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17 problems

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Binary Tree Array578 Dynamic Programming332 String191 Math187 Binary Search136 Hash Table134 Sorting106 Greedy104 Bit Manipulation103 Graph96 Depth-First Search91 Heap (Priority Queue)78 Prefix Sum77 Matrix75 Breadth-First Search71 All topics

Hard · 17 results

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TitleSolutionAcceptDifficultyTopics

124. Binary Tree Maximum Path SumVideo

Solution42.7%Hard

Binary Tree, Depth-First Search +2· 25 companies

272. Closest Binary Search Tree Value IIVideoPremium

Solution61.1%Hard

Binary Search Tree, Binary Tree +5· 3 companies

297. Serialize and Deserialize Binary TreeVideo

Solution61.1%Hard

Binary Tree, Breadth-First Search +4· 23 companies

431. Encode N-ary Tree to Binary TreeVideoPremium

Solution80.6%Hard

Binary Tree, Breadth-First Search +3

968. Binary Tree CamerasVideo

Solution48.3%Hard

Binary Tree, Depth-First Search +2· 14 companies

987. Vertical Order Traversal of a Binary TreeVideo

Solution54.6%Hard

Binary Tree, Breadth-First Search +4· 15 companies

1028. Recover a Tree From Preorder TraversalVideo

Solution83.2%Hard

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

1373. Maximum Sum BST in Binary TreeVideo

Solution48.9%Hard

Binary Search Tree, Binary Tree +3· 5 companies

1569. Number of Ways to Reorder Array to Get Same BSTVideo

Solution65.8%Hard

Array, Binary Search Tree +8· 2 companies

1597. Build Binary Expression Tree From Infix ExpressionVideoPremium

–62.5%Hard

Binary Tree, Stack +2· 1 company

1932. Merge BSTs to Create Single BSTVideo

Solution40.3%Hard

Binary Search, Binary Tree +3· 3 companies

2005. Subtree Removal Game with Fibonacci TreeVideoPremium

–54.9%Hard

Binary Tree, Dynamic Programming +3· 1 company

2313. Minimum Flips in Binary Tree to Get ResultVideoPremium

Solution56.9%Hard

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

2458. Height of Binary Tree After Subtree Removal QueriesVideo

Solution55.0%Hard

Array, Binary Tree +3· 3 companies

2509. Cycle Length Queries in a TreeVideo

Solution60.9%Hard

Array, Binary Tree +1· 1 company

2792. Count Nodes That Are Great EnoughVideoPremium

Solution57.1%Hard

Binary Tree, Depth-First Search +2

3526. Range XOR Queries with Subarray ReversalsPremium

–62.4%Hard

Array, Binary Tree +1

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