Java	Leetcode
671	429	N-ary Tree Level Order Traversal	Easy	Java	Leetcode
672	589	N-ary Tree Preorder Traversal	Easy	Java	Leetcode
673	590	N-ary Tree Postorder Traversal	Easy	Java	Leetcode
674	430	Flatten a Multilevel Doubly Linked List DFS + LinkedList	Medium	Java	Leetcode
675	470	Implement Rand10() Using Rand7()	Medium	Java	Leetcode
676	475	Heaters Two pointers	Easy	Java	Leetcode
677	482	License Key Formatting	Easy	Java	Leetcode
678	559	Maximum Depth of N-ary Tree	Easy	Java	Leetcode
679	576	Out of Boundary Paths Very Good Dynamic Programming	Medium	Java	Leetcode
680	622	Design Circular Queue	Medium	Java	Leetcode
681	632	Smallest Range PriorityQueue like Merge K array Very Good	Hard	Java	Leetcode
682	641	Design Circular Deque	Medium	Java	Leetcode
683	655	Print Binary Tree Good DFS BFS	Medium	Java	Leetcode
684	687	Longest Univalue Path Very Good	Easy	Java	Leetcode
685	690	Employee Importance BFS DFS	Easy	Java	Leetcode
686	693	Binary Number with Alternating Bits	Easy	Java	Leetcode
687	684	Redundant Connection DFS Union Find	Medium	Java	Leetcode
688	685	Redundant Connection II DFS Union Find	Hard	Java	Leetcode
689	700	Search in a Binary Search Tree	Easy	Java	Leetcode
690	701	Insert into a Binary Search Tree	Medium	Java	Leetcode
691	703	Kth Largest Element in a Stream	Easy	Java	Leetcode
692	704	Binary Search	Easy	Java	Leetcode
693	705	Design HashSet	Easy	Java	Leetcode
694	706	Design HashMap	Easy	Java	Leetcode
695	707	Design Linked List	Easy	Java	Leetcode
696	709	To Lower Case	Easy	Java	Leetcode
697	702	Search in a Sorted Array of Unknown Size	Medium	Java	Leetcode
698	715	Range Module	Hard	Java	Leetcode
699	403	Frog Jump	Hard	Java	Leetcode
700	717	1-bit and 2-bit Characters	Easy	Java	Leetcode
701	719	Find K-th Smallest Pair Distance	Hard	Java	Leetcode
XXX	XXX	Binary Search Template
702	786	K-th Smallest Prime Fraction	Hard	Java	Leetcode
703	872	Leaf-Similar Trees	Easy	Java	Leetcode
704	668	Kth Smallest Number in Multiplication Table	Hard	Java	Leetcode
705	727	Minimum Window Subsequence Dynamic Programming Very Good	Hard	Java	Leetcode
706	115	Distinct Subsequences Dynamic Programming	Hard	Javav	Leetcode
707	876	Middle of the Linked List	Easy	Java	Leetcode
708	354	Russian Doll Envelopes LIS	Hard	Java	Leetcode
709	363	Max Sum of Rectangle No Larger Than K	Hard	Java	Leetcode
710	428	Serialize and Deserialize N-ary Tree	Hard	Java	Leetcode
711	440	K-th Smallest in Lexicographical Order	Hard	Java	Leetcode
712	472	Concatenated Words DFS Trie Dynamic Programming	Hard	Java	Leetcode
713	480	Sliding Window Median	Hard	Java	Leetcode
714	492	Construct Rectangle	Easy	Java	Leetcode
715	493	Reverse Pairs Merge Sort	Hard	Java	Leetcode
716	507	Perfect Number	Easy	Java	Leetcode
717	514	Freedom Trail Dynamic Programming	Hard	Java	Leetcode
718	551	Student Attendance Record	Easy	Java	Leetcode
719	552	Student Attendance Record II Dynamic Programming	Hard	Java	Leetcode
720	548	Split Array with Equal Sum	Medium	Java	Leetcode
721	604	Design Compressed String Iterator	Easy	Java	Leetcode
722	588	Design In-Memory File System TrieNode	Hard	Java	Leetcode
723	609	Find Duplicate File in System	Medium	Java	Leetcode
