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

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Java Solutions to problems on LintCode/LeetCode

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