Java Algorithm Problems

程序员的一天

从开始这个Github已经有将近两年时间, 很高兴这个repo可以帮到有需要的人. 我一直认为, 知识本身是无价的, 因此每逢闲暇, 我就会来维护这个repo, 给刷题的朋友们一些我的想法和见解. 下面来简单介绍一下这个repo:

README.md: 所有所做过的题目

ReviewPage.md: 所有题目的总结和归纳（不断完善中）

KnowledgeHash2.md: 对所做过的知识点的一些笔记

SystemDesign.md: 对系统设计的一些笔记

Future Milestone: 我准备将一些有意思的题目，做成视频的形式给大家参考

希望大家学习顺利, 对未来充满希望(程序员也是找到好老板的!) 有问题可以给我写邮件([email protected]), 或者在GitHub上发issue给我.

Squence	Problem	Level	Language	Tags	Video Tutorial
0	Alien Dictionary.java	Hard	Java	[]
1	Anagrams.java	Medium	Java	[]
2	Binary Representation.java	Hard	Java	[]
3	Binary Tree Level Order Traversal II.java	Medium	Java	[]
4	Binary Tree Level Order Traversal.java	Medium	Java	[]
5	Binary Tree Longest Consecutive Sequence.java	Medium	Java	[]
6	Binary Tree Maximum Path Sum II.java	Medium	Java	[]
7	Binary Tree Preorder Traversal.java	Easy	Java	[]
8	Binary Tree Right Side View.java	Medium	Java	[]
9	Binary Tree Serialization.java	Medium	Java	[]
10	Binary Tree Zigzag Level Order Traversal.java	Medium	Java	[]
11	Closest Number in Sorted Array.java	Easy	Java	[]
12	ColorGrid.java	Medium	Java	[]
13	Combination Sum II.java	Medium	Java	[]
14	Combination Sum.java	Medium	Java	[]
15	Combinations.java	Medium	Java	[]
16	Compare Strings.java	Easy	Java	[]
17	Complete Binary Tree.java	Easy	Java	[]
18	Construct Binary Tree from Inorder and Postorder Traversal.java	Medium	Java	[]
19	Container With Most Water.java	Medium	Java	[]
20	Contains Duplicate II.java	Easy	Java	[]
21	Contains Duplicate III.java	Medium	Java	[]
22	Contains Duplicate.java	Easy	Java	[]
23	Convert Binary Search Tree to Doubly Linked List.java	Medium	Java	[]
24	Convert Expression to Polish Notation.java	Hard	Java	[]
25	Convert Expression to Reverse Polish Notation.java	Hard	Java	[]
26	Convert Integer A to Integer B.java	Easy	Java	[]
27	Copy List with Random Pointer.java	Medium	Java	[]
28	Cosine Similarity.java	Easy	Java	[]
29	Count 1 in Binary.java	Easy	Java	[]
30	Count and Say.java	Easy	Java	[]
31	Count of Smaller Number before itself.java	Hard	Java	[]
32	Count of Smaller Number.java	Medium	Java	[]
33	Count Primes.java	Easy	Java	[]
34	Course Schedule II.java	Medium	Java	[]
35	Course Schedule.java	Medium	Java	[]
36	Delete Digits.java	Medium	Java	[]
37	Delete Node in the Middle of Singly Linked List.java	Easy	Java	[]
38	Encode and Decode Strings.java	Medium	Java	[]
39	ExcelSheetColumnNumber .java	Easy	Java	[]
40	Expression Evaluation.java	Hard	Java	[]
41	Expression Tree Build.java	Hard	Java	[]
42	Fast Power.java	Medium	Java	[]
43	Fibonacci.java	Easy	Java	[]
44	Find the Connected Component in the Undirected Graph.java	Medium	Java	[]
45	Find the Weak Connected Component in the Directed Graph.java	Medium	Java	[]
46	First Missing Positive.java	N/A	Java	[]
47	Flatten 2D Vector.java	Medium	Java	[]
48	Flip Game II.java	Medium	Java	[]
49	Flip Game.java	Easy	Java	[]
50	Fraction to Recurring Decimal.java	Medium	Java	[]
51	Gas Station.java	N/A	Java	[]
