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

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Java Solutions to problems on LintCode/LeetCode

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