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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 Count of Smaller Number before itself.java Hard Java []
1 Delete Digits.java Medium Java []
2 Flatten 2D Vector.java Medium Java [Design]
3 Fraction to Recurring Decimal.java Medium Java [Hash Table, Math]
4 Gray Code.java Medium Java [Backtracking]
5 Group Shifted Strings.java Easy Java []
6 Hamming Distance.java Easy Java []
7 Happy Number.java Easy Java []
8 HashWithArray.java Easy Java []
9 Heaters.java Easy Java []
10 IndexMatch.java Easy Java []
11 Insert Node in a Binary Search Tree .java Easy Java [BST]
12 Isomorphic Strings.java Easy Java []
13 Jewels and Stones.java Easy Java [Hash Table]
14 Kth Smallest Sum In Two Sorted Arrays.java Hard Java []
15 LFU Cache.java Hard Java [Design, Hash Table]
16 Longest Univalue Path.java Easy Java []
17 Majority Number II.java Medium Java [Enumeration, Greedy]
18 Majority Number III.java Medium Java [Hash Table, Linked List]
19 Matrix Zigzag Traversal.java Easy Java []
20 Maximum Subarray III.java Review Java []
21 Minimum Absolute Difference in BST.java Easy Java [BST]
22 Minimum Height Trees.java Medium Java [BFS, Graph]
23 Missing Ranges.java Medium Java [Array]
24 Next Permutation.java Medium Java [Array]
25 O(1) Check Power of 2.java Easy Java [Bit Manipulation]
26 Palindrome Permutation II.java Medium Java [Backtracking, Permutation]
27 Partition Array by Odd and Even.java Easy Java [Array, Two Pointers]
28 Pascal's Triangle II.java Easy Java []
29 Permutation Index.java Easy Java []
30 Permutation Sequence.java Medium Java [Backtracking, Math]
31 Prefix and Suffix Search.java Hard Java [Trie]
32 Product of Array Exclude Itself.java Medium Java [Array]
33 Recover Rotated Sorted Array.java Easy Java [Array]
34 Remove Duplicates from Unsorted List.java Medium Java [Linked List]
35 Remove Node in Binary Search Tree.java Hard Java [BST]
36 Reshape the Matrix.java Easy Java []
37 Reverse String.java Easy Java []
38 Rotate Image.java Medium Java [Array, Enumeration]
39 Search in Rotated Sorted Array II.java Medium Java [Array, Binary Search]
40 Search Insert Position.java Easy Java []
41 Shortest Word Distance.java Easy Java []
42 Single Number II.java Medium Java [Bit Manipulation]
43 Single Number III.java Medium Java [Bit Manipulation]
44 Single Number.java Easy Java []
45 Sliding Window Maximum.java Hard Java [Sliding Window]
46 Space Replacement.java Medium Java [String]
47 Stone Game.java Medium Java [DP]
48 String Permutation.java Easy Java []
49 Subarray Sum II.java Hard Java [Array, Binary Search, Two Pointers]
50 The Smallest Difference.java Medium Java [Array, Sort, Two Pointers]
51 Total Occurrence of Target.java Medium Java []
52 Trailing Zeros.java Easy Java [Math]
53 Two Lists Sum.java Medium Java [Linked List]
54 Two Strings Are Anagrams.java Easy Java []
55 Valid Sudoku.java Easy Java []
56 Word Pattern.java Easy Java []
57 Zigzag Iterator.java Medium Java [BST]
58 Find Anagram Mappings.java Easy Java [Hash Table]
59 Judge Route Circle.java Easy Java [String]
60 Island Perimeter.java Easy Java [Hash Table]
61 First Unique Character in a String.java Easy Java [Hash Table, String]
62 Power of Three.java Easy Java [Math]
63 Plus One.java Easy Java [Array, Math]
64 Power of Two.java Easy Java [Bit Manipulation, Math]
65 Reverse Vowels of a String.java Easy Java [String, Two Pointers]
66 Guess Number Higher or Lower.java Easy Java [Binary Search]
67 Encode and Decode TinyURL.java Medium Java [Hash Table, Math]
68 Wiggle Sort.java Medium Java [Array, Sort]
69 Queue Reconstruction by Height.java Medium Java [Greedy]
70 Two Sum II - Input array is sorted.java Medium Java [Array, Binary Search, Two Pointers]
71 2 Sum II.java Medium Java [Array, Binary Search, Two Pointers]
72 Coin Change.java Medium Java [Backpack DP, DP, Memoization]
73 Maximum Product Subarray.java Medium Java [Array, DP, Subarray]
74 3 Sum Closest.java Medium Java [Array, Two Pointers]