52	Generate Parentheses.java	Medium	Java	[]
53	Gray Code.java	Medium	Java	[]
54	Group Anagrams.java	Medium	Java	[]
55	Group Shifted Strings.java	Easy	Java	[]
56	H-Index II.java	Medium	Java	[]
57	H-Index.java	Medium	Java	[]
58	Hamming Distance.java	Easy	Java	[]
59	Happy Number.java	Easy	Java	[]
60	Hash Function.java	Easy	Java	[]
61	HashHeap.java	Hard	Java	[]
62	HashWithArray.java	Easy	Java	[]
63	HashWithCustomizedClass(LinkedList).java	Medium	Java	[]
64	Heapify.java	Medium	Java	[]
65	Heaters.java	Easy	Java	[]
66	Identical Binary Tree.java	Easy	Java	[]
67	Implement Queue by Two Stacks.java	N/A	Java	[]
68	Implement Stack by Two Queues.java	Easy	Java	[]
69	Implement Stack using Queues.java	Easy	Java	[]
70	Implement Stack.java	Easy	Java	[]
71	Implement strStr().java	N/A	Java	[]
72	Implement Trie (Prefix Tree).java	Medium	Java	[]
73	IndexMatch.java	Easy	Java	[]
74	Inorder Successor in Binary Search Tree.java	Medium	Java	[]
75	Insert Interval.java	Easy	Java	[]
76	Insert Node in a Binary Search Tree .java	Easy	Java	[]
77	Insertion Sort List.java	N/A	Java	[]
78	Integer to English Words.java	N/A	Java	[]
79	Interleaving Positive and Negative Numbers.java	N/A	Java	[]
80	Intersection of Two Arrays.java	Easy	Java	[]
81	Intersection of Two Linked Lists.java	Easy	Java	[]
82	Interval Minimum Number.java	Medium	Java	[]
83	Interval Sum II.java	Hard	Java	[]
84	Interval Sum.java	Medium	Java	[]
85	Invert Binary Tree.java	Easy	Java	[]
86	Isomorphic Strings.java	Easy	Java	[]
87	Jump Game II.java	Hard	Java	[]
88	Kth Largest Element.java	Medium	Java	[]
89	Kth Smallest Element in a BST.java	N/A	Java	[]
90	Kth Smallest Sum In Two Sorted Arrays.java	Hard	Java	[]
91	Largest Number.java	N/A	Java	[]
92	Last Position of Target.java	N/A	Java	[]
93	Length of Last Word.java	N/A	Java	[]
94	Longest Common Prefix.java	Medium	Java	[]
95	Longest Common Substring.java	N/A	Java	[]
96	Longest Consecutive Sequence.java	N/A	Java	[]
97	Longest Increasing Continuous subsequence II.java	N/A	Java	[]
98	Longest Increasing Continuous subsequence.java	Easy	Java	[]
99	Longest Palindromic Substring.java	Medium	Java	[]
100	Longest Univalue Path.java	Easy	Java	[]
101	Longest Word in Dictionary.java	Easy	Java	[]
102	Longest Words.java	N/A	Java	[]
103	Lowest Common Ancestor II.java	Easy	Java	[]
104	Lowest Common Ancestor of a Binary Search Tree.java	Medium	Java	[]
105	Lowest Common Ancestor.java	Easy	Java	[]
106	LRU Cache.java	Hard	Java	[]
107	Majority Number II.java	Medium	Java	[]
108	Majority Number III.java	Medium	Java	[]
109	Matrix Zigzag Traversal.java	Easy	Java	[]
110	Max Area of Island.java	Easy	Java	[]
111	Maximum Depth of Binary Tree.java	Easy	Java	[]
112	Maximum Subarray III.java	N/A	Java	[]
113	Maximum Subarray.java	Easy	Java	[]
114	Maximum SubarrayII.java	N/A	Java	[]
115	MaximumSubarrayII.java	N/A	Java	[]
116	Median of two Sorted Arrays.java	Hard	Java	[]
117	Median.java	N/A	Java	[]
118	Merge Intervals.java	Easy	Java	[]
119	Merge k Sorted Arrays.java	Medium	Java	[]
