LeetCode Tags

Array Hash Table Linked List Math Two Pointers String Dynamic Programming Backtracking Divide and Conquer Binary Search Stack Heap Greedy Sort Graph Depth First Search Breadth First Search Bit Manipulation Tree Union Find Design Topological Sort Trie Binary Search Tree Brainteaser Segment Tree Binary Index Tree Memoization Binary Indexed Tree

Array

1. Two Sum 27 May 2016
11. Container with Most Water 23 Jun 2016
4. Median of Two Sorted Arrays 24 Jun 2016
15. 3Sum 25 Jun 2016
16. 3Sum Closest 25 Jun 2016
18. 4Sum 25 Jun 2016
26. Remove Duplicates from Sorted Array 25 Jun 2016
27. Remove Element 25 Jun 2016
31. Next Permutation 26 Jun 2016
33. Search in Rotated Sorted Array 26 Jun 2016
34. Search for A Range 26 Jun 2016
35. Search Insert Position 26 Jun 2016
39. Combination Sum 26 Jun 2016
40. Combination Sum II 26 Jun 2016
41. First Missing Positive 26 Jun 2016
42. Trapping Rain Water 26 Jun 2016
45. Jump Game II 26 Jun 2016
48. Rotate Image 27 Jun 2016
53. Maximum Subarray 27 Jun 2016
54. Spiral Matrix 27 Jun 2016
55. Jump Game 27 Jun 2016
56. Merge Intervals 27 Jun 2016
57. Insert Interval 27 Jun 2016
59. Spiral Matrix II 28 Jun 2016
62. Unique Paths 28 Jun 2016
63. Unique Paths II 28 Jun 2016
64. Minimum Path Sum 28 Jun 2016
66. Plus One 28 Jun 2016
73. Set Matrix Zeroes 28 Jun 2016
74. Search A 2D Matrix 28 Jun 2016
75. Sort Colors 28 Jun 2016
78. Subsets 28 Jun 2016
79. Word Search 28 Jun 2016
80. Remove Duplicates from Sorted Array II 28 Jun 2016
81. Search in Rotated Sorted Array II 28 Jun 2016
84. Largest Rectangle in Histogram 28 Jun 2016
85. Maximal Rectangle 28 Jun 2016
88. Merge Sorted Array 07 Jul 2016
90. Subsets II 07 Jul 2016
105. Construct Binary Tree from Preorder and Inorder Traversal 11 Jul 2016
106. Construct Binary Tree from Inorder and Postorder traversal 11 Jul 2016
118. Pascal's Triangle 11 Jul 2016
119. Pascal's Triangle II 11 Jul 2016
120. Triangle 11 Jul 2016
121. Best Time to Buy and Sell Stock 11 Jul 2016
122. Best Time to Buy and Sell Stock II 11 Jul 2016
123. Best Time to Buy and Sell Stock III 11 Jul 2016
126. Word Ladder II 13 Jul 2016
128. Longest Consecutive Sequence 13 Jul 2016
152. Maximum Product Subarray 15 Jul 2016
153. Find Minimum in Rotated Sorted Array 15 Jul 2016
154. Find Minimum in Rotated Sorted Array II 15 Jul 2016
162. Find Peek Element 15 Jul 2016
169. Majority Element 16 Jul 2016
189. Rotate Array 16 Jul 2016
209. Minimum Size Subarray Sum 16 Jul 2016
216. Combination Sum III 16 Jul 2016
217. Contains Duplicate 16 Jul 2016
219. Contains Duplicate II 16 Jul 2016
238. Product of Array Except Self 16 Jul 2016
268. Missing Number 17 Jul 2016
283. Move Zeroes 17 Jul 2016
287. Find the Duplicate Number 17 Jul 2016
289. Game of Life 17 Jul 2016
334. Increasing Triplet Subsequence 18 Jul 2016

