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Array1,212 Hash Table473 String437 Math331 Greedy330 Dynamic Programming327 Sorting302 Depth-First Search208 Binary Search189 Breadth-First Search166 Matrix163 Tree158 Prefix Sum155 Two Pointers150 Database137 All topics

Medium · 158 results

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TitleSolutionAcceptDifficultyTopics

1443. Minimum Time to Collect All Apples in a TreeVideo

Solution63.6%Medium

Breadth-First Search, Depth-First Search +2· 4 companies

1448. Count Good Nodes in Binary TreeVideo

Solution73.8%Medium

Binary Tree, Breadth-First Search +2· 7 companies

1457. Pseudo-Palindromic Paths in a Binary TreeVideo

Solution68.3%Medium

Binary Tree, Bit Manipulation +3· 2 companies

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

1519. Number of Nodes in the Sub-Tree With the Same LabelVideo

Solution55.5%Medium

Breadth-First Search, Counting +3· 2 companies

1522. Diameter of N-Ary TreeVideoPremium

Solution75.4%Medium

Depth-First Search, Tree· 3 companies

1530. Number of Good Leaf Nodes PairsVideo

Solution71.9%Medium

Binary Tree, Depth-First Search +1· 3 companies

1586. Binary Search Tree Iterator IIVideoPremium

Solution63.4%Medium

Binary Search Tree, Binary Tree +4· 1 company

1600. Throne InheritanceVideo

Solution68.2%Medium

Depth-First Search, Design +2· 2 companies

1602. Find Nearest Right Node in Binary TreeVideoPremium

Solution75.2%Medium

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

1609. Even Odd TreeVideo

Solution67.1%Medium

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

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

1993. Operations on TreeVideo

Solution46.3%Medium

Array, Breadth-First Search +4· 3 companies

2049. Count Nodes With the Highest ScoreVideo

Solution52.6%Medium

Array, Binary Tree +2· 3 companies

2096. Step-By-Step Directions From a Binary Tree Node to AnotherVideo

Solution56.3%Medium

Binary Tree, Depth-First Search +2· 6 companies

2196. Create Binary Tree From DescriptionsVideo

Solution83.9%Medium

Array, Binary Tree +2· 7 companies

2265. Count Nodes Equal to Average of SubtreeVideo

Solution88.6%Medium

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

2368. Reachable Nodes With RestrictionsVideo

Solution60.8%Medium

Array, Breadth-First Search +5· 2 companies

2378. Choose Edges to Maximize Score in a TreeVideoPremium

Solution57.1%Medium

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

2385. Amount of Time for Binary Tree to Be InfectedVideo

Solution65.8%Medium

Binary Tree, Breadth-First Search +3· 12 companies

2415. Reverse Odd Levels of Binary TreeVideo

Solution86.7%Medium

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

2445. Number of Nodes With Value OneVideoPremium

Solution66.3%Medium

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

2467. Most Profitable Path in a TreeVideo

Solution67.3%Medium

Array, Breadth-First Search +3· 6 companies

2471. Minimum Number of Operations to Sort a Binary Tree by LevelVideo

Solution74.2%Medium

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

2476. Closest Nodes Queries in a Binary Search TreeVideo

Solution44.9%Medium

Array, Binary Search +4· 1 company

2477. Minimum Fuel Cost to Report to the CapitalVideo

Solution65.0%Medium

Breadth-First Search, Depth-First Search +2· 5 companies

2583. Kth Largest Sum in a Binary TreeVideo

Solution59.4%Medium

Binary Tree, Breadth-First Search +2· 5 companies

2641. Cousins in Binary Tree IIVideo

Solution75.8%Medium

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

2673. Make Costs of Paths Equal in a Binary TreeVideo

Solution57.2%Medium

Array, Binary Tree +3· 1 company

2764. Is Array a Preorder of Some ‌Binary TreeVideoPremium

Solution67.8%Medium

Binary Tree, Depth-First Search +2

2773. Height of Special Binary TreeVideoPremium

Solution75.2%Medium

Binary Tree, Breadth-First Search +2

2925. Maximum Score After Applying Operations on a TreeVideo

Solution47.2%Medium

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

3004. Maximum Subtree of the Same ColorVideoPremium

Solution59.2%Medium

Array, Depth-First Search +2· 2 companies

3067. Count Pairs of Connectable Servers in a Weighted Tree NetworkVideo

Solution55.6%Medium

Array, Depth-First Search +1· 2 companies

3157. Find the Level of Tree with Minimum SumVideoPremium

Solution69.6%Medium

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

3249. Count the Number of Good NodesVideo

Solution55.0%Medium

Depth-First Search, Tree

3319. K-th Largest Perfect Subtree Size in Binary TreeVideo

Solution61.6%Medium

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

3331. Find Subtree Sizes After ChangesVideo

Solution52.8%Medium

Array, Depth-First Search +3

3372. Maximize the Number of Target Nodes After Connecting Trees IVideo

Solution69.5%Medium

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

Showing 101–150 of 158