120	Merge k Sorted Lists.java	Medium	Java	[]
121	Merge Sorted Array II.java	N/A	Java	[]
122	Merge Sorted Array.java	Easy	Java	[]
123	Merge Two Binary Trees.java	Easy	Java	[]
124	Merge Two Sorted Lists.java	Easy	Java	[]
125	Middle of Linked List.java	N/A	Java	[]
126	Minimum Absolute Difference in BST.java	Easy	Java	[]
127	Minimum Height Trees.java	N/A	Java	[]
128	Minimum Subarray.java	N/A	Java	[]
129	MinimumDepthOfBinaryTree.java	Easy	Java	[]
130	Missing Ranges.java	N/A	Java	[]
131	Multiply Strings.java	Medium	Java	[]
132	Next Permutation.java	Medium	Java	[]
133	Nim Game.java	Easy	Java	[]
134	NQueens.java	N/A	Java	[]
135	NQueensII.java	N/A	Java	[]
136	Nth to Last Node in List.java	N/A	Java	[]
137	Number Triangles.java	N/A	Java	[]
138	O(1) Check Power of 2.java	N/A	Java	[]
139	One Edit Distance.java	Medium	Java	[]
140	Paint Fence.java	N/A	Java	[]
141	Palindrome Linked List.java	N/A	Java	[]
142	Palindrome Partitioning.java	N/A	Java	[]
143	Palindrome Permutation II.java	Medium	Java	[]
144	Palindrome Permutation.java	Easy	Java	[]
145	Partition Array by Odd and Even.java	N/A	Java	[]
146	Partition Array.java	N/A	Java	[]
147	Partition List.java	N/A	Java	[]
148	Pascal's Triangle II.java	Easy	Java	[]
149	Peeking Iterator.java	N/A	Java	[]
150	Permutation Index.java	Easy	Java	[]
151	Permutation Sequence.java	Medium	Java	[]
152	Permutations II.java	Medium	Java	[]
153	Permutations.java	Medium	Java	[]
154	Populating Next Right Pointers in Each Node II.java	Hard	Java	[]
155	Product of Array Exclude Itself.java	N/A	Java	[]
156	QuickSort.java	Easy	Java	[]
157	Recover Rotated Sorted Array.java	N/A	Java	[]
158	Rehashing.java	Medium	Java	[]
159	Remove Duplicates from Sorted Array.java	Easy	Java	[]
160	Remove Duplicates from Sorted List II.java	N/A	Java	[]
161	Remove Duplicates from Sorted List.java	Easy	Java	[]
162	Remove Duplicates from Unsorted List.java	N/A	Java	[]
163	Remove Invalid Parentheses.java	Hard	Java	[]
164	Remove Linked List Elements.java	N/A	Java	[]
165	Remove Node in Binary Search Tree.java	Hard	Java	[]
166	Reorder List.java	N/A	Java	[]
167	Reshape the Matrix.java	Easy	Java	[]
168	Restore IP Addresses.java	N/A	Java	[]
169	Reverse Linked List II .java	N/A	Java	[]
170	Reverse Linked List.java	Easy	Java	[]
171	Reverse String.java	Easy	Java	[]
172	Reverse Words in a String II.java	Medium	Java	[]
173	Reverse Words in a String.java	Medium	Java	[]
174	Roman to Integer.java	Easy	Java	[]
175	Rotate Image.java	Medium	Java	[]
176	Rotate List.java	N/A	Java	[]
177	Rotate String.java	N/A	Java	[]
178	Russian Doll Envelopes.java	N/A	Java	[]
179	Search a 2D Matrix II.java	N/A	Java	[]
180	Search a 2D Matrix.java	N/A	Java	[]
181	Search for a Range.java	N/A	Java	[]
182	Search Insert Position.java	N/A	Java	[]
183	Search Range in Binary Search Tree .java	Medium	Java	[]
184	Search Rotated in Sorted Array II.java	N/A	Java	[]
185	Search Rotated in Sorted Array.java	Hard	Java	[]
186	Segment Tree Build II.java	Medium	Java	[]
