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
414. Third Maximum Number	Solve	Easy	Amazon+2	Array Sorting
415. Add Strings	Solve	Easy	Amazon+7	Math Simulation+1
422. Valid Word Square	Solve	Easy	Bloomberg+1	Array Matrix
434. Number of Segments in a String	Solve	Easy	Apple	String
441. Arranging Coins	Solve	Easy	Adobe+5	Binary Search Math
448. Find All Numbers Disappeared in an Array	Solve	Easy	Amazon+3	Array Hash Table
455. Assign Cookies	Solve	Easy	Apple	Array Greedy+2
459. Repeated Substring Pattern	Solve	Easy	Amazon+4	String String Matching
461. Hamming Distance	Solve	Easy	Google	Bit Manipulation
463. Island Perimeter	Solve	Easy	Amazon+2	Array Breadth-First Search+2
476. Number Complement	Solve	Easy	Amazon+1	Bit Manipulation
482. License Key Formatting	Solve	Easy	Capital One+1	String
485. Max Consecutive Ones	Solve	Easy	Apple+1	Array
492. Construct the Rectangle	Solve	Easy	Bloomberg	Math
495. Teemo Attacking	Solve	Easy	Riot Games+1	Array Simulation
496. Next Greater Element I	Solve	Easy	Adobe+9	Array Hash Table+2
500. Keyboard Row	Solve	Easy	Mathworks	Array Hash Table+1
501. Find Mode in Binary Search Tree	Solve	Easy	Adobe+1	Binary Search Tree Binary Tree+2
504. Base 7	Solve	Easy	Google	Math
506. Relative Ranks	Solve	Easy	Accenture+1	Array Heap (Priority Queue)+1
507. Perfect Number	Solve	Easy	Adobe	Math
509. Fibonacci Number	Solve	Easy	Adobe+8	Dynamic Programming Math+2
511. Game Play Analysis I	Solve	Easy	Adobe+4	Database
512. Game Play Analysis II	Solve	Easy	GSN Games	Database
520. Detect Capital	Solve	Easy	Amazon+1	String
521. Longest Uncommon Subsequence I	Solve	Easy	Google	String
530. Minimum Absolute Difference in BST	Solve	Easy	Bloomberg+3	Binary Search Tree Binary Tree+3
541. Reverse String II	Solve	Easy	Adobe	String Two Pointers
543. Diameter of Binary Tree	Solve	Easy	Amazon+5	Binary Tree Depth-First Search+1
551. Student Attendance Record I	Solve	Easy	Google	String
557. Reverse Words in a String III	Solve	Easy	Accolite+27	String Two Pointers
559. Maximum Depth of N-ary Tree	Solve	Easy	Microsoft	Breadth-First Search Depth-First Search+1
561. Array Partition	Solve	Easy	Adobe+2	Array Counting Sort+2
563. Binary Tree Tilt	Solve	Easy	Indeed	Binary Tree Depth-First Search+1
566. Reshape the Matrix	Solve	Easy	Bloomberg+1	Array Matrix+1
572. Subtree of Another Tree	Solve	Easy	Amazon+3	Binary Tree Depth-First Search+3
575. Distribute Candies	Solve	Easy	LiveRamp	Array Hash Table
577. Employee Bonus	Solve	Easy	Amazon+2	Database
584. Find Customer Referee	Solve	Easy	Adobe+5	Database
586. Customer Placing the Largest Number of Orders	Solve	Easy	Adobe+4	Database
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
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
603. Consecutive Available Seats	Solve	Easy	Amazon	Database
604. Design Compressed String Iterator	Solve	Easy	Google	Array Design+2