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208 problems

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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 · 208 results

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TitleSolutionAcceptDifficultyTopics

1120. Maximum Average SubtreeVideoPremium

Solution66.7%Medium

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

1123. Lowest Common Ancestor of Deepest LeavesVideo

Solution79.5%Medium

Binary Tree, Breadth-First Search +3· 4 companies

1145. Binary Tree Coloring GameVideo

Solution52.9%Medium

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

1161. Maximum Level Sum of a Binary TreeVideo

Solution70.0%Medium

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

1202. Smallest String With SwapsVideo

Solution61.0%Medium

Array, Breadth-First Search +5· 8 companies

1214. Two Sum BSTsVideoPremium

Solution68.2%Medium

Binary Search, Binary Search Tree +5· 1 company

1233. Remove Sub-Folders from the FilesystemVideo

Solution78.6%Medium

Array, Depth-First Search +2· 8 companies

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

1254. Number of Closed IslandsVideo

Solution67.7%Medium

Array, Breadth-First Search +3· 5 companies

1257. Smallest Common RegionVideoPremium

Solution68.6%Medium

Array, Breadth-First Search +4· 1 company

1261. Find Elements in a Contaminated Binary TreeVideo

Solution84.1%Medium

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

1267. Count Servers that CommunicateVideo

Solution73.5%Medium

Array, Breadth-First Search +4· 6 companies

1273. Delete Tree NodesVideoPremium

Solution61.2%Medium

Array, Breadth-First Search +2· 1 company

1302. Deepest Leaves SumVideo

Solution86.3%Medium

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

1305. All Elements in Two Binary Search TreesVideo

Solution80.5%Medium

Binary Search Tree, Binary Tree +3· 2 companies

1306. Jump Game IIIVideo

Solution70.1%Medium

Array, Breadth-First Search +1· 3 companies

1315. Sum of Nodes with Even-Valued GrandparentVideo

Solution85.6%Medium

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

1319. Number of Operations to Make Network ConnectedVideo

Solution67.0%Medium

Breadth-First Search, Depth-First Search +2· 10 companies

1325. Delete Leaves With a Given ValueVideo

Solution77.4%Medium

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

1339. Maximum Product of Splitted Binary TreeVideo

Solution55.7%Medium

Binary Tree, Depth-First Search +1· 5 companies

1361. Validate Binary Tree NodesVideo

Solution44.3%Medium

Binary Tree, Breadth-First Search +4· 3 companies

1367. Linked List in Binary TreeVideo

Solution52.1%Medium

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

1372. Longest ZigZag Path in a Binary TreeVideo

Solution67.0%Medium

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

1376. Time Needed to Inform All EmployeesVideo

Solution60.6%Medium

Breadth-First Search, Depth-First Search +1· 5 companies

1382. Balance a Binary Search TreeVideo

Solution86.3%Medium

Binary Search Tree, Binary Tree +4· 5 companies

1391. Check if There is a Valid Path in a GridVideo

Solution64.5%Medium

Array, Breadth-First Search +3· 3 companies

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

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

1462. Course Schedule IVVideo

Solution60.4%Medium

Breadth-First Search, Depth-First Search +2· 6 companies

1466. Reorder Routes to Make All Paths Lead to the City ZeroVideo

Solution65.7%Medium

Breadth-First Search, Depth-First Search +1· 5 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

1559. Detect Cycles in 2D GridVideo

Solution63.2%Medium

Array, Breadth-First Search +3· 6 companies

1600. Throne InheritanceVideo

Solution68.2%Medium

Depth-First Search, Design +2· 2 companies

1612. Check If Two Expression Trees are EquivalentVideoPremium

Solution71.8%Medium

Binary Tree, Counting +3· 1 company

1625. Lexicographically Smallest String After Applying OperationsVideo

Solution79.4%Medium

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

1631. Path With Minimum EffortVideo

Solution64.1%Medium

Array, Binary Search +5· 9 companies

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

1722. Minimize Hamming Distance After Swap OperationsVideo

Solution69.6%Medium

Array, Depth-First Search +1· 3 companies

Showing 101–150 of 208