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

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