Content

Exercises

stringsarrayslinked listtreeeasymediumhardstackqueuegraphhash tablerecursionheapbinary searchbinary treetrien-ary treebinary search treebit manipulationdynamic programming

	1. Square a Number
	2. Check If Positive
	3. Minimum of Two Numbers
	4. Add Two Numbers
	5. Join Array Elements
	6. Check If Even
	7. Sum Array Elements
	8. Check Range
	9. Maximum Array Element
	10. Power
	11. Count Even Elements
	12. Find Element Index
	13. Reverse Array
	14. Maximum of Two Numbers
	15. Check If Odd
	16. Number Sign
	17. Age Category
	18. Count Ones
	19. Max Consecutive Ones
	20. Sorted Squares
	21. Duplicate Zeros
	22. Merge Sorted Array
	23. Remove Element
	24. Remove Duplicates from Sorted Array
	25. Check If Double Exists
	26. Valid Mountain Array
	27. Replace Elements with Greatest on Right
	28. Move Zeroes
	29. Height Checker
	30. Third Maximum Number
	31. Pivot Index
	32. Plus One
	33. Rotate Array
	34. Two Sum
	35. Minimum Size Subarray Sum
	36. Reverse Linked List
	37. Populating Next Right Pointers
	38. Daily Temperatures
	39. Valid Parentheses
	40. Evaluate Reverse Polish Notation
	41. Decode String
	42. Open the Lock
	43. Perfect Squares
	44. Binary Tree Inorder Traversal
	45. Number of Islands
	46. Flood Fill
	47. 01 Matrix
	48. Keys and Rooms
	49. Palindrome Linked List
	50. Merge Two Sorted Lists
	51. Remove Nth Node From End of List
	52. Odd Even Linked List
	53. Rotate List
	54. Remove Duplicates From Sorted List
	55. Remove Duplicates From Sorted List II
	56. Add Two Numbers
	57. Remove Linked List Elements
	58. Contains Duplicate
	59. Single Number
	60. Intersection of Two Arrays
	61. Intersection of Two Arrays II
	62. Contains Nearby Duplicate
	63. Isomorphic Strings
	64. Minimum Index Sum of Two Lists
	65. First Unique Character in a String
	66. Happy Number
	67. 4Sum II
	68. Top K Frequent Elements
	69. Longest Substring Without Repeating Characters
	70. Jewels and Stones
	71. Valid Sudoku
	72. Dominant Index
	73. Spiral Matrix
	74. Pascal's Triangle
	75. Diagonal Traverse
	76. Add Binary
	77. Implement strStr()
	78. Longest Common Prefix
	79. Reverse String
	80. Reverse Words in a String
	81. Reverse Words in a String III
	82. Pascal's Triangle II
	83. Swap Nodes in Pairs
	84. Fibonacci Number
	85. Climbing Stairs
	86. Maximum Depth of Binary Tree
	87. Pow(x, n)
	88. Search in a Binary Search Tree
	89. K-th Symbol in Grammar
	90. Unique Binary Search Trees II
	91. Combinations
	92. N-Queens
	93. Sudoku Solver
	94. Largest Rectangle in Histogram
	95. Letter Combinations of a Phone Number
	96. The Skyline Problem
	97. Permutations
	98. Sort an Array
	99. Search a 2D Matrix II
	100. Same Tree
	101. Generate Parentheses
	102. Minimum Cost to Connect Sticks
	103. Kth Largest Element in an Array
	104. Furthest Building You Can Reach
	105. The K Weakest Rows in a Matrix
	106. Last Stone Weight
	107. K Closest Points to Origin
	108. Meeting Rooms II
	109. Kth Smallest Element in a Sorted Matrix
	110. Binary Search
	111. Search in Rotated Sorted Array
	112. Sqrt(x)
	113. Find Minimum in Rotated Sorted Array
	114. Find Minimum in Rotated Sorted Array II
	115. Find Peak Element
	116. Find First and Last Position of Element in Sorted Array
	117. Find K Closest Elements
	118. Find the Duplicate Number
	119. Split Array Largest Sum
	120. Find K-th Smallest Pair Distance
	121. Median of Two Sorted Arrays
	122. Find Smallest Letter Greater Than Target
	123. Valid Perfect Square
	124. Binary Tree Preorder Traversal
	125. Binary Tree Postorder Traversal
	126. Binary Tree Level Order Traversal
	127. Symmetric Tree
	128. Path Sum
	129. Construct Binary Tree from Inorder and Postorder Traversal
	130. Construct Binary Tree from Preorder and Inorder Traversal
	131. Populating Next Right Pointers in Each Node II
	132. Lowest Common Ancestor of a Binary Tree
	133. Replace Words
	134. Word Search II
	135. Palindrome Pairs
	136. Maximum XOR of Two Numbers in an Array
	137. N-ary Tree Level Order Traversal
	138. N-ary Tree Preorder Traversal
	139. N-Ary Tree Postorder Traversal
	140. Maximum Depth of N-Ary Tree
	141. Validate Binary Search Tree
	142. Convert Sorted Array to BST
	143. Balanced Binary Tree
	144. Insert Into a Binary Search Tree
	145. Delete Node in a BST
	146. Contains Duplicate III
	147. Lowest Common Ancestor of a BST
	148. All Paths From Source to Target
	149. Rotting Oranges
	150. Shortest Path in Binary Matrix
	151. Reconstruct Itinerary
	152. Leads to Destination
	153. Evaluate Division
	154. Number of Connected Components
	155. Earliest Moment When Everyone Become Friends
	156. Number of Provinces
	157. Optimize Water Distribution
	158. Smallest String With Swaps
	159. Graph Valid Tree
	160. Alien Dictionary
	161. Minimum Height Trees
	162. Course Schedule II
	163. Parallel Courses
	164. Min Cost to Connect All Points
	165. Cheapest Flights Within K Stops
	166. Path With Minimum Effort
	167. Network Delay Time
	168. Hamming Weight
	169. Counting Bits
	170. Reverse Bits
	171. Sum of Two Integers
	172. Single Number II
	173. Single Number III
	174. Bitwise AND of Numbers Range
	175. Gray Code
	176. Convert to Base 7
	177. Convert a Number to Hexadecimal
	178. Max Students Taking Exam
	179. Min Cost Climbing Stairs
	180. N-Th Tribonacci Number
	181. House Robber
	182. Delete and Earn
	183. Longest Common Subsequence
	184. Maximal Square
	185. Maximum Score From Multiplying