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

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Java Solutions to problems on LintCode/LeetCode

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