724	600	Non-negative Integers without Consecutive Ones	Hard	Java	Leetecode
725	630	Course Schedule III	Hard	Java	Leetcode
726	676	Implement Magic Dictionary	Medium	Java	Leetcode
727	679	24 Game Backtracking	Hard	Java	Leetcode
728	683	K Empty Slots Sliding Window	Hard	Java	Leetcode
729	691	Stickers to Spell Word Dynamic Programming + Backtracking	Hard	Java	Leetcode
730	884	Uncommon Words from Two Sentences	Easy	Java	Leetcode
731	716	Max Stack	Hard	Java	Leetcode
732	723	Candy Crush Two Pointers	Medium	Java	Leetcode
733	883	Projection Area of 3D Shapes	Easy	Java	Leetcode
734	726	Number of Atoms Recursion	Hard	Java	Leetcode
735	748	Shortest Completing Word	Medium	Java	Leetcode
736	888	Fair Candy Swap	Easy	Java	Leetcode
737	745	Prefix and Suffix Search	Hard	Java	Leetcode
738	753	Cracking the Safe Backtracking	Hard	Java	Leetcode
739	754	Reach a Number	Medium	Java	Leetcode
740	756	Pyramid Transition Matrix DFS + Backtracking	Medium	Java	Leetcode
741	759	Employee Free Time Merge Interval	Hard	Java	Leetcode
742	761	Special Binary String Recursion Very Good	Hard	Java	Leetcode
743	765	Couples Holding Hands Union Find	Hard	Java	Leetcode
744	773	Sliding Puzzle Backtracking BFS	Hard	Java	Leetcode
745	774	Minimize Max Distance to Gas Station Binary Search	Hard	Java	Leetcode
746	777	Swap Adjacent in LR String Very good	Medium	Java	Leetcode
747	779	K-th Symbol in Grammar Recursion	Medium	Java	Leetcode
748	781	Rabbits in Forest	Medium	Java	Leetcode
749	780	Reaching Points	Hard	Java	Leetcode
750	793	Preimage Size of Factorial Zeroes Function Binary Search	Hard	Java	Leetcode
751	798	Smallest Rotation with Highest Score	Hard	Java	Leetcode
752	809	Expressive Words	Medium	Java	Leetcode
753	810	Chalkboard XOR Game	Hard	Java	Leetcode
754	816	Ambiguous Coordinates	Medium	Java	Leetcode
755	820	Short Encoding of Words Trie	Medium	Java	Leetcode
756	831	Masking Personal Information	Medium	Java	Leetcode
757	822	Card Flipping Game	Medium	Java	Leetcode
758	893	Groups of Special-Equivalent Strings Compare two HashMap	Easy	Java	Leetcode
759	837	New 21 Game Dynamic Programming	Medium	Java	Leetcode
760	839	Similar String Groups Union Find	Hard	Java	Leetcode
761	892	Surface Area of 3D Shapes	Easy	Java	Leetcode
762	889	Construct Binary Tree from Preorder and Postorder Traversal	Medium	Java	Leetcode
763	818	Race Car	Hard	Java	Leetcode
764	847	Shortest Path Visiting All Nodes BFS Classic	Hard	Java	Leetcode
765	864	Shortest Path to Get All Keys BFS Classic	Hard	Java	Leetcode
766	896	Monotonic Array	Easy	Java	Leetcode
767	853	Car Fleet	Medium	Java	Leetcode
768	897	Increasing Order Search Tree	Easy	Java	Leetcode
769	873	Length of Longest Fibonacci Subsequence Dynamic Programming	Medium	Java	Leetcode
770	854	K-Similar Strings Classic BFS	Hard	Java	Leetcode
771	857	Minimum Cost to Hire K Workers	Hard	Java	Leetcode
772	874	Walking Robot Simulation	Easy	Java	Leetcode
773	875	Koko Eating Bananas Binary Search	Medium	Java	Leetcode
774	871	Minimum Number of Refueling Stops	Hard	Java	Leetcode
775	877	Stone Game	Medium	Java	Leetcode
776	878	Nth Magical Number	Hard	Java	Leetcode
777	880	Decoded String at Index	Medium	Java	Leetcode
778	881	Boats to Save People	Medium	Java	Leetcode
