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

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Java Solutions to problems on LintCode/LeetCode

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