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
830. Positions of Large Groups	Solve	Easy	Google	String
832. Flipping an Image	Solve	Easy	Google	Array Bit Manipulation+3
836. Rectangle Overlap	Solve	Easy	Docusign+2	Geometry Math
844. Backspace String Compare	Solve	Easy	Amazon+12	Simulation Stack+2
859. Buddy Strings	Solve	Easy	DoorDash+4	Hash Table String
860. Lemonade Change	Solve	Easy	Amazon+2	Array Greedy
867. Transpose Matrix	Solve	Easy	Amazon+3	Array Matrix+1
868. Binary Gap	Solve	Easy	Twitter	Bit Manipulation
872. Leaf-Similar Trees	Solve	Easy	Google	Binary Tree Depth-First Search+1
876. Middle of the Linked List	Solve	Easy	Adobe+6	Linked List Two Pointers
883. Projection Area of 3D Shapes	Solve	Easy	-	Array Geometry+2
884. Uncommon Words from Two Sentences	Solve	Easy	Facebook+1	Counting Hash Table+1
888. Fair Candy Swap	Solve	Easy	Amazon+1	Array Binary Search+2
892. Surface Area of 3D Shapes	Solve	Easy	Amazon	Array Geometry+2
896. Monotonic Array	Solve	Easy	Amazon+3	Array
897. Increasing Order Search Tree	Solve	Easy	Facebook	Binary Search Tree Binary Tree+3
905. Sort Array By Parity	Solve	Easy	Amazon+11	Array Sorting+1
908. Smallest Range I	Solve	Easy	Adobe	Array Math
914. X of a Kind in a Deck of Cards	Solve	Easy	Google	Array Counting+3
917. Reverse Only Letters	Solve	Easy	Amazon	String Two Pointers
922. Sort Array By Parity II	Solve	Easy	Microsoft	Array Sorting+1
925. Long Pressed Name	Solve	Easy	Google	String Two Pointers
929. Unique Email Addresses	Solve	Easy	Intuit	Array Hash Table+1
933. Number of Recent Calls	Solve	Easy	Bloomberg+1	Data Stream Design+1
938. Range Sum of BST	Solve	Easy	Amazon+3	Binary Search Tree Binary Tree+2
941. Valid Mountain Array	Solve	Easy	Amazon	Array
942. DI String Match	Solve	Easy	Microsoft	Array Greedy+2
944. Delete Columns to Make Sorted	Solve	Easy	Google	Array String
953. Verifying an Alien Dictionary	Solve	Easy	Amazon+3	Array Hash Table+1
961. N-Repeated Element in Size 2N Array	Solve	Easy	Akamai	Array Hash Table
965. Univalued Binary Tree	Solve	Easy	Google	Binary Tree Breadth-First Search+2
976. Largest Perimeter Triangle	Solve	Easy	Tesla	Array Greedy+2
977. Squares of a Sorted Array	Solve	Easy	Amazon+4	Array Sorting+1
989. Add to Array-Form of Integer	Solve	Easy	Facebook	Array Math
993. Cousins in Binary Tree	Solve	Easy	Amazon+2	Binary Tree Breadth-First Search+2
997. Find the Town Judge	Solve	Easy	Adobe+3	Array Graph+1
999. Available Captures for Rook	Solve	Easy	Square	Array Matrix+1
1002. Find Common Characters	Solve	Easy	Amazon	Array Hash Table+1
1005. Maximize Sum Of Array After K Negations	Solve	Easy	Amazon+1	Array Greedy+1
1009. Complement of Base 10 Integer	Solve	Easy	Adobe+1	Bit Manipulation
1013. Partition Array Into Three Parts With Equal Sum	Solve	Easy	Google+1	Array Greedy
1018. Binary Prefix Divisible By 5	Solve	Easy	-	Array Bit Manipulation
1021. Remove Outermost Parentheses	Solve	Easy	Microsoft	Stack String
1022. Sum of Root To Leaf Binary Numbers	Solve	Easy	Amazon+2	Binary Tree Depth-First Search+1
1025. Divisor Game	Solve	Easy	Bloomberg+1	Brainteaser Dynamic Programming+2
1030. Matrix Cells in Distance Order	Solve	Easy	Yahoo	Array Geometry+3
1037. Valid Boomerang	Solve	Easy	Google	Array Geometry+1
1046. Last Stone Weight	Solve	Easy	Amazon+3	Array Heap (Priority Queue)
1047. Remove All Adjacent Duplicates In String	Solve	Easy	Amazon+1	Stack String
1050. Actors and Directors Who Cooperated At Least Three Times	Solve	Easy	Amazon	Database