75 Triangle Count.java Medium Java [Array]
76 3Sum.java Medium Java [Array, Two Pointers]
77 4Sum.java Medium Java [Hash Table]
78 k Sum.java Hard Java [DP]
79 Unique Binary Search Tree.java Medium Java [BST, DP, Tree]
80 Trim a Binary Search Tree.java Easy Java [BST, Tree]
81 Unique Paths II.java Medium Java [Array, Coordinate DP, DP]
82 Bomb Enemy.java Medium Java [Coordinate DP, DP]
83 3Sum Smaller.java Medium Java [Array, Two Pointers]
84 Array Partition I.java Easy Java [Array]
85 1-bit and 2-bit Characters.java Easy Java [Array]
86 Non-decreasing Array.java Easy Java [Array]
87 Max Consecutive Ones.java Easy Java [Array]
88 Find All Numbers Disappeared in an Array.java Easy Java [Array]
89 Maximum Average Subarray I.java Easy Java [Array, Subarray]
90 Largest Number At Least Twice of Others.java Easy Java [Array]
91 Toeplitz Matrix.java Easy Java [Array]
92 Sum of Two Integers.java Easy Java [Bit Manipulation]
93 Swap Bits.java Easy Java [Bit Manipulation]
94 Update Bits.java Medium Java [Bit Manipulation]
95 Maximum XOR of Two Numbers in an Array.java Medium Java [Bit Manipulation, Trie]
96 Perfect Squares.java Medium Java [BFS, DP, Math, Partition DP]
97 Backpack VI.java Medium Java [Backpack DP, DP]
98 Copy Books.java Hard Java [Binary Search, DP, Partition DP]
99 Valid Perfect Square.java Review Java [Binary Search, Math]
100 Intersection of Two Arrays II.java Easy Java [Binary Search, Hash Table, Sort, Two Pointers]
101 Scramble String.java Hard Java [DP, Interval DP, String]
102 Binary Search Tree Iterator.java Medium Java [BST, Design, Stack, Tree]
103 Flatten Nested List Iterator.java Medium Java [Design, Stack]
104 Best Time to Buy and Sell Stock with Cooldown.java Medium Java [DP]
105 Find Peak Element.java Medium Java [Array, Binary Search]
106 Longest Common Subsequence.java Medium Java [DP, Double Sequence DP, Sequence DP]
107 Interleaving String.java Hard Java [DP, String]
108 Letter Combinations of a Phone Number.java Medium Java [Backtracking, String]
109 Edit Distance.java Hard Java [DP, Double Sequence DP, Sequence DP, String]
110 Distinct Subsequences.java Hard Java [DP, String]
111 Regular Expression Matching.java Review Java [Backtracking, DP, String]
112 Majority Element.java Easy Java [Array, Bit Manipulation, Divide and Conquer]
113 Wildcard Matching.java Hard Java [Backtracking, DP, Greedy, String]
114 Ones and Zeroes.java Hard Java [DP]
115 Pow(x, n).java Medium Java [Binary Search, Math]
116 Word Break II.java Hard Java [Backtracking, DFS, DP, Memoization]
117 Nested List Weight Sum.java Easy Java [BFS, DFS]
118 Same Tree.java Easy Java [DFS, Tree]
119 Convert Sorted Array to Binary Search Tree.java Easy Java [DFS, Divide and Conquer, Tree]
120 Construct Binary Tree from Preorder and Inorder Traversal.java Medium Java [Array, DFS, Divide and Conquer, Hash Table, Tree]
121 Add Binary.java Easy Java [Math, String]
122 Add Digits.java Easy Java [Math]
123 Add Two Numbers.java Medium Java [Linked List, Math]
124 Add Two Numbers II.java Medium Java [Linked List]
125 Balanced Binary Tree.java Medium Java [DFS, Tree]
126 Valid Anagram.java Easy Java [Hash Table, Sort]
127 Populating Next Right Pointers in Each Node.java Medium Java [DFS, Divide and Conquer, Tree]
128 Validate Binary Search Tree.java Medium Java [BST, DFS, Divide and Conquer, Tree]
129 Convert Sorted List to Binary Search Tree.java Medium Java [BST, DFS, Divide and Conquer, Linked List]
130 Flatten Binary Tree to Linked List.java Medium Java [Binary Tree, DFS]
131 Binary Tree Paths.java Easy Java [Backtracking, Binary Tree, DFS]
132 Minimum Size Subarray Sum.java Medium Java [Array, Binary Search, Subarray, Two Pointers]
133 Clone Graph.java Medium Java [BFS, DFS, Graph]
134 Longest Substring Without Repeating Characters.java Medium Java [Hash Table, String, Two Pointers]
135 Minimum Window Substring.java Hard Java [Hash Table, String, Two Pointers]
136 Linked List Cycle.java Easy Java [Linked List, Two Pointers]
