1791. Find Center of Star Graph

class Solution {
public:
    int findCenter(vector<vector<int>>& edges)
    {
        vector<int> first = edges[0], second = edges[1];
        return (first[0] == second[0] || first[0] == second[1]) ? first[0] : first[1];
    }
};

• T: $O(1)$
• S: $O(1)$