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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 · 166 results

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TitleSolutionAcceptDifficultyTopics

102. Binary Tree Level Order TraversalVideo

Solution73.5%Medium

Binary Tree, Breadth-First Search +1· 16 companies

103. Binary Tree Zigzag Level Order TraversalVideo

Solution64.4%Medium

Binary Tree, Breadth-First Search +1· 19 companies

107. Binary Tree Level Order Traversal IIVideo

Solution69.0%Medium

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

116. Populating Next Right Pointers in Each NodeVideo

Solution67.6%Medium

Binary Tree, Breadth-First Search +3· 8 companies

117. Populating Next Right Pointers in Each Node IIVideo

Solution57.9%Medium

Binary Tree, Breadth-First Search +3· 7 companies

130. Surrounded RegionsVideo

Solution46.1%Medium

Array, Breadth-First Search +3· 12 companies

133. Clone GraphVideo

Solution66.1%Medium

Breadth-First Search, Depth-First Search +2· 18 companies

199. Binary Tree Right Side ViewVideo

Solution71.5%Medium

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

200. Number of IslandsVideo

Solution65.2%Medium

Array, Breadth-First Search +3· 86 companies

207. Course ScheduleVideo

Solution52.2%Medium

Breadth-First Search, Depth-First Search +2· 45 companies

210. Course Schedule IIVideo

Solution56.3%Medium

Breadth-First Search, Depth-First Search +2· 36 companies

261. Graph Valid TreeVideoPremium

Solution49.9%Medium

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

279. Perfect SquaresVideo

Solution57.0%Medium

Breadth-First Search, Dynamic Programming +1· 12 companies

286. Walls and GatesVideoPremium

Solution63.9%Medium

Array, Breadth-First Search +1· 11 companies

310. Minimum Height TreesVideo

Solution42.4%Medium

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

314. Binary Tree Vertical Order TraversalVideoPremium

Solution57.8%Medium

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

322. Coin ChangeVideo

Solution49.3%Medium

Array, Breadth-First Search +1· 40 companies

323. Number of Connected Components in an Undirected GraphVideoPremium

Solution64.9%Medium

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

365. Water and Jug ProblemVideo

Solution46.4%Medium

Breadth-First Search, Depth-First Search +1· 8 companies

399. Evaluate DivisionVideo

Solution64.7%Medium

Array, Breadth-First Search +5· 23 companies

417. Pacific Atlantic Water FlowVideo

Solution61.3%Medium

Array, Breadth-First Search +2· 11 companies

429. N-ary Tree Level Order TraversalVideo

Solution71.6%Medium

Breadth-First Search, Tree· 3 companies

433. Minimum Genetic MutationVideo

Solution57.1%Medium

Breadth-First Search, Hash Table +1· 6 companies

449. Serialize and Deserialize BSTVideo

Solution60.1%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

513. Find Bottom Left Tree ValueVideo

Solution72.2%Medium

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

515. Find Largest Value in Each Tree RowVideo

Solution66.3%Medium

Binary Tree, Breadth-First Search +2· 8 companies

529. MinesweeperVideo

Solution68.7%Medium

Array, Breadth-First Search +2· 9 companies

542. 01 MatrixVideo

Solution54.7%Medium

Array, Breadth-First Search +2· 14 companies

547. Number of ProvincesVideo

Solution70.8%Medium

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

582. Kill ProcessVideoPremium

Solution70.4%Medium

Array, Breadth-First Search +3· 4 companies

623. Add One Row to TreeVideo

Solution64.1%Medium

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

655. Print Binary TreeVideo

Solution67.1%Medium

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

662. Maximum Width of Binary TreeVideo

Solution46.0%Medium

Binary Tree, Breadth-First Search +2· 8 companies

672. Bulb Switcher IIVideo

Solution51.2%Medium

Bit Manipulation, Breadth-First Search +2· 1 company

684. Redundant ConnectionVideo

Solution68.0%Medium

Breadth-First Search, Depth-First Search +2· 8 companies

690. Employee ImportanceVideo

Solution69.4%Medium

Array, Breadth-First Search +3· 6 companies

694. Number of Distinct IslandsVideoPremium

Solution62.8%Medium

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

695. Max Area of IslandVideo

Solution73.9%Medium

Array, Breadth-First Search +3· 20 companies

721. Accounts MergeVideo

Solution62.2%Medium

Array, Breadth-First Search +5· 17 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

743. Network Delay TimeVideo

Solution61.7%Medium

Breadth-First Search, Depth-First Search +3· 9 companies

752. Open the LockVideo

Solution61.2%Medium

Array, Breadth-First Search +2· 15 companies

756. Pyramid Transition MatrixVideo

Solution60.6%Medium

Bit Manipulation, Breadth-First Search +1· 3 companies

785. Is Graph Bipartite?Video

Solution59.6%Medium

Breadth-First Search, Depth-First Search +2· 11 companies

787. Cheapest Flights Within K StopsVideo

Solution42.7%Medium

Breadth-First Search, Depth-First Search +4· 18 companies

Showing 1–50 of 166