[submission:https://codeforces.me/contest/1774/submission/250501754]
i have checked everything but cant find the bug
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Supported by
set<int>&. I don't see you modifying the set indfs2, so it is safe to pass it as a reference. If not, the complexity is raised to $$$N^2$$$ due to there are $$$N$$$ dfs calls and the set is copied each time. (The logn part grows slower than the set copy part.)you're copying the set object -> O(n) -> O(n2 * log(n))