137 Remove Nth Node From End of List.java Medium Java [Linked List, Two Pointers]
138 Longest Substring with At Most K Distinct Characters.java Medium Java [Hash Table, String]
139 Linked List Cycle II.java Medium Java [Linked List, Math, Two Pointers]
140 Kth Smallest Element in a Sorted Matrix.java Medium Java [Binary Search, Heap]
141 Find Minimum in Rotated Sorted Array.java Medium Java [Array, Binary Search]
142 Find Minimum in Rotated Sorted Array II.java Hard Java [Array, Binary Search]
143 Connecting Graph.java Medium Java [Union Find]
144 Connecting Graph II.java Medium Java [Union Find]
145 Connecting Graph III.java Medium Java [Union Find]
146 Number of Islands.java Medium Java [BFS, DFS, Matrix DFS, Union Find]
147 Number of Islands II.java Hard Java [Union Find]
148 Surrounded Regions.java Medium Java [BFS, DFS, Matrix DFS, Union Find]
149 Implement Trie (Prefix Tree).java Medium Java [Design, Trie]
150 Add and Search Word - Data structure design.java Medium Java [Backtracking, Design, Trie]
151 Word Search II.java Hard Java [Backtracking, DFS, Trie]
152 Word Search.java Medium Java [Array, Backtracking, DFS]
153 Word Squares.java Hard Java [Backtracking, Trie]
154 Trapping Rain Water.java Hard Java [Array, Stack, Two Pointers]
155 Min Stack.java Easy Java [Design, Stack]
156 Implement Queue using Stacks.java Easy Java [Design, Stack]
157 Decode String.java Medium Java [DFS, Divide and Conquer, Stack]
158 Largest Rectangle in Histogram.java Hard Java [Array, Monotonous Stack, Stack]
159 Maximum Binary Tree.java Medium Java [Stack, Tree]
160 Reverse Integer.java Easy Java [Math]
161 Swap Nodes in Pairs.java Medium Java [Linked List]
162 Find Peak Element II.java Hard Java [Binary Search, DFS, Divide and Conquer]
163 Sqrt(x).java Easy Java [Binary Search, Math]
164 First Bad Version.java Easy Java [Binary Search]
165 Wood Cut.java Medium Java [Binary Search]
166 Find the Duplicate Number.java Medium Java [Array, Binary Search, Two Pointers]
167 Palindrome Pairs.java Hard Java [Hash Table, String, Trie]
168 Game of Life.java Medium Java [Array]
169 Maximum Average Subarray II.java Review Java [Array, Binary Search, PreSum]
170 Meeting Rooms.java Easy Java [PriorityQueue, Sort, Sweep Line]
171 Number of Airplane in the sky.java Medium Java [Array, Interval, PriorityQueue, Sort, Sweep Line]
172 Meeting Rooms II.java Medium Java [Greedy, Heap, PriorityQueue, Sort, Sweep Line]
173 The Skyline Problem.java Review Java [Binary Indexed Tree, Divide and Conquer, Heap, PriorityQueue, Segment Tree, Sweep Line]
174 Unique Path.java Medium Java [Array, Coordinate DP, DP]
175 Maximal Rectangle.java Hard Java [Array, DP, Hash Table, Stack]
176 Maximal Square.java Medium Java [Coordinate DP, DP]
177 Longest Increasing Path in a Matrix.java Hard Java [Coordinate DP, DFS, DP, Memoization, Topological Sort]
178 Coins in a Line.java Medium Java [DP, Game Theory, Greedy]
179 Coins in a Line II.java Medium Java [Array, DP, Game Theory, Memoization, MiniMax]
180 Binary Tree Inorder Traversal.java Easy Java [Hash Table, Stack, Tree]
181 Binary Tree Postorder Traversal.java Medium Java [Stack, Tree, Two Stacks]
182 Change to Anagram.java Easy Java [String]
183 Classical Binary Search.java Easy Java [Binary Search]
184 Climbing Stairs.java Easy Java [DP, Memoization, Sequence DP]
185 Coins in a Line III.java Hard Java [Array, DP, Game Theory, Interval DP, Memoization]
186 Closest Binary Search Tree Value.java Easy Java [BST, Binary Search, Tree]
187 Compare Version Numbers.java Medium Java [String]
188 Count Complete Tree Nodes.java Medium Java [Binary Search, Tree]
189 Course Schedule.java Medium Java [BFS, Backtracking, DFS, Graph, Topological Sort]
190 Course Schedule II.java Medium Java [BFS, DFS, Graph, Topological Sort]
191 Binary Tree Preorder Traversal.java Easy Java [BFS, DFS, Stack, Tree]
192 Closest Number in Sorted Array.java Easy Java [Binary Search]
193 Complete Binary Tree.java Easy Java [BFS, Tree]
