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
901. Online Stock Span	Solve	Medium	Adobe+2	Data Stream Design+2
902. Numbers At Most N Given Digit Set	Solve	Hard	Amazon+1	Array Binary Search+3
903. Valid Permutations for DI Sequence	Solve	Hard	Amazon+1	Dynamic Programming Prefix Sum+1
904. Fruit Into Baskets	Solve	Medium	Amazon	Array Hash Table+1
905. Sort Array By Parity	Solve	Easy	Amazon+11	Array Sorting+1
906. Super Palindromes	Solve	Hard	Google	Enumeration Math
907. Sum of Subarray Minimums	Solve	Medium	Amazon+8	Array Dynamic Programming+2
908. Smallest Range I	Solve	Easy	Adobe	Array Math
909. Snakes and Ladders	Solve	Medium	Adobe+6	Array Breadth-First Search+1
910. Smallest Range II	Solve	Medium	Adobe+3	Array Greedy+2
911. Online Election	Solve	Medium	Atlassian+1	Array Binary Search+2
912. Sort an Array	Solve	Medium	Amazon+1	Array Bucket Sort+6
913. Cat and Mouse	Solve	Hard	Google	Dynamic Programming Game Theory+4
914. X of a Kind in a Deck of Cards	Solve	Easy	Google	Array Counting+3
915. Partition Array into Disjoint Intervals	Solve	Medium	Amazon+1	Array
916. Word Subsets	Solve	Medium	Adobe+2	Array Hash Table+1
917. Reverse Only Letters	Solve	Easy	Amazon	String Two Pointers
918. Maximum Sum Circular Subarray	Solve	Medium	Alibaba+4	Array Divide and Conquer+3
919. Complete Binary Tree Inserter	Solve	Medium	Facebook+3	Binary Tree Breadth-First Search+2
920. Number of Music Playlists	Solve	Hard	Amazon+3	Combinatorics Dynamic Programming+1
921. Minimum Add to Make Parentheses Valid	Solve	Medium	Amazon+3	Greedy Stack+1
922. Sort Array By Parity II	Solve	Easy	Microsoft	Array Sorting+1
923. 3Sum With Multiplicity	Solve	Medium	Adobe+1	Array Counting+3
924. Minimize Malware Spread	Solve	Hard	Adobe+3	Array Breadth-First Search+4
925. Long Pressed Name	Solve	Easy	Google	String Two Pointers
926. Flip String to Monotone Increasing	Solve	Medium	Amazon+2	Dynamic Programming String
927. Three Equal Parts	Solve	Hard	Hotstar	Array Math
928. Minimize Malware Spread II	Solve	Hard	Dropbox+1	Array Breadth-First Search+4
929. Unique Email Addresses	Solve	Easy	Intuit	Array Hash Table+1
930. Binary Subarrays With Sum	Solve	Medium	Amazon+4	Array Hash Table+2
931. Minimum Falling Path Sum	Solve	Medium	Google	Array Dynamic Programming+1
932. Beautiful Array	Solve	Medium	Google	Array Divide and Conquer+1
933. Number of Recent Calls	Solve	Easy	Bloomberg+1	Data Stream Design+1
934. Shortest Bridge	Solve	Medium	Dell+5	Array Breadth-First Search+2
935. Knight Dialer	Solve	Medium	Amazon+5	Dynamic Programming
936. Stamping The Sequence	Solve	Hard	-	Greedy Queue+2
937. Reorder Data in Log Files	Solve	Medium	Amazon+1	Array Sorting+1
938. Range Sum of BST	Solve	Easy	Amazon+3	Binary Search Tree Binary Tree+2
939. Minimum Area Rectangle	Solve	Medium	Facebook+2	Array Geometry+3
940. Distinct Subsequences II	Solve	Hard	Google	Dynamic Programming String
941. Valid Mountain Array	Solve	Easy	Amazon	Array
942. DI String Match	Solve	Easy	Microsoft	Array Greedy+2
943. Find the Shortest Superstring	Solve	Hard	-	Array Bit Manipulation+3
944. Delete Columns to Make Sorted	Solve	Easy	Google	Array String
945. Minimum Increment to Make Array Unique	Solve	Medium	Coursera+1	Array Counting+2
946. Validate Stack Sequences	Solve	Medium	Amazon+2	Array Simulation+1
947. Most Stones Removed with Same Row or Column	Solve	Medium	Amazon+3	Depth-First Search Graph+2
948. Bag of Tokens	Solve	Medium	Adobe+3	Array Greedy+2
949. Largest Time for Given Digits	Solve	Medium	Amazon+3	Array Enumeration+1
950. Reveal Cards In Increasing Order	Solve	Medium	Adobe	Array Queue+2