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lintcode's Introduction

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

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