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
801. Minimum Swaps To Make Sequences Increasing	Solve	Hard	Amazon+1	Array Dynamic Programming
802. Find Eventual Safe States	Solve	Medium	Amazon+4	Breadth-First Search Depth-First Search+2
803. Bricks Falling When Hit	Solve	Hard	Google+1	Array Matrix+1
804. Unique Morse Code Words	Solve	Easy	Square	Array Hash Table+1
805. Split Array With Same Average	Solve	Hard	Microsoft	Array Bit Manipulation+3
806. Number of Lines To Write String	Solve	Easy	-	Array String
807. Max Increase to Keep City Skyline	Solve	Medium	Amazon+1	Array Greedy+1
808. Soup Servings	Solve	Medium	Google	Dynamic Programming Math+1
809. Expressive Words	Solve	Medium	Cisco+2	Array String+1
810. Chalkboard XOR Game	Solve	Hard	Garena	Array Bit Manipulation+3
811. Subdomain Visit Count	Solve	Medium	Indeed+4	Array Counting+2
812. Largest Triangle Area	Solve	Easy	Google	Array Geometry+1
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
815. Bus Routes	Solve	Hard	Amazon+7	Array Breadth-First Search+1
816. Ambiguous Coordinates	Solve	Medium	Google	Backtracking Enumeration+1
817. Linked List Components	Solve	Medium	Amazon+1	Array Hash Table+1
818. Race Car	Solve	Hard	Amazon+1	Dynamic Programming
819. Most Common Word	Solve	Easy	Amazon	Array Counting+2
820. Short Encoding of Words	Solve	Medium	Amazon+1	Array Hash Table+2
821. Shortest Distance to a Character	Solve	Easy	Apple+1	Array String+1
822. Card Flipping Game	Solve	Medium	-	Array Hash Table
823. Binary Trees With Factors	Solve	Medium	Amazon+2	Array Dynamic Programming+2
824. Goat Latin	Solve	Easy	Facebook	String
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
827. Making A Large Island	Solve	Hard	Adobe+10	Array Breadth-First Search+3
828. Count Unique Characters of All Substrings of a Given String	Solve	Hard	Amazon+3	Dynamic Programming Hash Table+1
829. Consecutive Numbers Sum	Solve	Hard	Bloomberg	Enumeration Math
830. Positions of Large Groups	Solve	Easy	Google	String
831. Masking Personal Information	Solve	Medium	Twitter	String
832. Flipping an Image	Solve	Easy	Google	Array Bit Manipulation+3
833. Find And Replace in String	Solve	Medium	Google+2	Array Hash Table+2
834. Sum of Distances in Tree	Solve	Hard	Google+2	Depth-First Search Dynamic Programming+2
835. Image Overlap	Solve	Medium	Bloomberg+3	Array Matrix
836. Rectangle Overlap	Solve	Easy	Docusign+2	Geometry Math
837. New 21 Game	Solve	Medium	Google	Dynamic Programming Math+2
838. Push Dominoes	Solve	Medium	Bloomberg	Dynamic Programming String+1
839. Similar String Groups	Solve	Hard	Apple+1	Array Breadth-First Search+4
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
843. Guess the Word	Solve	Hard	Bloomberg+2	Array Game Theory+3
844. Backspace String Compare	Solve	Easy	Amazon+12	Simulation Stack+2
845. Longest Mountain in Array	Solve	Medium	Bloomberg+3	Array Dynamic Programming+2
846. Hand of Straights	Solve	Medium	Google	Array Greedy+2
847. Shortest Path Visiting All Nodes	Solve	Hard	Amazon+7	Bit Manipulation Bitmask+3
848. Shifting Letters	Solve	Medium	Oracle	Array Prefix Sum+1
849. Maximize Distance to Closest Person	Solve	Medium	Amazon+3	Array
850. Rectangle Area II	Solve	Hard	-	Array Line Sweep+2