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Problems

208 problems

Has videoPremium onlyReset
Array1,212Hash Table473String437Math331Greedy330Dynamic Programming327Sorting302Depth-First Search208Binary Search189Breadth-First Search166Matrix163Tree158Prefix Sum155Two Pointers150Database137All topics

Medium · 208 results

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TitleSolutionAcceptDifficultyTopics
545. Boundary of Binary TreeVideoPremium
Solution48.0%Medium
Binary Tree, Depth-First Search +1· 10 companies
547. Number of ProvincesVideo
Solution70.8%Medium
Breadth-First Search, Depth-First Search +2· 9 companies
549. Binary Tree Longest Consecutive Sequence IIVideoPremium
Solution50.1%Medium
Binary Tree, Depth-First Search +1· 3 companies
565. Array NestingVideo
Solution56.6%Medium
Array, Depth-First Search· 3 companies
582. Kill ProcessVideoPremium
Solution70.4%Medium
Array, Breadth-First Search +3· 4 companies
606. Construct String from Binary TreeVideo
Solution70.6%Medium
Binary Tree, Depth-First Search +2· 3 companies
623. Add One Row to TreeVideo
Solution64.1%Medium
Binary Tree, Breadth-First Search +2· 3 companies
652. Find Duplicate SubtreesVideo
Solution60.6%Medium
Binary Tree, Depth-First Search +2· 8 companies
655. Print Binary TreeVideo
Solution67.1%Medium
Binary Tree, Breadth-First Search +2· 5 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
666. Path Sum IVVideoPremium
Solution62.5%Medium
Array, Binary Tree +3· 1 company
669. Trim a Binary Search TreeVideo
Solution66.9%Medium
Binary Search Tree, Binary Tree +2· 4 companies
672. Bulb Switcher IIVideo
Solution51.2%Medium
Bit Manipulation, Breadth-First Search +2· 1 company
676. Implement Magic DictionaryVideo
Solution57.8%Medium
Depth-First Search, Design +3· 2 companies
684. Redundant ConnectionVideo
Solution68.0%Medium
Breadth-First Search, Depth-First Search +2· 8 companies
687. Longest Univalue PathVideo
Solution44.3%Medium
Binary Tree, Depth-First Search +1· 7 companies
690. Employee ImportanceVideo
Solution69.4%Medium
Array, Breadth-First Search +3· 6 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
721. Accounts MergeVideo
Solution62.2%Medium
Array, Breadth-First Search +5· 17 companies
737. Sentence Similarity IIVideoPremium
Solution51.2%Medium
Array, Breadth-First Search +4· 4 companies
742. Closest Leaf in a Binary TreeVideoPremium
Solution47.4%Medium
Binary Tree, Breadth-First Search +2· 3 companies
743. Network Delay TimeVideo
Solution61.7%Medium
Breadth-First Search, Depth-First Search +3· 9 companies
756. Pyramid Transition MatrixVideo
Solution60.6%Medium
Bit Manipulation, Breadth-First Search +1· 3 companies
785. Is Graph Bipartite?Video
Solution59.6%Medium
Breadth-First Search, Depth-First Search +2· 11 companies
787. Cheapest Flights Within K StopsVideo
Solution42.7%Medium
Breadth-First Search, Depth-First Search +4· 18 companies
797. All Paths From Source to TargetVideo
Solution83.6%Medium
Backtracking, Breadth-First Search +2· 5 companies
802. Find Eventual Safe StatesVideo
Solution71.6%Medium
Breadth-First Search, Depth-First Search +2· 7 companies
814. Binary Tree PruningVideo
Solution72.3%Medium
Binary Tree, Depth-First Search +1· 5 companies
841. Keys and RoomsVideo
Solution76.2%Medium
Breadth-First Search, Depth-First Search +1· 10 companies
851. Loud and RichVideo
Solution63.9%Medium
Array, Depth-First Search +2· 6 companies
863. All Nodes Distance K in Binary TreeVideo
Solution68.1%Medium
Binary Tree, Breadth-First Search +3· 16 companies
865. Smallest Subtree with all the Deepest NodesVideo
Solution77.5%Medium
Binary Tree, Breadth-First Search +3· 4 companies
886. Possible BipartitionVideo
Solution53.0%Medium
Breadth-First Search, Depth-First Search +2· 11 companies
934. Shortest BridgeVideo
Solution59.9%Medium
Array, Breadth-First Search +2· 16 companies
947. Most Stones Removed with Same Row or ColumnVideo
Solution63.4%Medium
Depth-First Search, Graph +2· 10 companies
951. Flip Equivalent Binary TreesVideo
Solution69.8%Medium
Binary Tree, Depth-First Search +1· 4 companies
959. Regions Cut By SlashesVideo
Solution77.8%Medium
Array, Breadth-First Search +4· 6 companies
971. Flip Binary Tree To Match Preorder TraversalVideo
Solution51.9%Medium
Binary Tree, Depth-First Search +1
979. Distribute Coins in Binary TreeVideo
Solution77.2%Medium
Binary Tree, Depth-First Search +1· 8 companies
988. Smallest String Starting From LeafVideo
Solution61.2%Medium
Backtracking, Binary Tree +3· 2 companies
1020. Number of EnclavesVideo
Solution72.2%Medium
Array, Breadth-First Search +3· 5 companies
1026. Maximum Difference Between Node and AncestorVideo
Solution78.1%Medium
Binary Tree, Depth-First Search +1· 5 companies
1034. Coloring A BorderVideo
Solution51.8%Medium
Array, Breadth-First Search +2· 3 companies
1038. Binary Search Tree to Greater Sum TreeVideo
Solution88.3%Medium
Binary Search Tree, Binary Tree +2· 3 companies
1042. Flower Planting With No AdjacentVideo
Solution54.1%Medium
Breadth-First Search, Depth-First Search +1· 2 companies
1080. Insufficient Nodes in Root to Leaf PathsVideo
Solution55.6%Medium
Binary Tree, Depth-First Search +1· 1 company
1102. Path With Maximum Minimum ValueVideoPremium
Solution54.6%Medium
Array, Binary Search +5· 3 companies
1110. Delete Nodes And Return ForestVideo
Solution72.4%Medium
Array, Binary Tree +3· 4 companies
Showing 51–100 of 208