187	Segment Tree Build.java	Medium	Java	[]
188	Segment Tree Modify.java	Medium	Java	[]
189	Segment Tree Query II.java	Medium	Java	[]
190	Segment Tree Query.java	Medium	Java	[]
191	Serilization and Deserialization Of Binary Tree.java	N/A	Java	[]
192	Shortest Word Distance.java	Easy	Java	[]
193	Single Number II.java	N/A	Java	[]
194	Single Number III.java	N/A	Java	[]
195	Single Number.java	Easy	Java	[]
196	Singleton.java	N/A	Java	[]
197	Sliding Window Maximum.java	N/A	Java	[]
198	Sort Color.java	N/A	Java	[]
199	Sort Colors II.java	N/A	Java	[]
200	Sort Letters by Case.java	N/A	Java	[]
201	Sort List.java	N/A	Java	[]
202	Space Replacement.java	N/A	Java	[]
203	Stone Game.java	N/A	Java	[]
204	String Permutation.java	Easy	Java	[]
205	String to Integer(atoi).java	Easy	Java	[]
206	Strobogrammatic Number II.java	Medium	Java	[]
207	Strobogrammatic Number.java	Easy	Java	[]
208	StrStr.java	N/A	Java	[]
209	Subarray Sum Closest.java	Medium	Java	[]
210	Subarray Sum.java	Easy	Java	[]
211	Subset.java	Medium	Java	[]
212	Subsets II.java	Medium	Java	[]
213	Subtree.java	Easy	Java	[]
214	Summary Ranges.java	N/A	Java	[]
215	Symmetric Binary Tree.java	Easy	Java	[]
216	The Smallest Difference.java	N/A	Java	[]
217	Top K Frequent Elements.java	Medium	Java	[]
218	Top K Frequent Words.java	Medium	Java	[]
219	Topological Sorting.java	Medium	Java	[]
220	Total Occurrence of Target.java	N/A	Java	[]
221	Trailing Zeros.java	N/A	Java	[]
222	Tweaked Identical Binary Tree.java	Easy	Java	[]
223	Two Lists Sum.java	N/A	Java	[]
224	Two Strings Are Anagrams.java	Easy	Java	[]
225	Ugly Number II.java	N/A	Java	[]
226	Ugly Number.java	Medium	Java	[]
227	Unique Binary Search Tree II.java	N/A	Java	[]
228	Unique Characters.java	N/A	Java	[]
229	Unique Word Abbreviation.java	N/A	Java	[]
230	Valid Palindrome.java	Easy	Java	[]
231	Valid Parentheses.java	Easy	Java	[]
232	Valid Sudoku.java	Easy	Java	[]
233	Word Break.java	Medium	Java	[]
234	Word Ladder II.java	Hard	Java	[]
235	Word Ladder.java	Medium	Java	[]
236	Word Pattern.java	Easy	Java	[]
237	Zigzag Iterator.java	N/A	Java	[]
238	Find Anagram Mappings.java	Easy	Java	[Hash Table]
239	Judge Route Circle.java	Easy	Java	[String]
240	Island Perimeter.java	Easy	Java	[Hash Table]
241	First Unique Character in a String.java	Easy	Java	[Hash Table, String]
242	Power of Three.java	Easy	Java	[Math]
243	Plus One.java	Easy	Java	[Array, Math]
244	Power of Two.java	Easy	Java	[Bit Manipulation, Math]
245	Reverse Vowels of a String.java	Easy	Java	[String, Two Pointers]
246	Guess Number Higher or Lower.java	Easy	Java	[Binary Search]
247	Encode and Decode TinyURL.java	Medium	Java	[Hash Table, Math]
248	Wiggle Sort.java	Medium	Java	[Array, Sort]
249	Queue Reconstruction by Height.java	Medium	Java	[Greedy]
250	2 Sum.java	Easy	Java	[Array, Hash Table]
251	2 Sum II - Input array is sorted.java	Medium	Java	[Array, Binary Search, Two Pointers]
252	2 Sum II.java	Medium	Java	[Array, Binary Search, Two Pointers]