194 Compare Strings.java Easy Java [String]
195 Contains Duplicate.java Easy Java [Array, Hash Table]
196 Contains Duplicate II.java Easy Java [Array, Hash Table]
197 Contains Duplicate III.java Medium Java [BST]
198 Burst Balloons.java Hard Java [DP, Divide and Conquer, Interval DP, Memoization]
199 Nim Game.java Easy Java [Brainteaser, DP, Game Theory]
200 Convert Integer A to Integer B.java Easy Java [Bit Manipulation]
201 Cosine Similarity.java Easy Java [Basic Implementation]
202 Count 1 in Binary.java Easy Java [Bit Manipulation]
203 Count and Say.java Easy Java [Basic Implementation, String]
204 One Edit Distance.java Medium Java [String]
205 K Edit Distance.java Hard Java [DP, Double Sequence DP, Sequence DP, Trie]
206 Jump Game.java Medium Java [Array, DP, Greedy]
207 Coin Change 2.java Medium Java [Backpack DP, DP]
208 Paint House.java Easy Java [DP, Sequence DP, Status DP]
209 Decode Ways.java Medium Java [DP, Partition DP, String]
210 Longest Continuous Increasing Subsequence.java Easy Java [Array, Coordinate DP, DP]
211 Minimum Path Sum.java Medium Java [Array, Coordinate DP, DP]
212 Counting Bits.java Medium Java [Bit Manipulation, Bitwise DP, DP]
213 Continuous Subarray Sum.java Medium Java [Coordinate DP, DP, Math, Subarray]
214 House Robber.java Easy Java [DP, Sequence DP]
215 House Robber II.java Medium Java [DP, Sequence DP, Status DP]
216 House Robber III.java Medium Java [DFS, DP, Status DP, Tree]
217 Paint House II.java Hard Java [DP, Sequence DP, Status DP]
218 Best Time to Buy and Sell Stock III.java Hard Java [Array, DP, Sequence DP]
219 Best Time to Buy and Sell Stock IV.java Hard Java [DP, Sequence DP]
220 Russian Doll Envelopes.java Hard Java [Binary Search, Coordinate DP, DP]
221 Permutation in String.java Medium Java [Two Pointers]
222 Permutations II.java Medium Java [Backtracking]
223 Shuffle an Array.java Medium Java [Permutation]
224 Find All Anagrams in a String.java Easy Java [Hash Table, Sliding Window]
225 Group Anagrams.java Medium Java [Hash Table, String]
226 Backpack.java Medium Java [Backpack DP, DP]
227 Backpack II.java Medium Java [Backpack DP, DP]
228 Backpack V.java Medium Java [Backpack DP, DP]
229 Count Primes.java Easy Java [Hash Table, Math]
230 Delete Node in a Linked List.java Easy Java [Linked List]
231 Excel Sheet Column Number.java Easy Java [Math]
232 Excel Sheet Column Title.java Easy Java [Math]
233 Flip Game.java Easy Java [String]
234 Expression Tree Build.java Hard Java [Binary Tree, Expression Tree, Minimum Binary Tree, Stack]
235 Expression Evaluation.java Hard Java [Binary Tree, DFS, Expression Tree, Minimum Binary Tree, Stack]
236 Convert Expression to Polish Notation.java Hard Java [Binary Tree, DFS, Expression Tree, Stack]
237 Convert Expression to Reverse Polish Notation.java Hard Java [Binary Tree, DFS, Expression Tree, Stack]
238 Evaluate Reverse Polish Notation.java Medium Java [Stack]
239 Decode Ways II.java Hard Java [DP, Enumeration, Partition DP]
240 Palindrome Partitioning II.java Hard Java [DP, Partition DP]
241 Backpack III.java Hard Java [Backpack DP, DP]
242 First Missing Positive.java Hard Java [Array]
243 Implement strStr().java Easy Java [String, Two Pointers]
244 Insertion Sort List.java Medium Java [Linked List, Sort]
245 Interleaving Positive and Negative Numbers.java Medium Java [Two Pointers]
246 Largest Number.java Medium Java [Sort]
247 Last Position of Target.java Easy Java [Binary Search]
248 Length of Last Word.java Easy Java [String]
249 Longest Common Substring.java Medium Java [DP, Double Sequence DP, Sequence DP, String]
250 Longest Increasing Continuous subsequence.java Easy Java [Array, Coordinate DP, DP]
251 Longest Increasing Continuous subsequence II.java Medium Java [Array, Coordinate DP, DP, Memoization]
252 N-Queens.java Hard Java [Backtracking]
253 N-Queens II.java Hard Java [Backtracking]
254 Maximum Subarray.java Easy Java [Array, DFS, DP, Divide and Conquer, PreSum, Sequence DP, Subarray]