779	905	Sort Array By Parity	Easy	Java	Leetcode
780	890	Find and Replace Pattern	Medium	Java	Leetcode
781	886	Possible Bipartition DFS Color	Medium	Java	Leetcode
782	879	Profitable Schemes	Hard	Java	Leetcode
783	894	All Possible Full Binary Trees Recursion	Medium	Java	Leetcode
784	895	Maximum Frequency Stack Very Good LFU	Hard	Java	Leetcode
785	898	Bitwise ORs of Subarrays	Medium	Java	Leetcode
786	904	Fruit Into Baskets Sliding Window	Medium	Java	Leetcode
787	885	Spiral Matrix III	Medium	Java	Leetcode
788	887	Super Egg Drop	Hard	Java	Leetcode
789	900	RLE Iterator	Medium	Java	Leetcode
790	891	Sum of Subsequence Widths	Hard	Java	Leetcode
791	901	Online Stock Span Monotonic Stack	Medium	Java	Leetcode
792	899	Orderly Queue	Hard	Java	Leetcode
793	903	Valid Permutations for DI Sequence Dynamic Programming	Hard	Java	Leetcode
794	908	Smallest Range I	Easy	Java	Leetcode
795	910	Smallest Range II	Medium	Java	Leetcode
796	911	Online Election	Medium	Java	Leetcode
797	907	Sum of Subarray Minimums Dynamic Programming + Monotonic Stack	Hard	Java	Leetcode
798	65	Valid Number	Hard	Java	Leetcode
799	37	Sudoku Solver Backtracking	Hard	Java	Leetcode
800	126	Word ladder II	Hard	Java	Leetcode
801	163	Missing Ranges	Medium	Java	Leetcode
802	286	Walls and Gates	Medium	Java	Leetcode
803	288	Unique Word Abbreviation	Medium	Java	Leetcode
804	291	Word Pattern II Backtracking	Hard	Java	Leetcode
805	353	Design Snake Game	Medium	Java	Leetcode
806	361	Bomb Enemy	Medium	Java	Leetcode
807	379	Design Phone Directory	Medium	Java	Leetcode
808	302	Smallest Rectangle Enclosing Black Pixels Binary Search	Hard	Java	Leetcode
809	487	Max Consecutive Ones II	Medium	Java	Leetcode
810	471	Encode String with Shortest Length 2D Dynamic Programming	Hard	Java	Leetcode
811	465	Optimal Account Setting	Hard	Java	Leetcode
812	489	Robot clean room	Hard	Java	Leetcode
813	555	Split Concatenated Strings	Medium	Java	Leetcode
814	157	Read N Characters Given Read4	Easy	Java	Leetcode
815	666	Path Sum IV	Medium	Java	Leetcode
816	755	Pour Water Two points	Medium	Java	Leetcode
817	656	Coin Path	Hard	Java	Leetcode
818	317	Shortest Distance from All Buildings BFS	Hard	Java	Leetcode
819	358	Rearrange String k Distance Apart	Hard	Java	Leetcode
820	634	Find the Derangement of An Array	Medium	Java	Leetcode
821	356	Line Reflection	Medium	Java	Leetcode
822	625	Minimum Factorization	Medium	Java	Leetcode
823	444	Sequence Reconstruction BFS Topological	Medium	Java	Leetcode
824	660	Remove 9 Convert 10-based to x-based	Hard	Java	Leetcode
825	568	Maximum Vacation Days Dynamic Programming	Hard	Java	Leetcode
826	914	X of a Kind in a Deck of Cards gcd	Easy	Java	Leetcode
827	915	Partition Array into Disjoint Intervals Good	Medium	Java	Leetcode
828	917	Reverse Only Letters	Easy	Java	Leetcode
829	916	Word Subsets	Medium	Java	Leetcode
830	918	Maximum Sum Circular Subarray Very Good	Medium	Java	Leetcode
831	919	Complete Binary Tree Inserter	Medium	Java	Leetcode
832	920	Number of Music Playlists Dynamic Programming	Hard	Java	Leetcode
833	922	Sort Array By Parity II	Easy	Java	Leetcode
834	921	Minimum Add to Make Parentheses Valid	Medium	Java	Leetcode
