Search
⌘K

Leetcode 1557. Minimum Number of Vertices to Reach All Nodes

Given a directed acyclic graph, find the smallest set of starting vertices from which every node is reachable. In a DAG this is uniquely achieved by selecting all nodes with zero in-degree (sources).

Question Timeline

See when this question was last asked and where, including any notes left by other candidates.

Comments

Your account is free and you can post anonymously if you choose.

Hello Interview Premium

Recent interview questions
System Design Guided Practice
Exclusive content
Learn More
Questions
Meta SWE Interview QuestionsAmazon SWE Interview QuestionsGoogle SWE Interview QuestionsOpenAI SWE Interview QuestionsEngineering Manager (EM) Interview Questions
Learn
Learn System DesignLearn DSALearn BehavioralLearn ML System DesignLearn Low Level DesignGuided Practice
Links
FAQPricingGift Mock InterviewsGift PremiumBecome a CoachOur CoachesHello Interview Premium
Legal
Terms and ConditionsPrivacy Policy
Contact
About UsProduct Support

7511 Greenwood Ave North Unit #4238 Seattle WA 98103

© 2026 Optick Labs Inc. All rights reserved.