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
551. Student Attendance Record I	Solve	Easy	Google	String
552. Student Attendance Record II	Solve	Hard	Google	Dynamic Programming
553. Optimal Division	Solve	Medium	Amazon	Array Dynamic Programming+1
554. Brick Wall	Solve	Medium	Bloomberg+1	Array Hash Table
555. Split Concatenated Strings	Solve	Medium	Alibaba	Array Greedy+1
556. Next Greater Element III	Solve	Medium	Adobe+10	Math String+1
557. Reverse Words in a String III	Solve	Easy	Accolite+27	String Two Pointers
558. Logical OR of Two Binary Grids Represented as Quad-Trees	Solve	Medium	-	Divide and Conquer Tree
559. Maximum Depth of N-ary Tree	Solve	Easy	Microsoft	Breadth-First Search Depth-First Search+1
560. Subarray Sum Equals K	Solve	Medium	Adobe+15	Array Hash Table+1
561. Array Partition	Solve	Easy	Adobe+2	Array Counting Sort+2
562. Longest Line of Consecutive One in Matrix	Solve	Medium	Google	Array Dynamic Programming+1
563. Binary Tree Tilt	Solve	Easy	Indeed	Binary Tree Depth-First Search+1
564. Find the Closest Palindrome	Solve	Hard	Amazon+5	Math String
565. Array Nesting	Solve	Medium	Adobe+1	Array Depth-First Search
566. Reshape the Matrix	Solve	Easy	Bloomberg+1	Array Matrix+1
567. Permutation in String	Solve	Medium	Amazon+7	Hash Table Sliding Window+2
568. Maximum Vacation Days	Solve	Hard	Microsoft	Array Dynamic Programming+1
569. Median Employee Salary	Solve	Hard	Google	Database
570. Managers with at Least 5 Direct Reports	Solve	Medium	Adobe+7	Database
571. Find Median Given Frequency of Numbers	Solve	Hard	Pinterest	Database
572. Subtree of Another Tree	Solve	Easy	Amazon+3	Binary Tree Depth-First Search+3
573. Squirrel Simulation	Solve	Medium	Square	Array Math
574. Winning Candidate	Solve	Medium	-	Database
575. Distribute Candies	Solve	Easy	LiveRamp	Array Hash Table
576. Out of Boundary Paths	Solve	Medium	Amazon+1	Dynamic Programming
577. Employee Bonus	Solve	Easy	Amazon+2	Database
578. Get Highest Answer Rate Question	Solve	Medium	Facebook	Database
579. Find Cumulative Salary of an Employee	Solve	Hard	Amazon	Database
580. Count Student Number in Departments	Solve	Medium	Twitter	Database
581. Shortest Unsorted Continuous Subarray	Solve	Medium	Amazon+1	Array Greedy+4
582. Kill Process	Solve	Medium	Amazon+1	Array Breadth-First Search+3
583. Delete Operation for Two Strings	Solve	Medium	Amazon	Dynamic Programming String
584. Find Customer Referee	Solve	Easy	Adobe+5	Database
585. Investments in 2016	Solve	Medium	Twitter	Database
586. Customer Placing the Largest Number of Orders	Solve	Easy	Adobe+4	Database
587. Erect the Fence	Solve	Hard	Google	Array Geometry+1
588. Design In-Memory File System	Solve	Hard	Amazon+5	Design Hash Table+3
589. N-ary Tree Preorder Traversal	Solve	Easy	Google	Depth-First Search Stack+1
590. N-ary Tree Postorder Traversal	Solve	Easy	Amazon	Depth-First Search Stack+1
591. Tag Validator	Solve	Hard	Airbnb+1	Stack String
592. Fraction Addition and Subtraction	Solve	Medium	Goldman Sachs	Math Simulation+1
593. Valid Square	Solve	Medium	Google+2	Geometry Math
594. Longest Harmonious Subsequence	Solve	Easy	LiveRamp	Array Counting+3
595. Big Countries	Solve	Easy	Adobe+6	Database
596. Classes More Than 5 Students	Solve	Easy	-	Database
597. Friend Requests I: Overall Acceptance Rate	Solve	Easy	Facebook	Database
598. Range Addition II	Solve	Easy	Amazon	Array Math
599. Minimum Index Sum of Two Lists	Solve	Easy	Apple+2	Array Hash Table+1
600. Non-negative Integers without Consecutive Ones	Solve	Hard	Pocket Gems	Dynamic Programming