835	923	3Sum With Multiplicity Very Good	Medium	Java	Leetcode
836	924	Minimize Malware Spread Union Find	Hard	Java	Leetcode
837	200	Number of islands	Medium	Java	Leetcode
838	925	Long Pressed Name	Easy	Java	Leetcode
839	926	Flip String to Monotone Increasing	Medium	Java	Leetcode
840	927	Three Equal Parts	Hard	Java	Leetcode
841	928	Minimize Malware Spread II Union Find	Hard	Java	Leetcode
842	929	Unique Email Addresses	Easy	Java	Leetcode
843	930	Binary Subarrays With Sum Prefix Very Good	Medium	Java	Leetcode
844	931	Minimum Falling Path Sum	Medium	Java	Leetcode
XXX	XXX	Trie Template
845	933	Number of Recent Calls Treemap	Easy	Java	Leetcode
846	934	Shortest Bridge BFS	Medium	Java	Leetcode
847	935	Knight Dialer	Medium	Java	Leetcode
848	427	Construct Quad Tree Recursion	Medium	Java	Leetcode
849	938	Range Sum of BST	Medium	Java	Leetcode
850	937	Reorder log files	Easy	Java	Leetcode
851	940	Distinct Subsequences II Dynamic Very Good	Hard	Java	Leetcode
852	939	Minimum Area Rectangle	Medium	Java	Leetcode
853	29	Divide Two Integers	Medium	Java	Leetcode
854	941	Valid Mountain Array Good Two Pointers	Easy	Java	Leetcode
855	942	DI String Match Two Pointers	Easy	Java	Leetcode
856	944	Delete Columns to Make Sorted	Medium	Java	Leetcode
857	34	Find First and Last Position of Element in Sorted Array	Medium	Java	Leetcode
858	945	Minimum Increment to Make Array Unique Good	Medium	Java	Leetcode
859	946	Validate Stack Sequences Stack Good	Medium	Java	Leetcode
860	948	Bag of Tokens	Medium	Java	Leetcode
861	947	Most Stones Removed with Same Row or Column Union Find Good	Medium	Java	Leetcode
862	74	Search a 2D Matrix Good	Medium	Java	Leetcode
863	722	Remove Comments	Medium	Java	Leetcode
864	949	Largest Time for Given Digits Permutation	Easy	Java	Leetcode
865	951	Flip Equivalent Binary Trees Good	Medium	Java	Leetcode
866	950	Reveal Cards In Increasing Order Very Good	Medium	Java	Leetcode
867	952	Largest Component Size by Common Factor Union Find Very Good	Hard	Java	Leetcode
868	232	Implement queue using stacks	Easy	Java	Leetcode
869	953	Verifying an Alien Dictionary	Easy	Java	Leetcode
870	954	Array of Doubled Pairs	Medium	Java	Leetcode
871	955	Delete Columns to Make Sorted II Greedy	Medium	Java	Leetcode
872	794	Valid Tic-Tac-Toe State	Medium	Java	Leetcode
873	956	Tallest Billboard Dynamic Programming HashMap	Hard	Java	Leetcode
874	957	Prison Cells After N Days HashSet	Medium	Java	Leetcode
875	958	Check Completeness of a Binary Tree Good	Medium	Java	Leetcode
876	959	Regions Cut By Slashes Very Good	Medium	Java	Leetcode
877	960	Delete Columns to Make Sorted III Longest Increasing Subsequence Very Good	Hard	Java	Leetcode
878	132	Palindrome Partitioning II	Hard	Java	Leetcode
879	961	N-Repeated Element in Size 2N Array	Easy	Java	Leetcode
880	962	Maximum Width Ramp Monotonic Stack Very Good	Medium	Java	Leetcode
881	963	Minimum Area Rectangle II	Medium	Java	Leetcode
882	964	Least Operators to Express Number DFS + memo	Hard	Java	Leetcode
883	674	Longest Continuous Increasing Subsequence	Easy	Java	Leetcode
884	68	Text Justification	Hard	Java	Leetcode
885	965	Univalued Binary Tree	Easy	Java	Leetcode
886	966	Vowel Spellchecker Good	Medium	Java	Leetcode