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Array301 Database212 Hash Table116 String116 Depth-First Search78 Math78 Dynamic Programming76 Sorting64 Tree63 Breadth-First Search53 Greedy52 Binary Search50 Binary Tree48 Two Pointers40 Matrix39 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

255. Verify Preorder Sequence in Binary Search TreeVideoPremium

Solution51.7%Medium

Array, Binary Search Tree +5· 5 companies

270. Closest Binary Search Tree ValueVideoPremium

Solution49.2%Easy

Binary Search, Binary Search Tree +3· 7 companies

272. Closest Binary Search Tree Value IIVideoPremium

Solution61.1%Hard

Binary Search Tree, Binary Tree +5· 3 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

333. Largest BST SubtreeVideoPremium

Solution45.8%Medium

Binary Search Tree, Binary Tree +3· 2 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

428. Serialize and Deserialize N-ary TreeVideoPremium

Solution68.7%Hard

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

431. Encode N-ary Tree to Binary TreeVideoPremium

Solution80.6%Hard

Binary Tree, Breadth-First Search +3

510. Inorder Successor in BST IIVideoPremium

Solution60.9%Medium

Binary Search Tree, Binary Tree +1· 3 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

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

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

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

1469. Find All The Lonely NodesVideoPremium

Solution83.8%Easy

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

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

1516. Move Sub-Tree of N-Ary TreeVideoPremium

–59.7%Hard

Depth-First Search, Tree· 1 company

1522. Diameter of N-Ary TreeVideoPremium

Solution75.4%Medium

Depth-First Search, Tree· 3 companies

1586. Binary Search Tree Iterator IIVideoPremium

Solution63.4%Medium

Binary Search Tree, Binary Tree +4· 1 company

1597. Build Binary Expression Tree From Infix ExpressionVideoPremium

–62.5%Hard

Binary Tree, Stack +2· 1 company

1602. Find Nearest Right Node in Binary TreeVideoPremium

Solution75.2%Medium

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

1612. Check If Two Expression Trees are EquivalentVideoPremium

Solution71.8%Medium

Binary Tree, Counting +3· 1 company

1628. Design an Expression Tree With Evaluate FunctionVideoPremium

Solution82.4%Medium

Array, Binary Tree +4· 1 company

1644. Lowest Common Ancestor of a Binary Tree IIVideoPremium

Solution69.6%Medium

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

1650. Lowest Common Ancestor of a Binary Tree IIIVideoPremium

Solution83.0%Medium

Binary Tree, Hash Table +2· 10 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

1902. Depth of BST Given Insertion OrderVideoPremium

Solution42.5%Medium

Array, Binary Search Tree +3

1973. Count Nodes Equal to Sum of DescendantsVideoPremium

Solution77.4%Medium

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

2005. Subtree Removal Game with Fibonacci TreeVideoPremium

–54.9%Hard

Binary Tree, Dynamic Programming +3· 1 company

2277. Closest Node to Path in TreeVideoPremium

–62.1%Hard

Array, Breadth-First Search +2· 1 company

2313. Minimum Flips in Binary Tree to Get ResultVideoPremium

Solution56.9%Hard

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

Showing 1–50 of 63