255 Maximum Subarray II.java Medium Java [Array, DP, Greedy, PreSum, Sequence DP, Subarray]
256 Median.java Easy Java [Array, Quick Select, Quick Sort]
257 Middle of Linked List.java Easy Java [Linked List]
258 Singleton.java Easy Java [Design]
259 Remove Linked List Elements.java Easy Java [Linked List]
260 Fibonacci.java Easy Java [DP, Math, Memoization]
261 Palindrome Linked List.java Easy Java [Linked List, Two Pointers]
262 Reverse Linked List.java Easy Java [Linked List]
263 Reverse Linked List II .java Medium Java [Linked List]
264 Intersection of Two Linked Lists.java Easy Java [Linked List]
265 Palindrome Permutation.java Easy Java [Hash Table]
266 Valid Palindrome.java Easy Java [String, Two Pointers]
267 Implement Stack using Queues.java Easy Java [Design, Stack]
268 Implement Stack.java Easy Java [Stack]
269 Invert Binary Tree.java Easy Java [BFS, DFS, Tree]
270 Maximum Depth of Binary Tree.java Easy Java [DFS, Tree]
271 Minimum Depth of Binary Tree.java Easy Java [BFS, DFS, Tree]
272 Symmetric Tree.java Easy Java [BFS, DFS, Tree]
273 Tweaked Identical Binary Tree.java Easy Java [DFS, Tree]
274 Merge Two Binary Trees.java Easy Java [DFS, Tree]
275 Subtree.java Easy Java [DFS, Tree]
276 Lowest Common Ancestor of a Binary Tree.java Medium Java [DFS, Tree]
277 Lowest Common Ancestor II.java Easy Java [Hash Table, Tree]
278 Lowest Common Ancestor of a Binary Search Tree.java Medium Java [BST, DFS, Tree]
279 Hash Function.java Easy Java [Hash Table]
280 Merge Two Sorted Lists.java Easy Java [Linked List]
281 Missing Number.java Easy Java [Array, Bit Manipulation, Math]
282 LRU Cache.java Hard Java [Design, Hash Table, Linked List]
283 Remove Duplicates from Sorted Array.java Easy Java [Array, Two Pointers]
284 Remove Duplicates from Sorted Array II.java Medium Java [Array, Two Pointers]
285 Remove Duplicates from Sorted List.java Easy Java [Linked List]
286 Remove Duplicates from Sorted List II.java Medium Java [Linked List]
287 QuickSort.java Medium Java [Quick Sort, Sort]
288 MergeSort.java Medium Java [Merge Sort, Sort]
289 Longest Word in Dictionary.java Easy Java [Hash Table, Trie]
290 Binary Tree Level Order Traversal.java Medium Java [BFS, DFS, Tree]
291 Binary Tree Level Order Traversal II.java Medium Java [BFS, Tree]
292 Binary Tree Longest Consecutive Sequence II.java Medium Java [DFS, Divide and Conquer, Double Recursive, Tree]
293 Binary Tree Maximum Path Sum.java Hard Java [DFS, DP, Tree, Tree DP]
294 Path Sum.java Easy Java [DFS, Tree]
295 Path Sum II.java Easy Java [Backtracking, DFS, Tree]
296 Path Sum III.java Easy Java [DFS, Double Recursive, Tree]
297 Rotate String.java Easy Java [String]
298 Combinations.java Medium Java [Backtracking, Combination, DFS]
299 Combination Sum IV.java Medium Java [Array, Backpack DP, DP]
300 Binary Tree Right Side View.java Medium Java [BFS, DFS, Tree]
301 Binary Tree Maximum Path Sum II.java Medium Java [DFS, Tree]
302 Rotate List.java Medium Java [Linked List, Two Pointers]
303 Basic Calculator.java Hard Java [Binary Tree, Expression Tree, Math, Minimum Binary Tree, Stack]
304 Longest Consecutive Sequence.java Hard Java [Array, Hash Table, Union Find]
305 Binary Tree Longest Consecutive Sequence.java Medium Java [DFS, Divide and Conquer, Tree]
306 Number of Connected Components in an Undirected Graph.java Medium Java [BFS, DFS, Graph, Union Find]
307 Next Closest Time.java Medium Java [Basic Implementation, Enumeration, String]
308 Serialize and Deserialize Binary Tree.java Hard Java [BFS, DFS, Deque, Design, Divide and Conquer, Tree]
309 Partition Array.java Medium Java [Array, Quick Sort, Sort, Two Pointers]
310 Word Ladder.java Medium Java [BFS]
311 Unique Word Abbreviation.java Medium Java [Design, Hash Table]
312 Unique Binary Search Tree II.java Medium Java [BST, DP, Divide and Conquer, Tree]
313 Ugly Number.java Medium Java [Math]
314 Top K Frequent Words.java Medium Java [Hash Table, Heap, MaxHeap, MinHeap, PriorityQueue, Trie]
315 Segment Tree Build.java Medium Java [Binary Tree, Divide and Conquer, Lint, Segment Tree]
