Array
-
88. Merge Sorted Array
-
1089. Duplicate Zeros
-
941. Valid Mountain Array
-
1710. Maximum Units on a Truck
-
54. Spiral Matrix
Backtrack
Binary Search
-
33. Search in Rotated Sorted Array
-
81. Search in Rotated Sorted Array II
-
153. Find Minimum in Rotated Sorted Array
-
154. Find Minimum in Rotated Sorted Array II
-
374. Guess Number Higher or Lower
Bit Manipulation
-
136. Single Number
-
191. Number of 1 Bits
-
7. Reverse Integer
-
504. Base 7
-
405. Convert a Number to Hexadecimal
Classic
Design
-
295. Find Median from Data Stream
-
449. Serialize and Deserialize BST
-
707. Design Linked List
-
703. Kth Largest Element in a Stream
-
1046. Last Stone Weight
Dynamic Programming
Graph
-
547. Number of Provinces
-
286. Walls and Gates
-
261. Graph Valid Tree
-
797. All Paths From Source to Target
-
1101. The Earliest Moment When Everyone Become Friends
Hash Table
-
219. Contains Duplicate II
-
220. Contains Duplicate III
-
1170. Compare Strings by Frequency of the Smallest Character
-
49. Group Anagrams
-
560. Subarray Sum Equals K
Heap
-
347. Top K Frequent Elements
-
128. Longest Consecutive Sequence
-
973. K Closest Points to Origin
-
1167. Minimum Cost to Connect Sticks
-
692. Top K Frequent Words
Inorder Traversal
-
426. Convert Binary Search Tree to Sorted Doubly Linked List
-
230. Kth Smallest Element in a BST
-
94. Binary Tree Inorder Traversal
Intervals
-
252. Meeting Rooms
-
56. Merge Intervals
-
57. Insert Interval
-
253. Meeting Rooms II
-
986. Interval List Intersections
LeetCode
-
88. Merge Sorted Array
-
1089. Duplicate Zeros
-
941. Valid Mountain Array
-
1710. Maximum Units on a Truck
-
54. Spiral Matrix
Linked List
-
23. Merge k Sorted Lists
-
148. Sort List
-
92. Reverse Linked List II
-
876. Middle of the Linked List
-
147. Insertion Sort List
Math
-
1492. The kth Factor of n
-
829. Consecutive Numbers Sum
-
204. Count Primes
-
553. Optimal Division
-
372. Super Pow
Meta
Object Oriented Design
-
710. Random Pick with Blacklist
-
348. Design Tic-Tac-Toe
-
380. Insert Delete GetRandom O(1)
-
271. Encode and Decode Strings
Other
-
1446. Consecutive Characters
-
31. Next Permutation
-
386. Lexicographical Numbers
-
48. Rotate Image
-
158. Read N Characters Given Read4 II - Call multiple times
Postorder Traversal
-
337. House Robber III
-
145. Binary Tree Postorder Traversal
-
114. Flatten Binary Tree to Linked List
-
652. Find Duplicate Subtrees
-
543. Diameter of Binary Tree
Prefix Sum
-
238. Product of Array Except Self
-
303. Range Sum Query - Immutable
-
304. Range Sum Query 2D - Immutable
-
1314. Matrix Block Sum
-
525. Contiguous Array
Preorder Traversal
-
105. Construct Binary Tree from Preorder and Inorder Traversal
-
589. N-ary Tree Preorder Traversal
-
255. Verify Preorder Sequence in Binary Search Tree
-
144. Binary Tree Preorder Traversal
-
872. Leaf-Similar Trees
Recursion
Sliding Window
-
862. Shortest Subarray with Sum at Least K
-
1004. Max Consecutive Ones III
-
904. Fruit Into Baskets
-
930. Binary Subarrays With Sum
-
713. Subarray Product Less Than K
Sorting
-
912. Sort an Array
-
75. Sort Colors
-
1051. Height Checker
-
147. Insertion Sort List
-
215. Kth Largest Element in an Array
Stack
-
394. Decode String
-
20. Valid Parentheses
-
84. Largest Rectangle in Histogram
-
155. Min Stack
-
316. Remove Duplicate Letters
String
-
12. Integer to Roman
-
8. String to Integer atoi
-
344. Reverse String
-
43. Multiply Strings
-
696. Count Binary Substrings
Tree
-
536. Construct Binary Tree from String
-
337. House Robber III
-
105. Construct Binary Tree from Preorder and Inorder Traversal
-
606. Construct String from Binary Tree
-
589. N-ary Tree Preorder Traversal
Trie
-
208. Implement Trie Prefix Tree
-
1268. Search Suggestions System
-
642. Design Search Autocomplete System
-
211. Design Add and Search Words Data Structure
-
648. Replace Words
Two Pointers
-
977. Squares of a Sorted Array
-
1358. Number of Substrings Containing All Three Characters
-
1234. Replace the Substring for Balanced String
-
159. Longest Substring with At Most Two Distinct Characters
-
567. Permutation in String