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

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Java Solutions to problems on LintCode/LeetCode

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