Hash Table

1. Two Sum 27 May 2016
3. Longest Substring Without Repeating Characters 22 Jun 2016
18. 4Sum 25 Jun 2016
37. Sudoku Solver 25 Jun 2016
30. Substring with Concatenation of All Words 26 Jun 2016
36. Valid Sudoku 26 Jun 2016
49. Group Anagrams 27 Jun 2016
51. N-Queens 27 Jun 2016
52. N-Queens 27 Jun 2016
76. Minimum Window Substring 28 Jun 2016
85. Maximal Rectangle 28 Jun 2016
94. Binary Tree Inorder Traversal 07 Jul 2016
136. Single Number 13 Jul 2016
138. Copy List with Random Pointer 13 Jul 2016
149. Max Points on A Line 15 Jul 2016
166. Fraction to Recurring Decimal 15 Jul 2016
187. Repeated DNA Sequences 16 Jul 2016
202. Happy Number 16 Jul 2016
204. Count Primes 16 Jul 2016
205. Isomorphic Strings 16 Jul 2016
217. Contains Duplicate 16 Jul 2016
219. Contains Duplicate II 16 Jul 2016
242. Valid Anagram 16 Jul 2016
274. H-Index 17 Jul 2016
290. Word Pattern 17 Jul 2016
299. Bulls and Cows 17 Jul 2016
347. Top K Frequent Elements 18 Jul 2016
349. Intersection of Two Arrays 18 Jul 2016
350. Intersection of Two Arrays II 18 Jul 2016

Linked List

2. Add Two Numbers 17 Jun 2016
19. Remove Nth Node from End of List 25 Jun 2016
21. Merge Two Sorted Lists 25 Jun 2016
24. Swap Nodes in Pairs 25 Jun 2016
23. Merge K Sorted Lists 26 Jun 2016
25. Reverse Nodes in k-Group 26 Jun 2016
61. Rotate List 28 Jun 2016
82. Remove Duplicates from Sorted List II 28 Jun 2016
86. Partition List 28 Jun 2016
92. Reverse Linked List II 07 Jul 2016
109. Convert Sorted List to Binary Search Tree 11 Jul 2016
138. Copy List with Random Pointer 13 Jul 2016
141. Linked List Cycle 13 Jul 2016
142. Linked List Cycle II 13 Jul 2016
143. Reorder List 13 Jul 2016
147. Insertion Sort List 15 Jul 2016
148. Sort List 15 Jul 2016
160. Intersection of Two Linked Lists 15 Jul 2016
203. Remove Linked List Elements 16 Jul 2016
206. Reverse Linked List 16 Jul 2016
234. Palindrome Linked List 16 Jul 2016
237. Delete Node in a Linked List 16 Jul 2016
328. Odd Even Linked List 18 Jul 2016

Math

2. Add Two Numbers 17 Jun 2016
13. Roman to Integer 23 Jun 2016
7. Reverse Integer 23 Jun 2016
8. String to Integer (atoi) 23 Jun 2016
9. Palindrome Number 23 Jun 2016
12. Integer to Roman 25 Jun 2016
29. Divide Two Integers 26 Jun 2016
31. Next Permutation 26 Jun 2016
43. Multiply Strings 26 Jun 2016
50. Pow(x, n) 27 Jun 2016
60. Permutation Sequence 28 Jun 2016
65. Valid Number 28 Jun 2016
66. Plus One 28 Jun 2016
67. Add Binary 28 Jun 2016
69. Sqrt(x) 28 Jun 2016
149. Max Points on A Line 15 Jul 2016
166. Fraction to Recurring Decimal 15 Jul 2016
168. Excel Sheet Column Title 15 Jul 2016
171. Excel Sheet Column Number 16 Jul 2016
172. Factorial Trailing Zeroes 16 Jul 2016
202. Happy Number 16 Jul 2016
204. Count Primes 16 Jul 2016
223. Rectangle Area 16 Jul 2016
224. Basic Calculator 16 Jul 2016
231. Power of Two 16 Jul 2016
258. Add Digits 16 Jul 2016
263. Ugly Number 16 Jul 2016
264. Ugly Number II 17 Jul 2016
268. Missing Number 17 Jul 2016
279. Perfect Squares 17 Jul 2016
306. Additive Number 17 Jul 2016
313. Super Ugly Number 17 Jul 2016
319. Bulb Switcher 17 Jul 2016
233. Number of Digit One 18 Jul 2016
326. Power of Three 18 Jul 2016
342. Power of Four 18 Jul 2016
343. Integer Break 18 Jul 2016

