HTMLify

class Solution:
    def findCenter(self, edges: List[List[int]]) -> int:
        flat = set()
        for l in edges[:3]:
            flat.add(l[0])
            flat.add(l[1])
        for e in flat:
            center = True
            for l in edges[:3]:
                if e not in l:
                    center = False
                    break
            if center:
                return e