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Problems

338 problems

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

338 results

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TitleSolutionAcceptDifficultyTopics
366. Find Leaves of Binary TreeVideoPremium
Solution81.4%Medium
Binary Tree, Depth-First Search +1· 6 companies
385. Mini ParserVideo
Solution44.0%Medium
Depth-First Search, Stack +1· 4 companies
386. Lexicographical NumbersVideo
Solution76.2%Medium
Depth-First Search, Trie· 6 companies
388. Longest Absolute File PathVideo
Solution49.9%Medium
Depth-First Search, Stack +1· 4 companies
399. Evaluate DivisionVideo
Solution64.7%Medium
Array, Breadth-First Search +5· 23 companies
404. Sum of Left LeavesVideo
Solution63.1%Easy
Binary Tree, Breadth-First Search +2· 6 companies
417. Pacific Atlantic Water FlowVideo
Solution61.3%Medium
Array, Breadth-First Search +2· 11 companies
419. Battleships in a BoardVideo
Solution77.4%Medium
Array, Depth-First Search +1· 8 companies
426. Convert Binary Search Tree to Sorted Doubly Linked ListVideoPremium
Solution65.2%Medium
Binary Search Tree, Binary Tree +5· 4 companies
428. Serialize and Deserialize N-ary TreeVideoPremium
Solution68.7%Hard
Breadth-First Search, Depth-First Search +2· 7 companies
430. Flatten a Multilevel Doubly Linked ListVideo
Solution63.3%Medium
Depth-First Search, Doubly-Linked List +1· 6 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
463. Island PerimeterVideo
Solution74.3%Easy
Array, Breadth-First Search +2· 9 companies
472. Concatenated WordsVideo
Solution49.9%Hard
Array, Depth-First Search +3· 3 companies
490. The MazeVideoPremium
Solution60.4%Medium
Array, Breadth-First Search +2· 13 companies
499. The Maze IIIVideoPremium
Solution52.3%Hard
Array, Breadth-First Search +6· 1 company
501. Find Mode in Binary Search TreeVideo
Solution59.2%Easy
Binary Search Tree, Binary Tree +2· 4 companies
505. The Maze IIVideoPremium
Solution55.0%Medium
Array, Breadth-First Search +5· 5 companies
508. Most Frequent Subtree SumVideo
Solution69.6%Medium
Binary Tree, Depth-First Search +2· 3 companies
513. Find Bottom Left Tree ValueVideo
Solution72.2%Medium
Binary Tree, Breadth-First Search +2· 7 companies
514. Freedom TrailVideo
Solution59.4%Hard
Breadth-First Search, Depth-First Search +2· 3 companies
515. Find Largest Value in Each Tree RowVideo
Solution66.3%Medium
Binary Tree, Breadth-First Search +2· 8 companies
529. MinesweeperVideo
Solution68.7%Medium
Array, Breadth-First Search +2· 9 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
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
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
565. Array NestingVideo
Solution56.6%Medium
Array, Depth-First Search· 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
642. Design Search Autocomplete SystemVideoPremium
Solution49.9%Hard
Data Stream, Depth-First Search +5· 12 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
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
Showing 51–100 of 338