Leet Code Daily 2024-06-27 - Find Center of Star Graph

class Solution {
public:
    int findCenter(vector<vector<int>>& edges) {
        unordered_set<int> nodes_with_edge;
        for (const auto& edge : edges) {
            for (const auto& node : edge) {
                if (nodes_with_edge.contains(node)) {
                    return node;
                }
                nodes_with_edge.insert(node);
            }
        }
        return -1;
    }
};