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class Solution { public: int findCenter(vector<vector<int>>& edges) { int n = edges.size() + 1; vector<int> indegree(n + 2, 0); for (auto &it: edges) { indegree[it[0]]++; indegree[it[1]]++; } for (int i = 1; i <= n; i++) { if (indegree[i] == n - 1) return i; } return 0; } };
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