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Problems

264 problems

Has videoPremium onlyReset
Array2,237String877Hash Table797Math691Dynamic Programming673Sorting508Greedy485Binary Search357Depth-First Search338Database308Bit Manipulation286Matrix279Tree264Breadth-First Search257Prefix Sum252All topics

264 results

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TitleSolutionAcceptDifficultyTopics
427. Construct Quad TreeVideo
Solution78.8%Medium
Array, Divide and Conquer +2· 8 companies
428. Serialize and Deserialize N-ary TreeVideoPremium
Solution68.7%Hard
Breadth-First Search, Depth-First Search +2· 7 companies
429. N-ary Tree Level Order TraversalVideo
Solution71.6%Medium
Breadth-First Search, Tree· 3 companies
431. Encode N-ary Tree to Binary TreeVideoPremium
Solution80.6%Hard
Binary Tree, Breadth-First Search +3
437. Path Sum IIIVideo
Solution46.6%Medium
Binary Tree, Depth-First Search +1· 11 companies
449. Serialize and Deserialize BSTVideo
Solution60.1%Medium
Binary Search Tree, Binary Tree +5· 4 companies
450. Delete Node in a BSTVideo
Solution55.1%Medium
Binary Search Tree, Binary Tree +1· 11 companies
501. Find Mode in Binary Search TreeVideo
Solution59.2%Easy
Binary Search Tree, Binary Tree +2· 4 companies
508. Most Frequent Subtree SumVideo
Solution69.6%Medium
Binary Tree, Depth-First Search +2· 3 companies
510. Inorder Successor in BST IIVideoPremium
Solution60.9%Medium
Binary Search Tree, Binary Tree +1· 3 companies
513. Find Bottom Left Tree ValueVideo
Solution72.2%Medium
Binary Tree, Breadth-First Search +2· 7 companies
515. Find Largest Value in Each Tree RowVideo
Solution66.3%Medium
Binary Tree, Breadth-First Search +2· 8 companies
530. Minimum Absolute Difference in BSTVideo
Solution59.3%Easy
Binary Search Tree, Binary Tree +3· 3 companies
536. Construct Binary Tree from StringVideoPremium
Solution58.7%Medium
Binary Tree, Depth-First Search +3· 3 companies
538. Convert BST to Greater TreeVideo
Solution72.1%Medium
Binary Search Tree, Binary Tree +2· 4 companies
543. Diameter of Binary TreeVideo
Solution66.4%Easy
Binary Tree, Depth-First Search +1· 20 companies
545. Boundary of Binary TreeVideoPremium
Solution48.0%Medium
Binary Tree, Depth-First Search +1· 10 companies
549. Binary Tree Longest Consecutive Sequence IIVideoPremium
Solution50.1%Medium
Binary Tree, Depth-First Search +1· 3 companies
558. Logical OR of Two Binary Grids Represented as Quad-TreesVideo
Solution53.9%Medium
Divide and Conquer, Tree
559. Maximum Depth of N-ary TreeVideo
Solution73.5%Easy
Breadth-First Search, Depth-First Search +1· 2 companies
563. Binary Tree TiltVideo
Solution66.2%Easy
Binary Tree, Depth-First Search +1· 3 companies
572. Subtree of Another TreeVideo
Solution52.0%Easy
Binary Tree, Depth-First Search +3· 8 companies
582. Kill ProcessVideoPremium
Solution70.4%Medium
Array, Breadth-First Search +3· 4 companies
589. N-ary Tree Preorder TraversalVideo
Solution76.7%Easy
Depth-First Search, Stack +1· 2 companies
590. N-ary Tree Postorder TraversalVideo
Solution81.0%Easy
Depth-First Search, Stack +1· 3 companies
606. Construct String from Binary TreeVideo
Solution70.6%Medium
Binary Tree, Depth-First Search +2· 3 companies
617. Merge Two Binary TreesVideo
Solution79.2%Easy
Binary Tree, Breadth-First Search +2· 8 companies
623. Add One Row to TreeVideo
Solution64.1%Medium
Binary Tree, Breadth-First Search +2· 3 companies
637. Average of Levels in Binary TreeVideo
Solution74.8%Easy
Binary Tree, Breadth-First Search +2· 4 companies
652. Find Duplicate SubtreesVideo
Solution60.6%Medium
Binary Tree, Depth-First Search +2· 8 companies
653. Two Sum IV - Input is a BSTVideo
Solution63.7%Easy
Binary Search Tree, Binary Tree +5· 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
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
671. Second Minimum Node In a Binary TreeVideo
Solution46.0%Easy
Binary Tree, Depth-First Search +1· 2 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
700. Search in a Binary Search TreeVideo
Solution83.1%Easy
Binary Search Tree, Binary Tree +1· 5 companies
701. Insert into a Binary Search TreeVideo
Solution73.6%Medium
Binary Search Tree, Binary Tree +1· 7 companies
703. Kth Largest Element in a StreamVideo
Solution61.4%Easy
Binary Search Tree, Binary Tree +4· 11 companies
742. Closest Leaf in a Binary TreeVideoPremium
Solution47.4%Medium
Binary Tree, Breadth-First Search +2· 3 companies
776. Split BSTVideoPremium
Solution82.5%Medium
Binary Search Tree, Binary Tree +2· 2 companies
783. Minimum Distance Between BST NodesVideo
Solution61.8%Easy
Binary Search Tree, Binary Tree +3· 4 companies
814. Binary Tree PruningVideo
Solution72.3%Medium
Binary Tree, Depth-First Search +1· 5 companies
834. Sum of Distances in TreeVideo
Solution65.8%Hard
Depth-First Search, Dynamic Programming +2· 5 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
Showing 51–100 of 264