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
651. 4 Keys Keyboard	Solve	Medium	Microsoft	Dynamic Programming Math
652. Find Duplicate Subtrees	Solve	Medium	Amazon+2	Binary Tree Depth-First Search+2
653. Two Sum IV - Input is a BST	Solve	Easy	Amazon+1	Binary Search Tree Binary Tree+5
654. Maximum Binary Tree	Solve	Medium	Amazon	Array Binary Tree+4
655. Print Binary Tree	Solve	Medium	Amazon+1	Binary Tree Breadth-First Search+2
656. Coin Path	Solve	Hard	Google	Array Dynamic Programming
657. Robot Return to Origin	Solve	Easy	Amazon+3	Simulation String
658. Find K Closest Elements	Solve	Medium	Amazon+6	Array Binary Search+4
659. Split Array into Consecutive Subsequences	Solve	Medium	Bloomberg+1	Array Greedy+2
660. Remove 9	Solve	Hard	Google	Math
661. Image Smoother	Solve	Easy	Amazon+2	Array Matrix
662. Maximum Width of Binary Tree	Solve	Medium	Amazon+4	Binary Tree Breadth-First Search+2
663. Equal Tree Partition	Solve	Medium	Amazon	Binary Tree Depth-First Search+1
664. Strange Printer	Solve	Hard	Google+2	Dynamic Programming String
665. Non-decreasing Array	Solve	Medium	Bloomberg	Array
666. Path Sum IV	Solve	Medium	Alibaba+1	Array Binary Tree+3
667. Beautiful Arrangement II	Solve	Medium	Google	Array Math
668. Kth Smallest Number in Multiplication Table	Solve	Hard	Rubrik	Binary Search Math
669. Trim a Binary Search Tree	Solve	Medium	Amazon+3	Binary Search Tree Binary Tree+2
670. Maximum Swap	Solve	Medium	Amazon+3	Greedy Math
671. Second Minimum Node In a Binary Tree	Solve	Easy	LinkedIn	Binary Tree Depth-First Search+1
672. Bulb Switcher II	Solve	Medium	Microsoft	Bit Manipulation Breadth-First Search+2
673. Number of Longest Increasing Subsequence	Solve	Medium	Amazon+6	Array Binary Indexed Tree+2
674. Longest Continuous Increasing Subsequence	Solve	Easy	Facebook	Array
675. Cut Off Trees for Golf Event	Solve	Hard	Amazon+1	Array Breadth-First Search+2
676. Implement Magic Dictionary	Solve	Medium	Facebook+1	Depth-First Search Design+3
677. Map Sum Pairs	Solve	Medium	Google	Design Hash Table+2
678. Valid Parenthesis String	Solve	Medium	Amazon+4	Dynamic Programming Greedy+2
679. 24 Game	Solve	Hard	Google+1	Array Backtracking+1
680. Valid Palindrome II	Solve	Easy	Amazon+6	Greedy String+1
681. Next Closest Time	Solve	Medium	Amazon+1	Backtracking Enumeration+2
682. Baseball Game	Solve	Easy	Uber	Array Simulation+1
683. K Empty Slots	Solve	Hard	Google+1	Array Binary Indexed Tree+6
684. Redundant Connection	Solve	Medium	Google+1	Breadth-First Search Depth-First Search+2
685. Redundant Connection II	Solve	Hard	Amazon	Breadth-First Search Depth-First Search+2
686. Repeated String Match	Solve	Medium	Google	String String Matching
687. Longest Univalue Path	Solve	Medium	Amazon+1	Binary Tree Depth-First Search+1
688. Knight Probability in Chessboard	Solve	Medium	Amazon+5	Dynamic Programming
689. Maximum Sum of 3 Non-Overlapping Subarrays	Solve	Hard	Facebook	Array Dynamic Programming
690. Employee Importance	Solve	Medium	Apple+1	Array Breadth-First Search+3
691. Stickers to Spell Word	Solve	Hard	Facebook	Array Backtracking+4
692. Top K Frequent Words	Solve	Medium	Amazon+8	Bucket Sort Counting+5
693. Binary Number with Alternating Bits	Solve	Easy	Yahoo	Bit Manipulation
694. Number of Distinct Islands	Solve	Medium	Amazon+3	Breadth-First Search Depth-First Search+3
695. Max Area of Island	Solve	Medium	Amazon+8	Array Breadth-First Search+3
696. Count Binary Substrings	Solve	Easy	Adobe+8	String Two Pointers
697. Degree of an Array	Solve	Easy	Adobe+6	Array Hash Table
698. Partition to K Equal Sum Subsets	Solve	Medium	Amazon+2	Array Backtracking+4
699. Falling Squares	Solve	Hard	Square+1	Array Ordered Set+1
700. Search in a Binary Search Tree	Solve	Easy	Amazon	Binary Search Tree Binary Tree+1