Practice problems across 75+ categories
Practice problems frequently asked at Graph • 169 problems | 3 Easy | 79 Medium | 85 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | Add Edges to Make Degrees of All Nodes Even | Hard | Hash TableGraph |
| 2 | Alien Dictionary | Hard | ArrayStringDepth-First Search |
| 3 | All Ancestors of a Node in a Directed Acyclic Graph | Medium | Depth-First SearchBreadth-First SearchGraph |
| 4 | All Paths from Source Lead to Destination | Medium | GraphTopological Sort |
| 5 | All Paths From Source to Target | Medium | BacktrackingDepth-First SearchBreadth-First Search |
| 6 | Apply Substitutions | Medium | ArrayHash TableString |
| 7 | Build a Matrix With Conditions | Hard | ArrayGraphTopological Sort |
| 8 | Cat and Mouse | Hard | MathDynamic ProgrammingGraph |
| 9 | Cat and Mouse II | Hard | ArrayMathDynamic Programming |
| 10 | Cheapest Flights Within K Stops | Medium | Dynamic ProgrammingDepth-First SearchBreadth-First Search |
| 11 | Check for Contradictions in Equations | Hard | ArrayDepth-First SearchUnion Find |
| 12 | Checking Existence of Edge Length Limited Paths | Hard | ArrayTwo PointersUnion Find |
| 13 | Checking Existence of Edge Length Limited Paths II | Hard | Union FindGraphMinimum Spanning Tree |
| 14 | Clone Graph | Medium | Hash TableDepth-First SearchBreadth-First Search |
| 15 | Collect Coins in a Tree | Hard | ArrayTreeGraph |
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