253	Coin Change.java	Medium	Java	[DP]
254	Jump Game.java	Medium	Java	[Array, Greedy]
255	Maximum Product Subarray.java	Medium	Java	[Array, DP]
256	3 Sum Closest.java	Medium	Java	[Array, Two Pointers]
257	Triangle Count.java	Medium	Java	[Array]
258	3 Sum.java	Medium	Java	[Array, Two Pointers]
259	4 Sum.java	Medium	Java	[Hash Table]
260	k Sum.java	Hard	Java	[DP]
261	Longest Continuous Increasing Subsequence.java	Easy	Java	[Array, DP]
262	Longest Increasing Subsequence.java	Medium	Java	[Binary Search, DP, Memoization, Sequence DP]
263	Unique Binary Search Tree.java	Medium	Java	[DP, Tree]
264	Trim a Binary Search Tree.java	Easy	Java	[Tree]
265	Unique Paths II.java	Medium	Java	[Array, DP]
266	Counting Bits.java	Medium	Java	[Bit Manipulation, DP]
267	Bomb Enemy.java	Medium	Java	[DP]
268	Paint House.java	Easy	Java	[DP]
269	Decode Ways.java	Review	Java	[DP, String]
270	House Robber.java	Easy	Java	[DP, Sequence DP]
271	House Robber II.java	Medium	Java	[DP, Sequence DP]
272	Best Time to Buy and Sell Stock I.java	Easy	Java	[Array, DP]
273	Best Time to Buy and Sell Stock II.java	Easy	Java	[Array, Greedy]
274	Best Time to Buy and Sell Stock III .java	Hard	Java	[Array, DP]
275	Best Time to Buy and Sell Stock IV.java	Hard	Java	[DP]
276	Paint House II.java	Review	Java	[DP]
277	3 Sum Smaller.java	Medium	Java	[Array, Two Pointers]
278	Array Partition I.java	Easy	Java	[Array]
279	1-bit and 2-bit Characters.java	Easy	Java	[Array]
280	Non-decreasing Array.java	Easy	Java	[Array]
281	Max Consecutive Ones.java	Easy	Java	[Array]
282	Find All Numbers Disappeared in an Array.java	Easy	Java	[Array]
283	Maximum Average Subarray I.java	Easy	Java	[Array]
284	Largest Number At Least Twice of Others.java	Easy	Java	[Array]
285	Toeplitz Matrix.java	Easy	Java	[Array]
286	Backpack.java	Medium	Java	[DP]
287	Sum of Two Integers.java	Easy	Java	[Bit Manipulation]
288	Swap Bits.java	Easy	Java	[Bit Manipulation]
289	Update Bits.java	Medium	Java	[Bit Manipulation]
290	Maximum XOR of Two Numbers in an Array.java	Medium	Java	[Bit Manipulation, Trie]
291	Perfect Squares.java	Medium	Java	[BFS, DP, Math]
292	Palindrome Partitioning II.java	Hard	Java	[DP]
293	Backpack V.java	Medium	Java	[DP]
294	Backpack VI.java	Medium	Java	[DP]
295	Copy Books.java	Hard	Java	[Binary Search, DP]
296	Valid Perfect Square.java	Review	Java	[Binary Search, Math]
297	Intersection of Two Arrays II.java	Easy	Java	[Binary Search, Hash Table, Sort, Two Pointers]
298	Backpack II.java	Medium	Java	[DP]
299	Backpack III.java	Review	Java	[DP]
300	Longest Palindromic Subsequence.java	Medium	Java	[DP]
301	Burst Balloons.java	Hard	Java	[DP, Divide and Conquer]
302	Scramble String.java	Hard	Java	[DP, String]
303	Binary Search Tree Iterator.java	Medium	Java	[Design, Stack, Tree]
304	Flatten Nested List Iterator.java	Medium	Java	[Design, Stack]
305	Best Time to Buy and Sell Stock with Cooldown.java	Medium	Java	[DP]
306	Find Peak Element.java	Medium	Java	[Array, Binary Search]