Two Pointers

3. Longest Substring Without Repeating Characters 22 Jun 2016
11. Container with Most Water 23 Jun 2016
15. 3Sum 25 Jun 2016
16. 3Sum Closest 25 Jun 2016
18. 4Sum 25 Jun 2016
19. Remove Nth Node from End of List 25 Jun 2016
26. Remove Duplicates from Sorted Array 25 Jun 2016
27. Remove Element 25 Jun 2016
28. Implement strStr() 25 Jun 2016
30. Substring with Concatenation of All Words 26 Jun 2016
42. Trapping Rain Water 26 Jun 2016
61. Rotate List 28 Jun 2016
75. Sort Colors 28 Jun 2016
76. Minimum Window Substring 28 Jun 2016
80. Remove Duplicates from Sorted Array II 28 Jun 2016
86. Partition List 28 Jun 2016
88. Merge Sorted Array 07 Jul 2016
125. Valid Palindrome 11 Jul 2016
141. Linked List Cycle 13 Jul 2016
142. Linked List Cycle II 13 Jul 2016
209. Minimum Size Subarray Sum 16 Jul 2016
234. Palindrome Linked List 16 Jul 2016
283. Move Zeroes 17 Jul 2016
287. Find the Duplicate Number 17 Jul 2016
344. Reverse String 18 Jul 2016
345. Reverse Vowels of a String 18 Jul 2016
349. Intersection of Two Arrays 18 Jul 2016
350. Intersection of Two Arrays II 18 Jul 2016

String

3. Longest Substring Without Repeating Characters 22 Jun 2016
10. Regular Expression Matching 23 Jun 2016
13. Roman to Integer 23 Jun 2016
14. Longest Common Prefix 23 Jun 2016
5. Longest Palindromic Substring 23 Jun 2016
6. ZigZag Conversion 23 Jun 2016
8. String to Integer (atoi) 23 Jun 2016
12. Integer to Roman 25 Jun 2016
17. Letter Combinations of A Phone Number 25 Jun 2016
20. Valid Parentheses 25 Jun 2016
28. Implement strStr() 25 Jun 2016
32. Longest Valid Parentheses 25 Jun 2016
22. Generate Parentheses 26 Jun 2016
30. Substring with Concatenation of All Words 26 Jun 2016
38. Count and Say 26 Jun 2016
43. Multiply Strings 26 Jun 2016
44. Wildcard Matching 26 Jun 2016
49. Group Anagrams 27 Jun 2016
58. Length of Last Word 27 Jun 2016
65. Valid Number 28 Jun 2016
67. Add Binary 28 Jun 2016
68. Text Justification 28 Jun 2016
71. Simplify Path 28 Jun 2016
72. Edit Distance 28 Jun 2016
76. Minimum Window Substring 28 Jun 2016
87. Scramble String 28 Jun 2016
91. Decode Ways 07 Jul 2016
93. Restore IP Addresses 07 Jul 2016
115. Distinct Subsequences 11 Jul 2016
125. Valid Palindrome 11 Jul 2016
97. Interleaving String 11 Jul 2016
126. Word Ladder II 13 Jul 2016
127. Word Ladder 13 Jul 2016
139. Word Break 13 Jul 2016
140. Word Break II 13 Jul 2016
151. Reverse Words in A String 15 Jul 2016
165. Compare Version Numbers 15 Jul 2016
214. Shortest Palindrome 16 Jul 2016
227. Basic Calculator II 16 Jul 2016
306. Additive Number 17 Jul 2016
344. Reverse String 18 Jul 2016
345. Reverse Vowels of a String 18 Jul 2016

Dynamic Programming

10. Regular Expression Matching 23 Jun 2016
32. Longest Valid Parentheses 25 Jun 2016
44. Wildcard Matching 26 Jun 2016
53. Maximum Subarray 27 Jun 2016
62. Unique Paths 28 Jun 2016
63. Unique Paths II 28 Jun 2016
64. Minimum Path Sum 28 Jun 2016
70. Climbing Stairs 28 Jun 2016
72. Edit Distance 28 Jun 2016
85. Maximal Rectangle 28 Jun 2016
87. Scramble String 28 Jun 2016
91. Decode Ways 07 Jul 2016
95. Unique Binary Search Tree II 07 Jul 2016
115. Distinct Subsequences 11 Jul 2016
120. Triangle 11 Jul 2016
121. Best Time to Buy and Sell Stock 11 Jul 2016
123. Best Time to Buy and Sell Stock III 11 Jul 2016
96. Unique Binary Search Trees 11 Jul 2016
97. Interleaving String 11 Jul 2016
132. Palindrome Partitioning II 13 Jul 2016
139. Word Break 13 Jul 2016
140. Word Break II 13 Jul 2016
152. Maximum Product Subarray 15 Jul 2016
188. Best Time to Buy and Sell Stock IV 16 Jul 2016
198. House Robber 16 Jul 2016
213. House Robber II 16 Jul 2016
221. Maximal Square 16 Jul 2016
264. Ugly Number II 17 Jul 2016
279. Perfect Squares 17 Jul 2016
300. Longest Increasing Subsequence 17 Jul 2016
303. Range Sum Query Immutable 17 Jul 2016
304. Range Sum Query 2D - Immutable 17 Jul 2016
306. Additive Number 17 Jul 2016
309. Best Time to Buy and Sell Stock with Cooldown 17 Jul 2016
312. Burst Balloons 17 Jul 2016
321. Create Maximum Number 18 Jul 2016
322. Coin Change 18 Jul 2016
338. Counting Bits 18 Jul 2016
343. Integer Break 18 Jul 2016

