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
808. Soup Servings	Solve	Medium	Google	Dynamic Programming Math+1
809. Expressive Words	Solve	Medium	Cisco+2	Array String+1
811. Subdomain Visit Count	Solve	Medium	Indeed+4	Array Counting+2
813. Largest Sum of Averages	Solve	Medium	Google	Array Dynamic Programming+1
814. Binary Tree Pruning	Solve	Medium	Apple+1	Binary Tree Depth-First Search+1
816. Ambiguous Coordinates	Solve	Medium	Google	Backtracking Enumeration+1
817. Linked List Components	Solve	Medium	Amazon+1	Array Hash Table+1
820. Short Encoding of Words	Solve	Medium	Amazon+1	Array Hash Table+2
822. Card Flipping Game	Solve	Medium	-	Array Hash Table
823. Binary Trees With Factors	Solve	Medium	Amazon+2	Array Dynamic Programming+2
825. Friends Of Appropriate Ages	Solve	Medium	Facebook	Array Binary Search+2
826. Most Profit Assigning Work	Solve	Medium	Amazon+2	Array Binary Search+3
831. Masking Personal Information	Solve	Medium	Twitter	String
833. Find And Replace in String	Solve	Medium	Google+2	Array Hash Table+2
835. Image Overlap	Solve	Medium	Bloomberg+3	Array Matrix
837. New 21 Game	Solve	Medium	Google	Dynamic Programming Math+2
838. Push Dominoes	Solve	Medium	Bloomberg	Dynamic Programming String+1
840. Magic Squares In Grid	Solve	Medium	Google	Array Hash Table+2
841. Keys and Rooms	Solve	Medium	Amazon+1	Breadth-First Search Depth-First Search+1
842. Split Array into Fibonacci Sequence	Solve	Medium	Amazon	Backtracking String
845. Longest Mountain in Array	Solve	Medium	Bloomberg+3	Array Dynamic Programming+2
846. Hand of Straights	Solve	Medium	Google	Array Greedy+2
848. Shifting Letters	Solve	Medium	Oracle	Array Prefix Sum+1
849. Maximize Distance to Closest Person	Solve	Medium	Amazon+3	Array
851. Loud and Rich	Solve	Medium	Amazon+2	Array Depth-First Search+2
852. Peak Index in a Mountain Array	Solve	Medium	Accolite+22	Array Binary Search
853. Car Fleet	Solve	Medium	Amazon+5	Array Monotonic Stack+2
855. Exam Room	Solve	Medium	Google+3	Design Heap (Priority Queue)+1
856. Score of Parentheses	Solve	Medium	Amazon+4	Stack String
858. Mirror Reflection	Solve	Medium	Adobe+1	Geometry Math+1
861. Score After Flipping Matrix	Solve	Medium	Amazon+1	Array Bit Manipulation+2
863. All Nodes Distance K in Binary Tree	Solve	Medium	Amazon+18	Binary Tree Breadth-First Search+3
865. Smallest Subtree with all the Deepest Nodes	Solve	Medium	Amazon+2	Binary Tree Breadth-First Search+3
866. Prime Palindrome	Solve	Medium	-	Math Number Theory
869. Reordered Power of 2	Solve	Medium	Adobe+4	Counting Enumeration+3
870. Advantage Shuffle	Solve	Medium	Facebook	Array Greedy+2
873. Length of Longest Fibonacci Subsequence	Solve	Medium	Baidu	Array Dynamic Programming+1
874. Walking Robot Simulation	Solve	Medium	Jane Street	Array Hash Table+1
875. Koko Eating Bananas	Solve	Medium	Airbnb+4	Array Binary Search
877. Stone Game	Solve	Medium	Amazon	Array Dynamic Programming+2
880. Decoded String at Index	Solve	Medium	Adobe+4	Stack String
881. Boats to Save People	Solve	Medium	Amazon+6	Array Greedy+2
885. Spiral Matrix III	Solve	Medium	Tesla	Array Matrix+1
886. Possible Bipartition	Solve	Medium	Amazon+7	Breadth-First Search Depth-First Search+2
889. Construct Binary Tree from Preorder and Postorder Traversal	Solve	Medium	Amazon+1	Array Binary Tree+3
890. Find and Replace Pattern	Solve	Medium	Apple	Array Hash Table+1
893. Groups of Special-Equivalent Strings	Solve	Medium	Facebook	Array Hash Table+2
894. All Possible Full Binary Trees	Solve	Medium	Adobe+6	Binary Tree Dynamic Programming+3
898. Bitwise ORs of Subarrays	Solve	Medium	-	Array Bit Manipulation+1
900. RLE Iterator	Solve	Medium	Google	Array Counting+2