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# Graph Valid Tree N-1 Edges **Idea.** Union-Find with exactly n-1 edges and no cycle, or DFS connectivity. **Interview tip.** Restate constraints, give brute force first, then optimize. Trace one example out loud before coding. *Disclosure: practice note shared by the Linkjob AI team.* For live mock-interview practice see [undetectable AI interview copilot](https://www.linkjob.ai/).
Turkar's Bin
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