Backtracking

10. Regular Expression Matching 23 Jun 2016
17. Letter Combinations of A Phone Number 25 Jun 2016
37. Sudoku Solver 25 Jun 2016
22. Generate Parentheses 26 Jun 2016
39. Combination Sum 26 Jun 2016
40. Combination Sum II 26 Jun 2016
44. Wildcard Matching 26 Jun 2016
46. Permutations 26 Jun 2016
47. Permutations II 27 Jun 2016
51. N-Queens 27 Jun 2016
52. N-Queens 27 Jun 2016
60. Permutation Sequence 28 Jun 2016
77. Combinations 28 Jun 2016
78. Subsets 28 Jun 2016
79. Word Search 28 Jun 2016
89. Gray Code 07 Jul 2016
90. Subsets II 07 Jul 2016
93. Restore IP Addresses 07 Jul 2016
126. Word Ladder II 13 Jul 2016
131. Palindrome Partition 13 Jul 2016
140. Word Break II 13 Jul 2016
211. Add and Search Word - Data structure design 16 Jul 2016
216. Combination Sum III 16 Jul 2016

Divide and Conquer

4. Median of Two Sorted Arrays 24 Jun 2016
23. Merge K Sorted Lists 26 Jun 2016
53. Maximum Subarray 27 Jun 2016
169. Majority Element 16 Jul 2016
215. Kth Largest Element in an Array 16 Jul 2016
240. Search a 2D Matrix II 16 Jul 2016
241. Different Ways to Add Parentheses 16 Jul 2016
282. Expression Add Operators 17 Jul 2016
312. Burst Balloons 17 Jul 2016
218. The Sky Line Problem 25 Jul 2016

Binary Search

4. Median of Two Sorted Arrays 24 Jun 2016
29. Divide Two Integers 26 Jun 2016
33. Search in Rotated Sorted Array 26 Jun 2016
34. Search for A Range 26 Jun 2016
35. Search Insert Position 26 Jun 2016
50. Pow(x, n) 27 Jun 2016
69. Sqrt(x) 28 Jun 2016
74. Search A 2D Matrix 28 Jun 2016
81. Search in Rotated Sorted Array II 28 Jun 2016
153. Find Minimum in Rotated Sorted Array 15 Jul 2016
154. Find Minimum in Rotated Sorted Array II 15 Jul 2016
162. Find Peek Element 15 Jul 2016
209. Minimum Size Subarray Sum 16 Jul 2016
222. Count Complete Tree Nodes 16 Jul 2016
240. Search a 2D Matrix II 16 Jul 2016
275. H-Index II 17 Jul 2016
278. First Bad Version 17 Jul 2016
287. Find the Duplicate Number 17 Jul 2016
300. Longest Increasing Subsequence 17 Jul 2016
349. Intersection of Two Arrays 18 Jul 2016
350. Intersection of Two Arrays II 18 Jul 2016

Stack

20. Valid Parentheses 25 Jun 2016
42. Trapping Rain Water 26 Jun 2016
71. Simplify Path 28 Jun 2016
84. Largest Rectangle in Histogram 28 Jun 2016
85. Maximal Rectangle 28 Jun 2016
94. Binary Tree Inorder Traversal 07 Jul 2016
103. Binary Tree Zigzag Level Order Traversal 11 Jul 2016
144. Binary Tree Preorder Traversal 13 Jul 2016
145. Binary Tree Postorder Traversal 13 Jul 2016
150. Evaluate Reverse Polish Notation 15 Jul 2016
155. Min Stack 15 Jul 2016
173. Binary Search Tree Iterator 16 Jul 2016
224. Basic Calculator 16 Jul 2016
225. Implement Stack Using Queues 16 Jul 2016
232. Implement Queue using Stacks 16 Jul 2016
316. Remove Duplicate Letters 17 Jul 2016
331. Verify Preorder Serialization of a Binary Tree 18 Jul 2016
341. Flatten Nested List Iterator 18 Jul 2016

