Question Sort By Topic

Array

Question Number	Question	Level	Topic	Date
1450	Number of Students Doing Homework at a Given Time	Easy	Array	2020-05-16
1464	Maximum Product of Two Elements in an Array	Easy	Array	2020-05-31
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Medium	Array	2020-05-31
1470	Shuffle the Array	Easy	Array	2020-06-06
1471	The k Strongest Values in an Array	Medium	Array	2020-06-06
918	Maximum Sum Circular Subarray	Medium	Array	2020-05-15

Backtracking

Question Number	Question	Level	Topic	Date
39	Combination Sum	Medium	Backtracking	2020-10-04
46	Permutations	Medium	Backtracking	2021-04-29

Binary Search

Question Number	Question	Level	Topic	Date
230	Kth Smallest Element in a BST	Medium	Binary Search	2020-05-20
4	Median of Two Sorted Arrays	Hard	Binary Search	2021-01-23
528	Random Pick with Weight	Medium	Binary Search	2020-06-05
540	Single Element in a Sorted Array	Medium	Binary Search	2020-05-12
704	Binary Search	Easy	Binary Search	2020-10-08

Bit Manipulation

Question Number	Question	Level	Topic	Date
1009	Complement of Base 10 Integer	Easy	Bit Manipulation	2020-10-05
1290	Convert Binary Number in a Linked List to Integer	Easy	Bit Manipulation	2020-11-01
136	Single Number	Easy	Bit Manipulation	2020-05-29
137	Single Number II	Medium	Bit Manipulation	2020-05-29
190	Reverse Bits	Easy	Bit Manipulation	2020-05-28
191	Number of 1 Bits	Easy	Bit Manipulation	2020-05-28
231	Power of Two	Easy	Bit Manipulation	2020-05-28
260	Single Number III	Medium	Bit Manipulation	2020-05-30
338	Counting Bits	Medium	Bit Manipulation	2020-05-28
476	Number Complement	Easy	Bit Manipulation	2020-10-03

DP

Question Number	Question	Level	Topic	Date
1035	Uncrossed Lines	Medium	DP	2020-05-25
1143	Longest Common Subsequence	Medium	DP	2020-05-25
121	Best Time to Buy and Sell Stock	Easy	DP	2020-05-16
1277	Count Square Submatrices with All Ones	Medium	DP	2020-05-21
1458	Max Dot Product of Two Subsequences	Hard	DP	2020-05-23
198	House Robber	Easy	DP	2020-09-29
213	House Robber II	Medium	DP	2020-10-14
221	Maximal Square	Medium	DP	2020-05-21
5	Longest Palindromic Substring	Medium	DP	2021-01-24
518	Coin Change 2	Medium	DP	2020-06-07
53	Maximum Subarray	Easy	DP	2020-05-15
72	Edit Distance	Hard	DP	2020-05-31

Design

Question Number	Question	Level	Topic	Date
1472	Design Browser History	Medium	Design	2020-06-06

Graph

Question Number	Question	Level	Topic	Date
785	Is Graph Bipartite?	Medium	Graph	2020-05-27
886	Possible Bipartition	Medium	Graph	2020-05-27

Greedy

Question Number	Question	Level	Topic	Date
1029	Two City Scheduling	Easy	Greedy	2020-06-03
1081	Smallest Subsequence of Distinct Characters	Medium	Greedy	2020-10-10
1616	Split Two Strings to Make Palindrome	Medium	Greedy	2020-10-13
252	Meeting Rooms	Easy	Greedy	2020-10-31
253	Meeting Rooms II	Medium	Greedy	2020-10-30
316	Remove Duplicate Letters	Medium	Greedy	2020-10-09
406	Queue Reconstruction by Height	Medium	Greedy	2020-06-06
452	Minimum Number of Arrows to Burst Balloons	Medium	Greedy	2020-10-01

Hash Table

Question Number	Question	Level	Topic	Date
1	Two Sum	Easy	Hash Table	2021-01-20
170	Two Sum III - Data structure design	Easy	Hash Table	2020-10-02
266	Palindrome Permutation	Easy	Hash Table	2020-05-24
325	Maximum Size Subarray Sum Equals k	Medium	Hash Table	2020-05-26
438	Find All Anagrams in a String	Medium	Hash Table	2020-05-17
451	Sort Characters By Frequency	Medium	Hash Table	2020-05-22
525	Contiguous Array	Medium	Hash Table	2020-05-26
567	Permutation in String	Medium	Hash Table	2020-05-18

Linked List

Question Number	Question	Level	Topic	Date
148	Sort List	Medium	Linked List	2020-09-30
2	Add Two Numbers	Medium	Linked List	2021-01-21
21	Merge Two Sorted Lists	Easy	Linked List	2020-10-13
237	Delete Node in a Linked List	Easy	Linked List	2020-06-02
328	Odd Even Linked List	Medium	Linked List	2020-05-16
61	Rotate List	Medium	Linked List	2020-10-07

Math

Question Number	Question	Level	Topic	Date
949	Largest Time for Given Digits	Easy	Math	2020-09-01

Sliding Window

Question Number	Question	Level	Topic	Date
1456	Maximum Number of Vowels in a Substring of Given Length	Medium	Sliding Window	2020-05-23

Sort

Question Number	Question	Level	Topic	Date
973	K Closest Points to Origin	Medium	Sort	2020-05-30

Stack

Question Number	Question	Level	Topic	Date
402	Remove K Digits	Medium	Stack	2020-05-13
901	Online Stock Span	Medium	Stack	2020-05-19

String

Question Number	Question	Level	Topic	Date
1451	Rearrange Words in a Sentence	Medium	String	2020-05-16
1452	People Whose List of Favorite Companies Is Not a Subset of Another List	Medium	String	2020-05-16
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy	String	2020-05-23
859	Buddy Strings	Easy	String	2020-10-12

Topological Sort

Question Number	Question	Level	Topic	Date
207	Course Schedule	Medium	Topological Sort	2020-05-29

Tree

Question Number	Question	Level	Topic	Date
1008	Construct Binary Search Tree from Preorder Traversal	Medium	Tree	2020-05-24
1457	Pseudo-Palindromic Paths in a Binary Tree	Medium	Tree	2020-05-23
1466	Reorder Routes to Make All Paths Lead to the City Zero	Medium	Tree	2020-05-31
226	Invert Binary Tree	Easy	Tree	2020-06-01
449	Serialize and Deserialize BST	Medium	Tree	2020-10-11
701	Insert into a Binary Search Tree	Medium	Tree	2020-10-06
965	Univalued Binary Tree	Easy	Tree	2020-06-02

Trie

Question Number	Question	Level	Topic	Date
208	Implement Trie (Prefix Tree)	Medium	Trie	2020-05-14

Two Pointers

Question Number	Question	Level	Topic	Date
3	Longest Substring Without Repeating Characters	Medium	Two Pointers	2021-01-22
344	Reverse String	Easy	Two Pointers	2020-06-04
986	Interval List Intersections	Medium	Two Pointers	2020-05-23