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
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
854. K-Similar Strings	Solve	Hard	Bytedance+2	Breadth-First Search String
855. Exam Room	Solve	Medium	Google+3	Design Heap (Priority Queue)+1
856. Score of Parentheses	Solve	Medium	Amazon+4	Stack String
857. Minimum Cost to Hire K Workers	Solve	Hard	Amazon+2	Array Greedy+2
858. Mirror Reflection	Solve	Medium	Adobe+1	Geometry Math+1
859. Buddy Strings	Solve	Easy	DoorDash+4	Hash Table String
860. Lemonade Change	Solve	Easy	Amazon+2	Array Greedy
861. Score After Flipping Matrix	Solve	Medium	Amazon+1	Array Bit Manipulation+2
862. Shortest Subarray with Sum at Least K	Solve	Hard	Adobe+3	Array Binary Search+5
863. All Nodes Distance K in Binary Tree	Solve	Medium	Amazon+18	Binary Tree Breadth-First Search+3
864. Shortest Path to Get All Keys	Solve	Hard	Airbnb+5	Array Bit Manipulation+2
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
867. Transpose Matrix	Solve	Easy	Amazon+3	Array Matrix+1
868. Binary Gap	Solve	Easy	Twitter	Bit Manipulation
869. Reordered Power of 2	Solve	Medium	Adobe+4	Counting Enumeration+3
870. Advantage Shuffle	Solve	Medium	Facebook	Array Greedy+2
871. Minimum Number of Refueling Stops	Solve	Hard	Amazon+9	Array Dynamic Programming+2
872. Leaf-Similar Trees	Solve	Easy	Google	Binary Tree Depth-First Search+1
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
876. Middle of the Linked List	Solve	Easy	Adobe+6	Linked List Two Pointers
877. Stone Game	Solve	Medium	Amazon	Array Dynamic Programming+2
878. Nth Magical Number	Solve	Hard	Google	Binary Search Math
879. Profitable Schemes	Solve	Hard	Amazon+1	Array Dynamic Programming
880. Decoded String at Index	Solve	Medium	Adobe+4	Stack String
881. Boats to Save People	Solve	Medium	Amazon+6	Array Greedy+2
882. Reachable Nodes In Subdivided Graph	Solve	Hard	-	Graph Heap (Priority Queue)+1
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
885. Spiral Matrix III	Solve	Medium	Tesla	Array Matrix+1
886. Possible Bipartition	Solve	Medium	Amazon+7	Breadth-First Search Depth-First Search+2
887. Super Egg Drop	Solve	Hard	Amazon+3	Binary Search Dynamic Programming+1
888. Fair Candy Swap	Solve	Easy	Amazon+1	Array Binary 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
891. Sum of Subsequence Widths	Solve	Hard	Publicis Sapient	Array Math+1
892. Surface Area of 3D Shapes	Solve	Easy	Amazon	Array Geometry+2
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
895. Maximum Frequency Stack	Solve	Hard	Adobe+7	Design Hash Table+2
896. Monotonic Array	Solve	Easy	Amazon+3	Array
897. Increasing Order Search Tree	Solve	Easy	Facebook	Binary Search Tree Binary Tree+3
898. Bitwise ORs of Subarrays	Solve	Medium	-	Array Bit Manipulation+1
899. Orderly Queue	Solve	Hard	Amazon	Math Sorting+1
900. RLE Iterator	Solve	Medium	Google	Array Counting+2