Problem Sequence

 

1. Contains Duplicate

2. Missing Number

3. Find All Numbers Disappeared in an Array

4. Single Number

5. Climbing Stairs

6. House Robber

7. Best Time to Buy and Sell Stock

8. Maximum Subarray

9. Range Sum Query - Immutable

10. Linked List Cycle

11. Middle of the Linked List

12. Palindrome Linked List

13. Remove Linked List Elements

14. Remove Duplicates from Sorted List

15. Reverse Linked List

16. Merge Two Sorted Lists

17. Meeting Rooms

18. Binary Search

19. Find Smallest Letter Greater Than Target

20. Peak Index in a Mountain Array

21. Binary Tree Level Order Traversal II

22. Average of Levels in Binary Tree

23. Minimum Depth of Binary Tree

24. Same Tree

25. Path Sum

26. Diameter of Binary Tree

27. Merge Two Binary Trees

28. Maximum Depth of Binary Tree

29. Lowest Common Ancestor of a Binary Search Tree

30. Subtree of Another Tree

31. Invert Binary Tree

32. Two Sum

33. Squares of a Sorted Array

34. Backspace String Compare

35. Longest Word in Dictionary

36. Index Pairs of a String

37. Majority Element

38. Product of Array Except Self

39. Find the Duplicate Number

40. Find All Duplicates in an Array

41. Set Matrix Zeroes

42. Spiral Matrix

43. Rotate Image

44. Word Search

45. Letter Case Permutation 46. Subsets
47. Subsets II
48. Permutations

49. Permutations II
50. Combinations
51. Combination Sum
52. Combination Sum II 53. Combination Sum III 54. Generate Parentheses 55. Target Sum

56. Palindrome Partitioning
57. Letter Combinations of a Phone Number
58. Generalized Abbreviation
59. House Robber II
60. Coin Change
61. Maximum Product Subarray
62. Longest Increasing Subsequence
63. Longest Palindromic Substring
64. Word Break
65. Combination Sum IV
66. Decode Ways
67. Unique Paths
68. Jump Game
69. Palindromic Substrings
70. Number of Longest Increasing Subsequence
71. Partition Equal Subset Sum
72. Partition to K Equal Sum Subsets
73. Best Time to Buy and Sell Stock with Cooldown
74. Counting Bits
75. Linked List Cycle II
76. Add Two Numbers
77. Remove Nth Node From End Of List
78. Sort List
79. Reorder List
80. Clone Graph
81. Pacific Atlantic Water Flow
82. Number of Islands
83. Graph Valid Tree
84. Number of Connected Components in an Undirected Graph 85. Reverse Linked List II
86. Rotate List
87. Swap Nodes in Pairs
88. Odd Even Linked List

89. Kth Smallest Element in a Sorted Matrix 90. Find K Pairs with Smallest Sums
91. Merge Intervals
92. Interval List Intersections

93. Non-overlapping Intervals
94. Meeting Rooms II
95. Task Scheduler
96. Minimum Number of Arrows to Burst Balloons 97. Find Minimum in Rotated Sorted Array

98. Find Peak Element
99. Search in Rotated Sorted Array

100. Search in Rotated Sorted Array II

101. Search a 2D Matrix

102. Search a 2D Matrix II

103. Find K Closest Elements

104. Minimum Size Subarray Sum

105. Fruit Into Baskets

106. Permutation in String

107. Longest Repeating Character Replacement

108. Kth Smallest Element in a BST

109. K Closest Points to Origin

110. Top K Frequent Elements

111. Sort Characters By Frequency

112. Kth Largest Element in an Array

113. Reorganize String

114. Course Schedule

115. Course Schedule II

116. Minimum Height Trees

117. Binary Tree Level Order Traversal

118. Binary Tree Zigzag Level Order Traversal

119. Populating Next Right Pointers in Each Node

120. Populating Next Right Pointers in Each Node II

121. Binary Tree Right Side View

122. All Nodes Distance K in Binary Tree

123. Path Sum II

124. Path Sum III

125. Lowest Common Ancestor of a Binary Tree

126. Maximum Binary Tree

127. Maximum Width of Binary Tree

128. Construct Binary Tree from Preorder and Inorder Traversal

129. Validate Binary Search Tree

130. Implement Trie (Prefix Tree)

131. 3 Sum

132. 3 Sum Closest

133. Subarrays with Product Less than K

134. Sort Colours

135. Maximum XOR of Two Numbers in an Array

136. First Missing Positive

137. Longest Consecutive Sequence

138. Sudoku Solver

139. N-Queens

140. Reverse Nodes in k-Group

141. Merge k Sorted Lists

142. Smallest Range Covering Elements from K Lists

143. Insert Interval

144. Employee Free Time

145. Count of Range Sum

146. Sliding Window Maximum

147. Longest Substring Without Repeating Characters

148. Minimum Number of K Consecutive Bit Flips

149. Count Unique Characters of All Substrings of a Given String

150. Minimum Window Substring

151. Substring with Concatenation of All Words

152. Rearrange String k Distance Apart

153. Course Schedule III

154. Maximum Frequency Stack

155. Alien Dictionary

156. Sequence Reconstruction

157. Binary Tree Maximum Path Sum

158. Serialize and Deserialize Binary Tree

159. Word Search II

160. Find Median from Data Stream

161. Sliding Window Median

162. Trapping Rain Water

163. Container With Most Water

164. Concatenated Words

165. Prefix and Suffix Search

166. Palindrome Pairs

167. Design Search Autocomplete System

168. Word Squares

169. Sort Items by Groups Respecting Dependencies

170. Median of Two Sorted Arrays