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90 problems

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Graph 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 · 90 results

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TitleSolutionAcceptDifficultyTopics

133. Clone GraphVideo

Solution66.1%Medium

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

277. Find the CelebrityVideoPremium

Solution48.9%Medium

Graph, Interactive +1· 12 companies

310. Minimum Height TreesVideo

Solution42.4%Medium

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

323. Number of Connected Components in an Undirected GraphVideoPremium

Solution64.9%Medium

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

399. Evaluate DivisionVideo

Solution64.7%Medium

Array, Breadth-First Search +5· 23 companies

444. Sequence ReconstructionVideoPremium

Solution31.2%Medium

Array, Graph +1· 2 companies

505. The Maze IIVideoPremium

Solution55.0%Medium

Array, Breadth-First Search +5· 5 companies

547. Number of ProvincesVideo

Solution70.8%Medium

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

684. Redundant ConnectionVideo

Solution68.0%Medium

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

743. Network Delay TimeVideo

Solution61.7%Medium

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

797. All Paths From Source to TargetVideo

Solution83.6%Medium

Backtracking, Breadth-First Search +2· 5 companies

802. Find Eventual Safe StatesVideo

Solution71.6%Medium

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

841. Keys and RoomsVideo

Solution76.2%Medium

Breadth-First Search, Depth-First Search +1· 10 companies

851. Loud and RichVideo

Solution63.9%Medium

Array, Depth-First Search +2· 6 companies

886. Possible BipartitionVideo

Solution53.0%Medium

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

947. Most Stones Removed with Same Row or ColumnVideo

Solution63.4%Medium

Depth-First Search, Graph +2· 10 companies

990. Satisfiability of Equality EquationsVideo

Solution52.2%Medium

Array, Graph +2· 6 companies

1042. Flower Planting With No AdjacentVideo

Solution54.1%Medium

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

1059. All Paths from Source Lead to DestinationVideoPremium

Solution37.2%Medium

Graph, Topological Sort· 1 company

1129. Shortest Path with Alternating ColorsVideo

Solution48.4%Medium

Breadth-First Search, Graph· 5 companies

1135. Connecting Cities With Minimum CostVideoPremium

Solution63.5%Medium

Graph, Heap (Priority Queue) +2· 1 company

1136. Parallel CoursesVideoPremium

Solution62.1%Medium

Graph, Topological Sort· 7 companies

1245. Tree DiameterVideoPremium

Solution61.1%Medium

Breadth-First Search, Depth-First Search +3· 7 companies

1311. Get Watched Videos by Your FriendsVideo

Solution54.2%Medium

Array, Breadth-First Search +3· 3 companies

1319. Number of Operations to Make Network ConnectedVideo

Solution67.0%Medium

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

1334. Find the City With the Smallest Number of Neighbors at a Threshold DistanceVideo

Solution73.5%Medium

Dynamic Programming, Graph +1· 5 companies

1361. Validate Binary Tree NodesVideo

Solution44.3%Medium

Binary Tree, Breadth-First Search +4· 3 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

1514. Path with Maximum ProbabilityVideo

Solution65.9%Medium

Array, Graph +2· 5 companies

1557. Minimum Number of Vertices to Reach All NodesVideo

Solution81.6%Medium

Graph· 4 companies

1584. Min Cost to Connect All PointsVideo

Solution71.7%Medium

Array, Graph +2· 10 companies

1615. Maximal Network RankVideo

Solution65.9%Medium

Graph· 1 company

1778. Shortest Path in a Hidden GridVideoPremium

Solution44.5%Medium

Breadth-First Search, Depth-First Search +2· 3 companies

1786. Number of Restricted Paths From First to Last NodeVideo

Solution41.6%Medium

Dynamic Programming, Graph +3· 1 company

1810. Minimum Path Cost in a Hidden GridVideoPremium

Solution58.7%Medium

Breadth-First Search, Depth-First Search +3· 2 companies

1820. Maximum Number of Accepted InvitationsVideoPremium

Solution52.4%Medium

Array, Depth-First Search +2· 2 companies

1976. Number of Ways to Arrive at DestinationVideo

Solution37.4%Medium

Dynamic Programming, Graph +2· 5 companies

2039. The Time When the Network Becomes IdleVideo

Solution56.1%Medium

Array, Breadth-First Search +1· 3 companies

2077. Paths in Maze That Lead to Same RoomVideoPremium

Solution56.7%Medium

Graph· 1 company

2093. Minimum Cost to Reach City With DiscountsVideoPremium

Solution62.4%Medium

Graph, Heap (Priority Queue) +1· 2 companies

2101. Detonate the Maximum BombsVideo

Solution50.0%Medium

Array, Breadth-First Search +4· 7 companies

2115. Find All Possible Recipes from Given SuppliesVideo

Solution56.8%Medium

Array, Graph +3· 10 companies

2192. All Ancestors of a Node in a Directed Acyclic GraphVideo

Solution62.1%Medium

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

2285. Maximum Total Importance of RoadsVideo

Solution69.3%Medium

Graph, Greedy +2· 1 company

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