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Java Algorithm Problems

程序员的一天

从开始这个Github已经有将近两年时间, 很高兴这个repo可以帮到有需要的人. 我一直认为, 知识本身是无价的, 因此每逢闲暇, 我就会来维护这个repo, 给刷题的朋友们一些我的想法和见解. 下面来简单介绍一下这个repo:

README.md: 所有所做过的题目

ReviewPage.md: 所有题目的总结和归纳（不断完善中）

KnowledgeHash2.md: 对所做过的知识点的一些笔记

SystemDesign.md: 对系统设计的一些笔记

Future Milestone: 我准备将一些有意思的题目，做成视频的形式给大家参考

希望大家学习顺利, 对未来充满希望(程序员也是找到好老板的!) 有问题可以给我写邮件(wangdeve@gmail.com), 或者在GitHub上发issue给我.

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

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Java Solutions to problems on LintCode/LeetCode

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