316 Segment Tree Build II.java Medium Java [Binary Tree, Divide and Conquer, Lint, Segment Tree]
317 Segment Tree Query.java Medium Java [Binary Tree, DFS, Divide and Conquer, Lint, Segment Tree]
318 Segment Tree Modify.java Medium Java [Binary Tree, DFS, Divide and Conquer, Lint, Segment Tree]
319 Segment Tree Query II.java Medium Java [Binary Tree, DFS, Divide and Conquer, Lint, Segment Tree]
320 Count of Smaller Numbers After Self.java Hard Java [BST, Binary Indexed Tree, Binary Search, Divide and Conquer, Segment Tree]
321 ColorGrid.java Medium Java [Design, Hash Table]
322 Container With Most Water.java Medium Java [Array, Two Pointers]
323 Copy List with Random Pointer.java Medium Java [Hash Table, Linked List]
324 Encode and Decode Strings.java Medium Java [String]
325 Fast Power.java Medium Java [DFS, Divide and Conquer]
326 Find the Connected Component in the Undirected Graph.java Medium Java [BFS, DFS]
327 HashWithCustomizedClass(LinkedList).java Medium Java [Hash Table]
328 Interval Minimum Number.java Medium Java [Binary Search, Divide and Conquer, Lint, Segment Tree]
329 Interval Sum.java Medium Java [Binary Search, Lint, Segment Tree]
330 Kth Smallest Element in a BST.java Medium Java [BST, DFS, Stack, Tree]
331 Longest Common Prefix.java Easy Java [String]
332 Majority Element II.java Medium Java [Array]
333 Permutations.java Medium Java [Backtracking, DFS, Permutation]
334 Partition List.java Medium Java [Linked List, Two Pointers]
335 Peeking Iterator.java Medium Java [Design]
336 Rehashing.java Medium Java [Hash Table]
337 Reorder List.java Medium Java [Linked List]
338 Restore IP Addresses.java Medium Java [Backtracking, DFS, String]
339 Reverse Words in a String.java Medium Java [String]
340 Reverse Words in a String II.java Medium Java [String]
341 Reverse Words in a String III.java Easy Java [String]
342 Search a 2D Matrix.java Medium Java [Array, Binary Search]
343 Search a 2D Matrix II.java Medium Java [Binary Search, Divide and Conquer]
344 Search for a Range.java Medium Java [Array, Binary Search]
345 Search Range in Binary Search Tree .java Medium Java [BST, Binary Tree]
346 Merge Sorted Array II.java Easy Java [Array]
347 Nth to Last Node in List.java Easy Java [Linked List]
348 Sort List.java Medium Java [Divide and Conquer, Linked List, Merge Sort, Sort]
349 Summary Ranges.java Medium Java [Array]
350 Topological Sorting.java Medium Java [BFS, DFS, Topological Sort]
351 Median of Two Sorted Arrays.java Hard Java [Array, Binary Search, DFS, Divide and Conquer]
352 Remove Duplicate Letters.java Hard Java [Greedy, Hash Table, Stack]
353 Spiral Matrix.java Medium Java [Array, Enumeration]
354 Expression Add Operators.java Hard Java [Backtracking, DFS, Divide and Conquer, String]
355 Insert Interval.java Hard Java [Array, PriorityQueue, Sort]
356 Shortest Palindrome.java Hard Java [KMP, String]
357 Two Sum.java Easy Java [Array, Hash Table]
358 K Empty Slots.java Hard Java [Array, BST, TreeSet]
359 Count of Range Sum.java Hard Java [BST, Divide and Conquer, Merge Sort, PreSum]
360 Max Sum of Rectangle No Larger Than K.java Hard Java [Array, BST, Binary Search, DP, Queue, TreeSet]
361 Perfect Rectangle.java Hard Java [Design, Geometry, Hash Table]
362 Construct Binary Tree from Inorder and Postorder Traversal.java Medium Java [Array, DFS, Divide and Conquer, Tree]
363 Generate Parentheses.java Medium Java [Backtracking, DFS, Sequence DFS, String]
364 Strobogrammatic Number II.java Medium Java [DFS, Math, Sequence DFS]
365 Flip Game II.java Medium Java [Backtracking, DFS, DP]
366 Max Area of Island.java Easy Java [Array, DFS]
367 Max Points on a Line.java Hard Java [Array, Geometry, Hash Table, Math]
368 Number of Digit One.java Hard Java [Math]
369 Binary Representation.java Hard Java [Bit Manipulation, String]
370 Palindrome Partitioning.java Medium Java [Backtracking, DFS]
371 Recover Binary Search Tree.java Hard Java [BST, DFS, Tree]