Heap

23. Merge K Sorted Lists 26 Jun 2016
215. Kth Largest Element in an Array 16 Jul 2016
264. Ugly Number II 17 Jul 2016
295. Find Median from Data Stream 17 Jul 2016
313. Super Ugly Number 17 Jul 2016
347. Top K Frequent Elements 18 Jul 2016
218. The Sky Line Problem 25 Jul 2016

Greedy

44. Wildcard Matching 26 Jun 2016
45. Jump Game II 26 Jun 2016
55. Jump Game 27 Jun 2016
122. Best Time to Buy and Sell Stock II 11 Jul 2016
134. Gas Station 13 Jul 2016
135. Candy 13 Jul 2016
316. Remove Duplicate Letters 17 Jul 2016
321. Create Maximum Number 18 Jul 2016
330. Patching Array 18 Jul 2016

Sort

56. Merge Intervals 27 Jun 2016
57. Insert Interval 27 Jun 2016
75. Sort Colors 28 Jun 2016
147. Insertion Sort List 15 Jul 2016
148. Sort List 15 Jul 2016
164. Maximum Gap 15 Jul 2016
179. Largest Number 16 Jul 2016
242. Valid Anagram 16 Jul 2016
274. H-Index 17 Jul 2016
324. Wiggle Sort II 18 Jul 2016
349. Intersection of Two Arrays 18 Jul 2016
350. Intersection of Two Arrays II 18 Jul 2016

Graph

Depth First Search

133. Clone Graph 28 Jun 2016
100. Same Tree 11 Jul 2016
101. Symmetric Tree 11 Jul 2016
104. Maximum Depth of Binary Tree 11 Jul 2016
105. Construct Binary Tree from Preorder and Inorder Traversal 11 Jul 2016
106. Construct Binary Tree from Inorder and Postorder traversal 11 Jul 2016
108. Convert Sorted Array to Binary Search Tree 11 Jul 2016
109. Convert Sorted List to Binary Search Tree 11 Jul 2016
110. Balanced Binary Tree 11 Jul 2016
111. Minimum Depth of Binary Tree 11 Jul 2016
112. Path Sum 11 Jul 2016
113. Path Sum II 11 Jul 2016
114. Flatten Binary Tree to Linked List 11 Jul 2016
116. Populating Next Right Pointers in Each Node 11 Jul 2016
117. Populating Next Right Pointers in Each Node II 11 Jul 2016
124. Binary Tree Maximum Path Sum 11 Jul 2016
98. Validate Binary Search Tree 11 Jul 2016
99. Recover Binary Search Tree 11 Jul 2016
129. Sum Root to Leaf Numbers 13 Jul 2016
199. Binary Tree Right Side View 16 Jul 2016
200. Number of Islands 16 Jul 2016
207. Course Schedule 16 Jul 2016
210. Course Schedule II 16 Jul 2016
257. Binary Tree Paths 16 Jul 2016
306. Additive Number 17 Jul 2016
329. Longest Increasing Path in a Matrix 18 Jul 2016
332. Reconstruct Itinerary 18 Jul 2016
337. House Robber III 18 Jul 2016

Breadth First Search

133. Clone Graph 28 Jun 2016
101. Symmetric Tree 11 Jul 2016
102. Binary Tree Level Order Traversal 11 Jul 2016
103. Binary Tree Zigzag Level Order Traversal 11 Jul 2016
107. Binary Tree Level Order Traversal II 11 Jul 2016
111. Minimum Depth of Binary Tree 11 Jul 2016
126. Word Ladder II 13 Jul 2016
127. Word Ladder 13 Jul 2016
130. Surrounded Regions 13 Jul 2016
199. Binary Tree Right Side View 16 Jul 2016
200. Number of Islands 16 Jul 2016
207. Course Schedule 16 Jul 2016
210. Course Schedule II 16 Jul 2016
279. Perfect Squares 17 Jul 2016
310. Minimum Height Trees 17 Jul 2016

