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Array194 Database104 Hash Table83 String71 Depth-First Search57 Dynamic Programming49 Tree48 Math45 Sorting43 Breadth-First Search40 Greedy40 Binary Tree38 Binary Search31 Two Pointers29 Matrix28 All topics

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TitleSolutionAcceptDifficultyTopics

156. Binary Tree Upside DownVideoPremium

Solution65.4%Medium

Binary Tree, Depth-First Search +1· 2 companies

250. Count Univalue SubtreesVideoPremium

Solution57.5%Medium

Binary Tree, Depth-First Search +1· 4 companies

261. Graph Valid TreeVideoPremium

Solution49.9%Medium

Breadth-First Search, Depth-First Search +2· 9 companies

285. Inorder Successor in BSTVideoPremium

Solution51.2%Medium

Binary Search Tree, Binary Tree +2· 6 companies

298. Binary Tree Longest Consecutive SequenceVideoPremium

Solution54.7%Medium

Binary Tree, Depth-First Search +1· 4 companies

314. Binary Tree Vertical Order TraversalVideoPremium

Solution57.8%Medium

Binary Tree, Breadth-First Search +4· 9 companies

323. Number of Connected Components in an Undirected GraphVideoPremium

Solution64.9%Medium

Breadth-First Search, Depth-First Search +2· 7 companies

333. Largest BST SubtreeVideoPremium

Solution45.8%Medium

Binary Search Tree, Binary Tree +3· 2 companies

339. Nested List Weight SumVideoPremium

Solution85.9%Medium

Breadth-First Search, Depth-First Search· 6 companies

364. Nested List Weight Sum IIVideoPremium

Solution66.8%Medium

Breadth-First Search, Depth-First Search +1· 3 companies

366. Find Leaves of Binary TreeVideoPremium

Solution81.4%Medium

Binary Tree, Depth-First Search +1· 6 companies

426. Convert Binary Search Tree to Sorted Doubly Linked ListVideoPremium

Solution65.2%Medium

Binary Search Tree, Binary Tree +5· 4 companies

490. The MazeVideoPremium

Solution60.4%Medium

Array, Breadth-First Search +2· 13 companies

505. The Maze IIVideoPremium

Solution55.0%Medium

Array, Breadth-First Search +5· 5 companies

536. Construct Binary Tree from StringVideoPremium

Solution58.7%Medium

Binary Tree, Depth-First Search +3· 3 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

582. Kill ProcessVideoPremium

Solution70.4%Medium

Array, Breadth-First Search +3· 4 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

694. Number of Distinct IslandsVideoPremium

Solution62.8%Medium

Breadth-First Search, Depth-First Search +3· 12 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

1102. Path With Maximum Minimum ValueVideoPremium

Solution54.6%Medium

Array, Binary Search +5· 3 companies

1120. Maximum Average SubtreeVideoPremium

Solution66.7%Medium

Binary Tree, Depth-First Search +1· 1 company

1214. Two Sum BSTsVideoPremium

Solution68.2%Medium

Binary Search, Binary Search Tree +5· 1 company

1236. Web CrawlerVideoPremium

Solution68.8%Medium

Breadth-First Search, Depth-First Search +2· 7 companies

1242. Web Crawler MultithreadedVideoPremium

–49.5%Medium

Breadth-First Search, Concurrency +1· 9 companies

1245. Tree DiameterVideoPremium

Solution61.1%Medium

Breadth-First Search, Depth-First Search +3· 7 companies

1257. Smallest Common RegionVideoPremium

Solution68.6%Medium

Array, Breadth-First Search +4· 1 company

1273. Delete Tree NodesVideoPremium

Solution61.2%Medium

Array, Breadth-First Search +2· 1 company

1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary TreeVideoPremium

Solution47.6%Medium

Binary Tree, Breadth-First Search +2

1485. Clone Binary Tree With Random PointerVideoPremium

Solution81.2%Medium

Binary Tree, Breadth-First Search +3· 2 companies

1490. Clone N-ary TreeVideoPremium

Solution83.2%Medium

Breadth-First Search, Depth-First Search +2· 1 company

1506. Find Root of N-Ary TreeVideoPremium

Solution78.4%Medium

Bit Manipulation, Depth-First Search +2· 3 companies

1522. Diameter of N-Ary TreeVideoPremium

Solution75.4%Medium

Depth-First Search, Tree· 3 companies

1612. Check If Two Expression Trees are EquivalentVideoPremium

Solution71.8%Medium

Binary Tree, Counting +3· 1 company

1644. Lowest Common Ancestor of a Binary Tree IIVideoPremium

Solution69.6%Medium

Binary Tree, Depth-First Search +1· 4 companies

1660. Correct a Binary TreeVideoPremium

Solution74.3%Medium

Binary Tree, Breadth-First Search +3· 1 company

1666. Change the Root of a Binary TreeVideoPremium

Solution74.4%Medium

Binary Tree, Depth-First Search +1· 1 company

1676. Lowest Common Ancestor of a Binary Tree IVVideoPremium

Solution79.6%Medium

Binary Tree, Depth-First Search +2· 4 companies

1740. Find Distance in a Binary TreeVideoPremium

Solution74.3%Medium

Binary Tree, Breadth-First Search +3· 2 companies

1778. Shortest Path in a Hidden GridVideoPremium

Solution44.5%Medium

Breadth-First Search, Depth-First Search +2· 3 companies

1810. Minimum Path Cost in a Hidden GridVideoPremium

Solution58.7%Medium

Breadth-First Search, Depth-First Search +3· 2 companies

1820. Maximum Number of Accepted InvitationsVideoPremium

Solution52.4%Medium

Array, Depth-First Search +2· 2 companies

1858. Longest Word With All PrefixesVideoPremium

Solution73.1%Medium

Depth-First Search, Trie· 1 company

1973. Count Nodes Equal to Sum of DescendantsVideoPremium

Solution77.4%Medium

Binary Tree, Depth-First Search +1· 1 company

2378. Choose Edges to Maximize Score in a TreeVideoPremium

Solution57.1%Medium

Depth-First Search, Dynamic Programming +1· 1 company

2445. Number of Nodes With Value OneVideoPremium

Solution66.3%Medium

Binary Tree, Breadth-First Search +2· 1 company

2764. Is Array a Preorder of Some ‌Binary TreeVideoPremium

Solution67.8%Medium

Binary Tree, Depth-First Search +2

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