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

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Java Solutions to problems on LintCode/LeetCode

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