307	Longest Common Subsequence.java	Medium	Java	[DP]
308	Interleaving String.java	Hard	Java	[DP, String]
309	Letter Combinations of a Phone Number.java	Medium	Java	[Backtracking, String]
310	Edit Distance.java	Hard	Java	[DP, String]
311	Distinct Subsequences.java	Hard	Java	[DP, String]
312	Regular Expression Matching.java	Review	Java	[Backtracking, DP, String]
313	Majority Element.java	Easy	Java	[Array, Bit Manipulation, Divide and Conquer]
314	Wildcard Matching.java	Hard	Java	[Backtracking, DP, Greedy, String]
315	Ones and Zeroes.java	Hard	Java	[DP]
316	Pow(x,n).java	Medium	Java	[Binary Search, Math]
317	Word Break II.java	Review	Java	[Backtracking, DP]
318	Nested List Weight Sum.java	Easy	Java	[DFS]
319	Same Tree.java	Easy	Java	[DFS, Tree]
320	Convert Sorted Array to Binary Search Tree.java	Easy	Java	[DFS, Tree]
321	Binary Tree Maximum Path Sum.java	Review	Java	[DFS, Tree]
322	Construct Binary Tree from Inorder and Preorder Traversal.java	Medium	Java	[Array, DFS, Tree]
323	Path Sum.java	Easy	Java	[DFS, Tree]
324	Add Binary.java	Easy	Java	[Math, String]
325	Add Digits.java	Easy	Java	[Math]
326	Add Two Numbers.java	Medium	Java	[Linked List, Math]
327	Add Two Numbers II.java	Medium	Java	[Linked List]
328	Balanced Binary Tree.java	Medium	Java	[DFS, Tree]
329	Valid Anagram.java	Easy	Java	[Hash Table, Sort]
330	Populating Next Right Pointers in Each Node.java	Medium	Java	[DFS, Tree]
331	Validate Binary Search Tree.java	Medium	Java	[DFS, Tree]
332	Convert Sorted List to Binary Search Tree.java	Medium	Java	[DFS, Linked List]
333	Flatten Binary Tree to Linked List.java	Medium	Java	[Binary Tree, DFS]
334	Binary Tree Paths.java	Easy	Java	[Binary Tree, DFS]
335	Minimum Size Subarray Sum.java	Medium	Java	[Array, Binary Search, Two Pointers]
336	Clone Graph.java	Medium	Java	[BFS, DFS, Graph]
337	Longest Substring Without Repeating Characters.java	Medium	Java	[Hash Table, String, Two Pointers]
338	Minimum Window Substring.java	Hard	Java	[Hash Table, String, Two Pointers]
339	Linked List Cycle.java	Easy	Java	[Linked List, Two Pointers]
340	Remove Nth Node From End of List.java	Medium	Java	[Linked List, Two Pointers]
341	Longest Substring with At Most K Distinct Characters.java	Medium	Java	[Hash Table, String]
342	Linked List Cycle II.java	Medium	Java	[Linked List, Two Pointers]
343	Kth Smallest Number in Sorted Matrix.java	Medium	Java	[Binary Search, Heap]
344	Find Minimum in Rotated Sorted Array.java	Medium	Java	[Array, Binary Search]
345	Find Minimum in Rotated Sorted Array II.java	Hard	Java	[Array, Binary Search]
346	Connecting Graph.java	Medium	Java	[Union Find]
347	Connecting Graph II.java	Medium	Java	[Union Find]
348	Connecting Graph III.java	Medium	Java	[Union Find]
349	Number of Islands.java	Medium	Java	[BFS, DFS, Union Find]
350	Number of Islands II.java	Hard	Java	[Union Find]
351	Graph Valid Tree.java	Medium	Java	[BFS, DFS, Graph, Union Find]
352	Surrounded Regions.java	Review	Java	[BFS, DFS, Union Find]
