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

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