372 Subarray Sum.java Easy Java [Array, Hash Table, PreSum, Subarray]
373 Submatrix Sum.java Medium Java [Array, Hash Table, PreSum]
374 Longest Palindromic Substring.java Medium Java [DP, String]
375 Longest Palindromic Subsequence.java Medium Java [DFS, DP, Interval DP, Memoization]
376 Jump Game II.java Hard Java [Array, Coordinate DP, DP, Greedy]
377 Gas Station.java Medium Java [Greedy]
378 Triangles.java Medium Java [Array, Coordinate DP, DFS, DP, Memoization]
379 Range Sum Query - Immutable.java Easy Java [DP, PreSum]
380 Longest Valid Parentheses.java Hard Java [Coordinate DP, Stack, String]
381 Remove Invalid Parentheses.java Review Java [BFS, DFS, DP]
382 Merge Intervals.java Medium Java [Array, PriorityQueue, Sort, Sweep Line]
383 H-Index.java Medium Java [Bucket Sort, Hash Table, Sort]
384 H-Index II.java Medium Java [Binary Search]
385 Sort Colors.java Medium Java [Array, Partition, Quick Sort, Sort, Two Pointers]
386 Sort Colors II.java Medium Java [Partition, Quick Sort, Sort, Two Pointers]
387 Sort Letters by Case.java Medium Java [Partition, Sort, String, Two Pointers]
388 Subarray Sum Closest.java Medium Java [PreSum, PriorityQueue, Sort, Subarray]
389 Task Scheduler.java Medium Java [Array, Enumeration, Greedy, PriorityQueue, Queue]
390 Rearrange String k Distance Apart.java Hard Java [Greedy, Hash Table, Heap]
391 Exam Room.java Medium Java [PriorityQueue, Sort]
392 Anagrams.java Medium Java [Array, Hash Table]
393 Path Sum IV.java Medium Java [DFS, Hash Table, Tree]
394 Longest Words.java Easy Java [Hash Table, String]
395 Unique Characters.java Easy Java [Array, String]
396 Number Of Corner Rectangles.java Medium Java [DP, Math]
397 Palindromic Substrings.java Medium Java [DP, String]
398 Multiply Strings.java Medium Java [Math, String]
399 Subsets.java Medium Java [Array, BFS, Backtracking, Bit Manipulation, DFS]
400 Subsets II.java Medium Java [Array, BFS, Backtracking, DFS]
401 Combination Sum.java Medium Java [Array, Backtracking, Combination, DFS]
402 Combination Sum II.java Medium Java [Array, Backtracking, Combination, DFS]
403 Combination Sum III.java Medium Java [Array, Backtracking, Combination, DFS]
404 Product of Array Except Self.java Medium Java [Array]
405 Total Hamming Distance.java Medium Java [Bit Manipulation]
406 Smallest Subtree with all the Deepest Nodes.java Medium Java [DFS, Divide and Conquer, Tree]
407 Binary Gap.java Easy Java [Bit Manipulation]
408 Subarray Sum Equals K.java Medium Java [Array, Hash Table, PreSum, Subarray]
409 Maximize Distance to Closest Person.java Easy Java [Array]
410 Simplify Path.java Medium Java [Stack, String]
411 Convert Binary Search Tree to Sorted Doubly Linked List (extra space).java Medium Java [Linked List, Stack, Tree]
412 Paint Fence.java Easy Java [DP, Sequence DP]
413 Binary Tree Zigzag Level Order Traversal.java Medium Java [BFS, Stack, Tree]
414 Word Break.java Medium Java [DP, Sequence DP]
415 Best Time to Buy and Sell Stock.java Easy Java [Array, DP, Sequence DP]
416 Best Time to Buy and Sell Stock II.java Easy Java [Array, DP, Greedy, Sequence DP, Status DP]
417 Longest Increasing Subsequence.java Medium Java [Binary Search, Coordinate DP, DP, Memoization]
418 Best Time to Buy and Sell Stock with Transaction Fee.java Medium Java [Array, DP, Greedy, Sequence DP, Status DP]
419 Random Pick Index.java Medium Java [Reservior Sampling]
420 Find the Celebrity.java Medium Java [Array, Greedy]
421 Sparse Matrix Multiplication.java Medium Java [Hash Table]
422 Brick Wall.java Medium Java [Hash Table]
423 Exclusive Time of Functions.java Medium Java [Stack]
424 Friends Of Appropriate Ages.java Medium Java [Array, Math]
425 Target Sum.java Medium Java [DFS, DP]
426 Maximum Size Subarray Sum Equals k.java Medium Java [Hash Table, PreSum, Subarray]
427 Contiguous Array.java Medium Java [Hash Table]
428 Line Reflection.java Medium Java [Hash Table, Math]
429 Insert Delete GetRandom O(1).java Medium Java [Array, Design, Hash Table]