353	Implement Trie.java	Medium	Java	[Design, Trie]
354	Add and Search Word.java	Medium	Java	[Backtracking, Design, Trie]
355	Word Search II.java	Hard	Java	[Backtracking, DFS, Trie]
356	Word Search.java	Medium	Java	[Array, Backtracking]
357	Word Squares.java	Hard	Java	[Backtracking, Trie]
358	Trapping Rain Water.java	Hard	Java	[Array, Stack, Two Pointers]
359	Trapping Rain Water II.java	Hard	Java	[BFS, Heap]
360	Data Stream Median.java	Hard	Java	[Design, Heap]
361	Sliding Window Median.java	Hard	Java	[Design, Heap]
362	Min Stack.java	Easy	Java	[Design, Stack]
363	Implement Queue using Stacks.java	Easy	Java	[Design, Stack]
364	Expression Expand.java	Medium	Java	[DFS, Divide and Conquer, Stack]
365	Largest Rectangle in Histogram.java	Hard	Java	[Array, Stack]
366	Max Tree.java	Medium	Java	[Stack, Tree]
367	Reverse Integer.java	Easy	Java	[Math]
368	Swap Nodes in Pairs.java	Medium	Java	[Linked List]
369	Find Peak Element II.java	Hard	Java	[Binary Search, DFS, Divide and Conquer]
370	Sqrt(x).java	Easy	Java	[Binary Search, Math]
371	First Bad Version.java	Easy	Java	[Binary Search]
372	Wood Cut.java	Medium	Java	[Binary Search]
373	Find the Duplicate Number.java	Medium	Java	[Array, Binary Search, Two Pointers]
374	Palindrome Pairs.java	Hard	Java	[Hash Table, String, Trie]
375	Game of Life.java	Medium	Java	[Array]
376	Maximum Average Subarray II.java	Review	Java	[Array, Binary Search]
377	Meeting Rooms.java	Easy	Java	[Sort, Sweep Line]
378	Number of Airplane in the sky.java	Medium	Java	[Array, Interval, Sort, Sweep Line]
379	Meeting Rooms II.java	Medium	Java	[Greedy, Heap, Sort, Sweep Line]
380	Building Outline.java	Review	Java	[Binary Indexed Tree, Divide and Conquer, Heap, Segment Tree, Sweep Line]
381	Unique Path.java	Medium	Java	[Array, Coordinate DP, DP]
382	Maximal Rectangle.java	Hard	Java	[Array, DP, Hash Table, Stack]
383	Maximal Square.java	Medium	Java	[Coordinate DP, DP]
384	Minimum Path Sum.java	Medium	Java	[Array, Coordinate DP, DP]
385	House Robber III.java	Hard	Java	[DFS, DP, Status DP, Tree]
386	Longest Increasing Path in a Matrix.java	Hard	Java	[DFS, DP, Memoization, Topological Sort]
387	Coins in a Line.java	Medium	Java	[DP, Game Theory, Greedy]
388	Coins in a Line II.java	Medium	Java	[Array, DP, Game Theory, Memoization, MiniMax]
389	Binary Tree Inorder Traversal.java	Easy	Java	[Hash Table, Stack, Tree]
390	Path Sum II.java	Easy	Java	[DFS, Tree]
391	Binary Tree Postorder Traversal.java	Medium	Java	[Stack, Tree, Two Stacks]
392	Change to Anagram.java	Easy	Java	[String]
393	Classical Binary Search.java	Easy	Java	[Binary Search]
394	Climbing Stairs.java	Easy	Java	[DP, Memoization, Sequence DP]
395	Coins in a Line III.java	Hard	Java	[Array, DP, Game Theory, Interval DP, Memoization]
396	Closest Binary Search Tree Value.java	Easy	Java	[Binary Search, Tree]
397	Compare Version Numbers.java	Medium	Java	[String]
398	Count Complete Tree Nodes.java	Medium	Java	[Binary Search, Tree]