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Problems

2,093 problems

Has videoPremium onlyReset
Array1,196Hash Table465String434Greedy327Math327Dynamic Programming324Sorting300Depth-First Search208Binary Search187Breadth-First Search165Matrix163Tree157Prefix Sum153Two Pointers148Database135All topics

Medium · With video · 2,093 results

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TitleSolutionAcceptDifficultyTopics
614. Second Degree FollowerVideoPremium
Solution41.0%Medium
Database
616. Add Bold Tag in StringVideoPremium
Solution51.4%Medium
Array, Hash Table +3· 4 companies
621. Task SchedulerVideo
Solution64.0%Medium
Array, Counting +4· 24 companies
622. Design Circular QueueVideo
Solution55.4%Medium
Array, Design +2· 21 companies
623. Add One Row to TreeVideo
Solution64.1%Medium
Binary Tree, Breadth-First Search +2· 3 companies
624. Maximum Distance in ArraysVideo
Solution45.7%Medium
Array, Greedy· 5 companies
625. Minimum FactorizationVideoPremium
Solution34.2%Medium
Greedy, Math· 1 company
626. Exchange SeatsVideo
Solution75.1%Medium
Database· 9 companies
633. Sum of Square NumbersVideo
Solution37.0%Medium
Binary Search, Math +1· 6 companies
634. Find the Derangement of An ArrayVideoPremium
Solution41.9%Medium
Dynamic Programming, Math· 1 company
635. Design Log Storage SystemVideoPremium
Solution59.8%Medium
Design, Hash Table +2· 4 companies
636. Exclusive Time of FunctionsVideo
Solution66.2%Medium
Array, Stack· 13 companies
638. Shopping OffersVideo
Solution52.9%Medium
Array, Backtracking +4· 6 companies
640. Solve the EquationVideo
Solution46.7%Medium
Math, Simulation +1· 2 companies
641. Design Circular DequeVideo
Solution65.2%Medium
Array, Design +2· 5 companies
646. Maximum Length of Pair ChainVideo
Solution62.2%Medium
Array, Dynamic Programming +2· 2 companies
647. Palindromic SubstringsVideo
Solution73.2%Medium
Dynamic Programming, String +1· 25 companies
648. Replace WordsVideo
Solution68.7%Medium
Array, Hash Table +2· 4 companies
649. Dota2 SenateVideo
Solution50.3%Medium
Greedy, Queue +1· 6 companies
650. 2 Keys KeyboardVideo
Solution59.6%Medium
Dynamic Programming, Math· 7 companies
651. 4 Keys KeyboardVideoPremium
Solution56.5%Medium
Dynamic Programming, Math· 2 companies
652. Find Duplicate SubtreesVideo
Solution60.6%Medium
Binary Tree, Depth-First Search +2· 8 companies
654. Maximum Binary TreeVideo
Solution86.3%Medium
Array, Binary Tree +4· 3 companies
655. Print Binary TreeVideo
Solution67.1%Medium
Binary Tree, Breadth-First Search +2· 5 companies
658. Find K Closest ElementsVideo
Solution50.1%Medium
Array, Binary Search +4· 18 companies
659. Split Array into Consecutive SubsequencesVideo
Solution52.7%Medium
Array, Greedy +2· 2 companies
662. Maximum Width of Binary TreeVideo
Solution46.0%Medium
Binary Tree, Breadth-First Search +2· 8 companies
663. Equal Tree PartitionVideoPremium
Solution42.3%Medium
Binary Tree, Depth-First Search +1· 1 company
665. Non-decreasing ArrayVideo
Solution25.5%Medium
Array· 6 companies
666. Path Sum IVVideoPremium
Solution62.5%Medium
Array, Binary Tree +3· 1 company
667. Beautiful Arrangement IIVideo
Solution61.1%Medium
Array, Math· 2 companies
669. Trim a Binary Search TreeVideo
Solution66.9%Medium
Binary Search Tree, Binary Tree +2· 4 companies
670. Maximum SwapVideo
Solution51.6%Medium
Greedy, Math· 9 companies
672. Bulb Switcher IIVideo
Solution51.2%Medium
Bit Manipulation, Breadth-First Search +2· 1 company
673. Number of Longest Increasing SubsequenceVideo
Solution52.8%Medium
Array, Binary Indexed Tree +2· 6 companies
676. Implement Magic DictionaryVideo
Solution57.8%Medium
Depth-First Search, Design +3· 2 companies
677. Map Sum PairsVideo
Solution57.4%Medium
Design, Hash Table +2· 3 companies
678. Valid Parenthesis StringVideo
Solution42.8%Medium
Dynamic Programming, Greedy +2· 15 companies
681. Next Closest TimeVideoPremium
Solution46.8%Medium
Backtracking, Enumeration +2· 1 company
684. Redundant ConnectionVideo
Solution68.0%Medium
Breadth-First Search, Depth-First Search +2· 8 companies
686. Repeated String MatchVideo
Solution39.7%Medium
String, String Matching· 6 companies
687. Longest Univalue PathVideo
Solution44.3%Medium
Binary Tree, Depth-First Search +1· 7 companies
688. Knight Probability in ChessboardVideo
Solution57.0%Medium
Dynamic Programming· 6 companies
690. Employee ImportanceVideo
Solution69.4%Medium
Array, Breadth-First Search +3· 6 companies
692. Top K Frequent WordsVideo
Solution60.6%Medium
Bucket Sort, Counting +5· 23 companies
694. Number of Distinct IslandsVideoPremium
Solution62.8%Medium
Breadth-First Search, Depth-First Search +3· 12 companies
695. Max Area of IslandVideo
Solution73.9%Medium
Array, Breadth-First Search +3· 20 companies
698. Partition to K Equal Sum SubsetsVideo
Solution38.6%Medium
Array, Backtracking +4· 8 companies
701. Insert into a Binary Search TreeVideo
Solution73.6%Medium
Binary Search Tree, Binary Tree +1· 7 companies
702. Search in a Sorted Array of Unknown SizeVideoPremium
Solution73.1%Medium
Array, Binary Search +1· 1 company
Showing 351–400 of 2,093