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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(wangdeve@gmail.com), 或者在GitHub上发issue给我.

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

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