Dashboard Questions Topics Companies Sheets

Data Structures & Algorithms

Practice 3,374+ coding problems from top companies. Master DSA concepts and ace your interviews.

3,374

Problems

840

Easy

1762

Medium

772

Hard

Difficulty

All3374 Easy840 Medium1762 Hard772

Title	Solve	Difficulty	Companies	Topics
2628. JSON Deep Equal	Solve	Medium	-
2631. Group By	Solve	Medium	-
2632. Curry	Solve	Medium	-
2633. Convert Object to JSON String	Solve	Medium	-
2636. Promise Pool	Solve	Medium	-
2637. Promise Time Limit	Solve	Medium	-
2638. Count the Number of K-Free Subsets	Solve	Medium	Amazon	Array Combinatorics+3
2640. Find the Score of All Prefixes of an Array	Solve	Medium	TikTok	Array Prefix Sum
2641. Cousins in Binary Tree II	Solve	Medium	Amazon	Binary Tree Breadth-First Search+3
2645. Minimum Additions to Make Valid String	Solve	Medium	Google	Dynamic Programming Greedy+2
2649. Nested Array Generator	Solve	Medium	-
2653. Sliding Subarray Beauty	Solve	Medium	-	Array Hash Table+1
2654. Minimum Number of Operations to Make All Array Elements Equal to 1	Solve	Medium	-	Array Math+1
2655. Find Maximal Uncovered Ranges	Solve	Medium	-	Array Sorting
2657. Find the Prefix Common Array of Two Arrays	Solve	Medium	Yandex	Array Bit Manipulation+1
2658. Maximum Number of Fish in a Grid	Solve	Medium	Adobe	Array Breadth-First Search+3
2661. First Completely Painted Row or Column	Solve	Medium	Citadel	Array Hash Table+1
2662. Minimum Cost of a Path With Special Roads	Solve	Medium	Samsung	Array Graph+2
2664. The Knight’s Tour	Solve	Medium	Microsoft	Array Backtracking+1
2671. Frequency Tracker	Solve	Medium	-	Design Hash Table
2672. Number of Adjacent Elements With the Same Color	Solve	Medium	-	Array
2673. Make Costs of Paths Equal in a Binary Tree	Solve	Medium	DE Shaw	Array Binary Tree+3
2674. Split a Circular Linked List	Solve	Medium	-	Linked List Two Pointers
2676. Throttle	Solve	Medium	-
2679. Sum in a Matrix	Solve	Medium	-	Array Heap (Priority Queue)+3
2680. Maximum OR	Solve	Medium	-	Array Bit Manipulation+2
2683. Neighboring Bitwise XOR	Solve	Medium	-	Array Bit Manipulation
2684. Maximum Number of Moves in a Grid	Solve	Medium	Amazon	Array Dynamic Programming+1
2685. Count the Number of Complete Components	Solve	Medium	-	Breadth-First Search Depth-First Search+2
2686. Immediate Food Delivery III	Solve	Medium	-	Database
2688. Find Active Users	Solve	Medium	-	Database
2692. Make Object Immutable	Solve	Medium	-
2693. Call Function with Custom Context	Solve	Medium	-
2694. Event Emitter	Solve	Medium	-
2698. Find the Punishment Number of an Integer	Solve	Medium	-	Backtracking Math
2700. Differences Between Two Objects	Solve	Medium	-
2705. Compact Object	Solve	Medium	-
2707. Extra Characters in a String	Solve	Medium	Amazon+2	Array Dynamic Programming+3
2708. Maximum Strength of a Group	Solve	Medium	Bloomberg	Array Backtracking+5
2711. Difference of Number of Distinct Values on Diagonals	Solve	Medium	-	Array Hash Table+1
2712. Minimum Cost to Make All Characters Equal	Solve	Medium	-	Dynamic Programming Greedy+1
2718. Sum of Matrix After Queries	Solve	Medium	Sprinklr	Array Hash Table
2721. Execute Asynchronous Functions in Parallel	Solve	Medium	-
2722. Join Two Arrays by ID	Solve	Medium	-
2730. Find the Longest Semi-Repetitive Substring	Solve	Medium	-	Sliding Window String
2731. Movement of Robots	Solve	Medium	-	Array Brainteaser+2
2734. Lexicographically Smallest String After Substring Operation	Solve	Medium	-	Greedy String
2735. Collecting Chocolates	Solve	Medium	Amazon	Array Enumeration
2737. Find the Closest Marked Node	Solve	Medium	-	Array Graph+2
2738. Count Occurrences in Text	Solve	Medium	-	Database