Bit Manipulation

78. Subsets 28 Jun 2016
136. Single Number 13 Jul 2016
137. Single Number II 13 Jul 2016
169. Majority Element 16 Jul 2016
187. Repeated DNA Sequences 16 Jul 2016
190. Reverse Bits 16 Jul 2016
191. Number of 1 Bits 16 Jul 2016
201. Bitwise AND of Numbers Range 16 Jul 2016
231. Power of Two 16 Jul 2016
260. Single Number III 16 Jul 2016
268. Missing Number 17 Jul 2016
318. Maximum Product of Word Lengths 17 Jul 2016
338. Counting Bits 18 Jul 2016
342. Power of Four 18 Jul 2016

Tree

94. Binary Tree Inorder Traversal 07 Jul 2016
95. Unique Binary Search Tree II 07 Jul 2016
100. Same Tree 11 Jul 2016
101. Symmetric Tree 11 Jul 2016
102. Binary Tree Level Order Traversal 11 Jul 2016
103. Binary Tree Zigzag Level Order Traversal 11 Jul 2016
104. Maximum Depth of Binary Tree 11 Jul 2016
105. Construct Binary Tree from Preorder and Inorder Traversal 11 Jul 2016
106. Construct Binary Tree from Inorder and Postorder traversal 11 Jul 2016
107. Binary Tree Level Order Traversal II 11 Jul 2016
108. Convert Sorted Array to Binary Search Tree 11 Jul 2016
110. Balanced Binary Tree 11 Jul 2016
111. Minimum Depth of Binary Tree 11 Jul 2016
112. Path Sum 11 Jul 2016
113. Path Sum II 11 Jul 2016
114. Flatten Binary Tree to Linked List 11 Jul 2016
116. Populating Next Right Pointers in Each Node 11 Jul 2016
117. Populating Next Right Pointers in Each Node II 11 Jul 2016
124. Binary Tree Maximum Path Sum 11 Jul 2016
96. Unique Binary Search Trees 11 Jul 2016
98. Validate Binary Search Tree 11 Jul 2016
99. Recover Binary Search Tree 11 Jul 2016
129. Sum Root to Leaf Numbers 13 Jul 2016
144. Binary Tree Preorder Traversal 13 Jul 2016
145. Binary Tree Postorder Traversal 13 Jul 2016
173. Binary Search Tree Iterator 16 Jul 2016
199. Binary Tree Right Side View 16 Jul 2016
222. Count Complete Tree Nodes 16 Jul 2016
226. Invert Binary Tree 16 Jul 2016
235. Lowest Common Ancestor of a Binary Search Tree 16 Jul 2016
236. Lowest Common Ancestor of a Binary Tree 16 Jul 2016
257. Binary Tree Paths 16 Jul 2016
297. Serialize And Deserialize Binary Tree 17 Jul 2016
331. Verify Preorder Serialization of a Binary Tree 18 Jul 2016
337. House Robber III 18 Jul 2016

Union Find

128. Longest Consecutive Sequence 13 Jul 2016
130. Surrounded Regions 13 Jul 2016
200. Number of Islands 16 Jul 2016

Design

146. LRU Cache 15 Jul 2016
155. Min Stack 15 Jul 2016
173. Binary Search Tree Iterator 16 Jul 2016
208. Implement Trie (Prefix Tree) 16 Jul 2016
211. Add and Search Word - Data structure design 16 Jul 2016
225. Implement Stack Using Queues 16 Jul 2016
232. Implement Queue using Stacks 16 Jul 2016
284. Peeking Iterator 17 Jul 2016
295. Find Median from Data Stream 17 Jul 2016
297. Serialize And Deserialize Binary Tree 17 Jul 2016
341. Flatten Nested List Iterator 18 Jul 2016

Topological Sort

207. Course Schedule 16 Jul 2016
210. Course Schedule II 16 Jul 2016
329. Longest Increasing Path in a Matrix 18 Jul 2016

Trie

208. Implement Trie (Prefix Tree) 16 Jul 2016
211. Add and Search Word - Data structure design 16 Jul 2016

Binary Search Tree

220. Contains Duplicate III 16 Jul 2016

Brainteaser

292. Nim Game 17 Jul 2016
319. Bulb Switcher 17 Jul 2016

Segment Tree

307. Range Sum Query - Mutable 17 Jul 2016
218. The Sky Line Problem 25 Jul 2016

Binary Index Tree

307. Range Sum Query - Mutable 17 Jul 2016

Memoization

329. Longest Increasing Path in a Matrix 18 Jul 2016

Binary Indexed Tree

218. The Sky Line Problem 25 Jul 2016