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Leetcode 2368. Reachable Nodes With Restrictions

Given an undirected tree and a set of restricted (blocked) nodes, count how many nodes are reachable from node 0 without visiting any restricted node by traversing the tree while skipping blocked nodes. Constraints: tree of up to 1e5 nodes, edges form a valid tree so a single DFS/BFS traversal suffices.

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Leetcode 2368. Reachable Nodes With Restrictions | Hello Interview