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

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