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
523. Continuous Subarray Sum	Solve	Medium	Amazon+6	Array Hash Table+2
524. Longest Word in Dictionary through Deleting	Solve	Medium	Google	Array Sorting+2
525. Contiguous Array	Solve	Medium	Amazon+3	Array Hash Table+1
526. Beautiful Arrangement	Solve	Medium	Cisco	Array Backtracking+3
528. Random Pick with Weight	Solve	Medium	Amazon+7	Array Binary Search+3
529. Minesweeper	Solve	Medium	Amazon+6	Array Breadth-First Search+2
531. Lonely Pixel I	Solve	Medium	Google+2	Array Hash Table+1
532. K-diff Pairs in an Array	Solve	Medium	Adobe+7	Array Binary Search+3
533. Lonely Pixel II	Solve	Medium	Google	Array Hash Table+1
534. Game Play Analysis III	Solve	Medium	GSN Games	Database
535. Encode and Decode TinyURL	Solve	Medium	Amazon+2	Design Hash Function+2
536. Construct Binary Tree from String	Solve	Medium	Facebook	Binary Tree Depth-First Search+3
537. Complex Number Multiplication	Solve	Medium	Amazon	Math Simulation+1
538. Convert BST to Greater Tree	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+2
539. Minimum Time Difference	Solve	Medium	Amazon+1	Array Math+2
540. Single Element in a Sorted Array	Solve	Medium	Amazon+5	Array Binary Search
542. 01 Matrix	Solve	Medium	Adobe+16	Array Breadth-First Search+2
544. Output Contest Matches	Solve	Medium	Google	Recursion Simulation+1
545. Boundary of Binary Tree	Solve	Medium	Amazon+3	Binary Tree Depth-First Search+1
547. Number of Provinces	Solve	Medium	Amazon+6	Breadth-First Search Depth-First Search+2
549. Binary Tree Longest Consecutive Sequence II	Solve	Medium	Google	Binary Tree Depth-First Search+1
550. Game Play Analysis IV	Solve	Medium	Adobe+1	Database
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
558. Logical OR of Two Binary Grids Represented as Quad-Trees	Solve	Medium	-	Divide and Conquer Tree
560. Subarray Sum Equals K	Solve	Medium	Adobe+15	Array Hash Table+1
562. Longest Line of Consecutive One in Matrix	Solve	Medium	Google	Array Dynamic Programming+1
565. Array Nesting	Solve	Medium	Adobe+1	Array Depth-First Search
567. Permutation in String	Solve	Medium	Amazon+7	Hash Table Sliding Window+2
570. Managers with at Least 5 Direct Reports	Solve	Medium	Adobe+7	Database
573. Squirrel Simulation	Solve	Medium	Square	Array Math
574. Winning Candidate	Solve	Medium	-	Database
576. Out of Boundary Paths	Solve	Medium	Amazon+1	Dynamic Programming
578. Get Highest Answer Rate Question	Solve	Medium	Facebook	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
585. Investments in 2016	Solve	Medium	Twitter	Database
592. Fraction Addition and Subtraction	Solve	Medium	Goldman Sachs	Math Simulation+1
593. Valid Square	Solve	Medium	Google+2	Geometry Math
602. Friend Requests II: Who Has the Most Friends	Solve	Medium	Amazon+1	Database
606. Construct String from Binary Tree	Solve	Medium	Adobe+3	Binary Tree Depth-First Search+2
608. Tree Node	Solve	Medium	Microsoft+1	Database
609. Find Duplicate File in System	Solve	Medium	Apple+1	Array Hash Table+1
611. Valid Triangle Number	Solve	Medium	Amazon+2	Array Binary Search+3
612. Shortest Distance in a Plane	Solve	Medium	-	Database
614. Second Degree Follower	Solve	Medium	-	Database