Practice problems across 75+ categories
Practice problems frequently asked at Graph • 169 problems | 3 Easy | 79 Medium | 85 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 16 | Connecting Cities With Minimum Cost | Medium | Union FindGraphHeap (Priority Queue) |
| 17 | Construct 2D Grid Matching Graph Layout | Hard | ArrayHash TableGraph |
| 18 | Count Pairs Of Nodes | Hard | ArrayHash TableTwo Pointers |
| 19 | Count the Number of Complete Components | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 20 | Count the Number of Houses at a Certain Distance I | Medium | Breadth-First SearchGraphPrefix Sum |
| 21 | Count the Number of Houses at a Certain Distance II | Hard | GraphPrefix Sum |
| 22 | Count Unreachable Pairs of Nodes in an Undirected Graph | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 23 | Count Visited Nodes in a Directed Graph | Hard | Dynamic ProgrammingGraphMemoization |
| 24 | Count Ways to Build Rooms in an Ant Colony | Hard | MathDynamic ProgrammingTree |
| 25 | Couples Holding Hands | Hard | GreedyDepth-First SearchBreadth-First Search |
| 26 | Course Schedule | Medium | Depth-First SearchBreadth-First SearchGraph |
| 27 | Course Schedule II | Medium | Depth-First SearchBreadth-First SearchGraph |
| 28 | Course Schedule IV | Medium | Depth-First SearchBreadth-First SearchGraph |
| 29 | Cracking the Safe | Hard | Depth-First SearchGraphEulerian Circuit |
| 30 | Critical Connections in a Network | Hard | Depth-First SearchGraphBiconnected Component |
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