430 Number of Longest Increasing Subsequence.java Medium Java [Coordinate DP, DP]
431 Minimum Swaps To Make Sequences Increasing.java Medium Java [Coordinate DP, DP, Status DP]
432 Binary Tree Vertical Order Traversal.java Medium Java [BFS, DFS, Hash Table, Tree]
433 Populating Next Right Pointers in Each Node II.java Medium Java [DFS, Tree]
434 Search in Rotated Sorted Array.java Medium Java [Array, Binary Search]
435 Minimum Subarray.java Easy Java [Array, DP, Greedy, Sequence DP, Subarray]
436 Valid Number.java Hard Java [Math, String]
437 Find the Weak Connected Component in the Directed Graph.java Medium Java [Union Find]
438 Graph Valid Tree.java Medium Java [BFS, DFS, Graph, Union Find]
439 Accounts Merge.java Medium Java [DFS, Hash Table, Hash Table, Union Find]
440 Bricks Falling When Hit.java Hard Java [Union Find]
441 Interval Sum II.java Hard Java [Binary Search, Lint, Segment Tree]
442 Count of Smaller Number.java Medium Java [Binary Search, Lint, Segment Tree]
443 HashHeap.java Hard Java [HashHeap, Heap]
444 My Calendar I.java Medium Java [Array, TreeMap]
445 Reverse Pairs.java Medium Java [Binary Indexed Tree, Binary Search Tree, Divide and Conquer, Merge Sort, Segment Tree]
446 Trapping Rain Water II.java Hard Java [BFS, Heap, MinHeap, PriorityQueue]
447 Kth Largest Element in an Array.java Medium Java [Divide and Conquer, Heap, MinHeap, PriorityQueue, Quick Sort]
448 Merge k Sorted Lists.java Medium Java [Divide and Conquer, Heap, Linked List, PriorityQueue]
449 Merge k Sorted Arrays.java Medium Java [Heap, MinHeap, PriorityQueue]
450 Heapify.java Medium Java [Heap, MinHeap]
451 Top K Frequent Elements.java Medium Java [Hash Table, Heap, MaxHeap, MinHeap, PriorityQueue]
452 Ugly Number II.java Medium Java [DP, Enumeration, Heap, Math, PriorityQueue]
453 Find Median from Data Stream.java Hard Java [Design, Heap, MaxHeap, MinHeap]
454 Sliding Window Median.java Hard Java [Design, Heap, MaxHeap, MinHeap, Sliding Window]
455 Inorder Successor in BST.java Medium Java [BST, Tree]
456 Subtree of Another Tree.java Easy Java [DFS, Divide and Conquer, Tree]
457 Two Sum IV - Input is a BST.java Easy Java [Tree]
458 Read N Characters Given Read4.java Easy Java [Enumeration, String]
459 Design Search Autocomplete System.java Hard Java [Design, Hash Table, MinHeap, PriorityQueue, Trie]
460 Walls and Gates.java Medium Java [BFS, DFS]
461 Merge Sorted Array.java Easy Java [Array, Two Pointers]
462 Integer to English Words.java Hard Java [Enumeration, Math, String]
463 Alien Dictionary.java Hard Java [BFS, Backtracking, DFS, Graph, Topological Sort]
464 Valid Palindrome II.java Easy Java [String]
465 Convert Binary Search Tree to Sorted Doubly Linked List.java Medium Java [BST, DFS, Divide and Conquer, Linked List, Tree]
466 Word Ladder II.java Hard Java [Array, BFS, Backtracking, DFS, Hash Table, String]
467 Moving Average from Data Stream.java Easy Java [Design, Queue, Sliding Window]
468 Move Zeroes.java Easy Java [Array, Two Pointers]
469 Flood Fill.java Easy Java [DFS]
470 Diameter of Binary Tree.java Easy Java [Tree]
471 Backspace String Compare.java Easy Java [Stack, Two Pointers]
472 Text Justification.java Hard Java [Enumeration, String]
473 Read N Characters Given Read4 II - Call multiple times.java Hard Java [Enumeration, String]
474 Frog Jump.java Hard Java [DP, Hash Table]
475 Longest Substring with At Most Two Distinct Characters.java Hard Java [Hash Table, Sliding Window, String, Two Pointers]
476 Shortest Distance from All Buildings.java Hard Java [BFS]
477 String to Integer (atoi).java Medium Java [Math, String]
478 Roman to Integer.java Easy Java [Math, String]
479 Intersection of Two Arrays.java Easy Java [Binary Search, Hash Table, Sort, Two Pointers]
480 Strobogrammatic Number.java Easy Java [Hash Table, Math]
481 Valid Parentheses.java Easy Java [Stack, String]

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Java Solutions to problems on LintCode/LeetCode

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