DSA & Coding Problems Explorer

All C# Programs — Data Structures 167 C# Programs — Strings 105 C# Programs — Arrays 105 DSA — Stacks & Queues 105 DSA — Arrays 105 DSA — Graphs 105 DSA — Hashing 105 DSA — Binary Search 105 DSA — Trees 105 DSA — Dynamic Programming 105 DSA — Sorting 105 DSA — Two Pointers 105 DSA — Strings 105 C# Programs — LINQ 104 C# Programs — Collections 103 C# Programs — OOP 103 C# Programs — Sorting 103 C# Programs — Inheritance 101 SQL Server — DDL & constraints 101 SQL Server — JOINs 101 SQL Server — T-SQL procedures 101 SQL Server — SELECT basics 101 SQL Server — WHERE & filtering 101 SQL Server — Indexes & plans 101 SQL Server — Subqueries 101 SQL Server — Aggregates & GROUP BY 101 C# Programs — Interfaces 101 SQL Server — Window functions 101

8773 problems

#	Title	Topics	Acceptance	Pts	Difficulty
5151	T-SQL subquery above average #17	SQL Server — Subqueries sqlserver coding-practice	—	40	Hard	Solve
5152	Valid parentheses depth #17	DSA — Stacks & Queues dsa coding-practice	—	20	Easy	Solve
5153	Above average #18	SQL — Subqueries sql coding-practice	—	30	Medium	Solve
5154	Count vowels in "developer" #18	C# Programs — Strings csharp coding-practice	—	20	Easy	Solve
5155	Map squares #18	JavaScript — Objects javascript coding-practice	—	30	Medium	Solve
5156	Map squares #18	React — useEffect react coding-practice	—	30	Medium	Solve
5157	Map squares #18	Node.js — Express patterns nodejs coding-practice	—	30	Medium	Solve
5158	MongoDB relationships #18	MongoDB — Embedding vs referencing mongodb coding-practice	—	30	Medium	Solve
5159	MySQL subquery above avg #18	MySQL — Subqueries mysql coding-practice	—	30	Medium	Solve
5160	PostgreSQL CTE top earners #18	PostgreSQL — Subqueries & CTEs postgresql coding-practice	—	30	Medium	Solve
5161	Queue — simulate task scheduler #18	DSA — Stacks & Queues dsa coding-practice	—	30	Medium	Solve
5162	T-SQL subquery above average #18	SQL Server — Subqueries sqlserver coding-practice	—	30	Medium	Solve
5163	Above average #19	SQL — Subqueries sql coding-practice	—	40	Hard	Solve
5164	Max in set #19	JavaScript — Objects javascript coding-practice	—	20	Easy	Solve
5165	Max in set #19	React — useEffect react coding-practice	—	20	Easy	Solve
5166	Max in set #19	Node.js — Express patterns nodejs coding-practice	—	20	Easy	Solve
5167	MongoDB relationships #19	MongoDB — Embedding vs referencing mongodb coding-practice	—	30	Medium	Solve
5168	MySQL subquery above avg #19	MySQL — Subqueries mysql coding-practice	—	40	Hard	Solve
5169	PostgreSQL CTE top earners #19	PostgreSQL — Subqueries & CTEs postgresql coding-practice	—	40	Hard	Solve
5170	T-SQL subquery above average #19	SQL Server — Subqueries sqlserver coding-practice	—	20	Easy	Solve
5171	Uppercase "code" #19	C# Programs — Strings csharp coding-practice	—	20	Easy	Solve
5172	Valid parentheses depth #19	DSA — Stacks & Queues dsa coding-practice	—	20	Easy	Solve
5173	Above average #20	SQL — Subqueries sql coding-practice	—	30	Medium	Solve
5174	MongoDB relationships #20	MongoDB — Embedding vs referencing mongodb coding-practice	—	30	Medium	Solve
5175	MySQL subquery above avg #20	MySQL — Subqueries mysql coding-practice	—	30	Medium	Solve
5176	PostgreSQL CTE top earners #20	PostgreSQL — Subqueries & CTEs postgresql coding-practice	—	30	Medium	Solve
5177	Queue — simulate task scheduler #20	DSA — Stacks & Queues dsa coding-practice	—	30	Medium	Solve
5178	Reduce product #20	JavaScript — Objects javascript coding-practice	—	30	Medium	Solve
5179	Reduce product #20	React — useEffect react coding-practice	—	30	Medium	Solve
5180	Reduce product #20	Node.js — Express patterns nodejs coding-practice	—	30	Medium	Solve
5181	String length manual "practice" #20	C# Programs — Strings csharp coding-practice	—	20	Easy	Solve
5182	T-SQL subquery above average #20	SQL Server — Subqueries sqlserver coding-practice	—	30	Medium	Solve
5183	Above average #21	SQL — Subqueries sql coding-practice	—	30	Medium	Solve
5184	MongoDB relationships #21	MongoDB — Embedding vs referencing mongodb coding-practice	—	30	Medium	Solve
5185	MySQL subquery above avg #21	MySQL — Subqueries mysql coding-practice	—	30	Medium	Solve
5186	PostgreSQL CTE top earners #21	PostgreSQL — Subqueries & CTEs postgresql coding-practice	—	30	Medium	Solve
5187	Reverse "interview" #21	C# Programs — Strings csharp coding-practice	—	20	Easy	Solve
5188	Sum 1..10 #21	JavaScript — Objects javascript coding-practice	—	40	Hard	Solve
5189	Sum 1..10 #21	React — useEffect react coding-practice	—	40	Hard	Solve
5190	Sum 1..10 #21	Node.js — Express patterns nodejs coding-practice	—	40	Hard	Solve
5191	T-SQL subquery above average #21	SQL Server — Subqueries sqlserver coding-practice	—	40	Hard	Solve
5192	Valid parentheses depth #21	DSA — Stacks & Queues dsa coding-practice	—	20	Easy	Solve
5193	Above average #22	SQL — Subqueries sql coding-practice	—	40	Hard	Solve
5194	Count vowels in "csharp" #22	C# Programs — Strings csharp coding-practice	—	20	Easy	Solve
5195	Filter evens #22	JavaScript — Objects javascript coding-practice	—	30	Medium	Solve
5196	Filter evens #22	React — useEffect react coding-practice	—	30	Medium	Solve
5197	Filter evens #22	Node.js — Express patterns nodejs coding-practice	—	30	Medium	Solve
5198	MongoDB relationships #22	MongoDB — Embedding vs referencing mongodb coding-practice	—	30	Medium	Solve
5199	MySQL subquery above avg #22	MySQL — Subqueries mysql coding-practice	—	40	Hard	Solve
5200	PostgreSQL CTE top earners #22	PostgreSQL — Subqueries & CTEs postgresql coding-practice	—	40	Hard	Solve

Problem of the day

Combination Sum II

Medium · +15 pts

Solve today

Weekly leaderboard

View all

1 Pratik Chopade 1 solved

Company sheets

Toolliyo unique — practice by hiring company.

Google Amazon Microsoft Meta Apple Netflix TikTok LinkedIn Nvidia Uber

Browse all companies

Interview path

DSA Interview 150 All roadmaps 3,700+ Interview Q&A

Problems explorer