菜鸟的每日力扣系列——1791. 找出星型图的中心节点

from collections import Counter
from typing import List


def findCenter(edges: List[List[int]]) -> int:
    n = len(edges)
    nums = [item for sublist in edges for item in sublist]
    counter = Counter(nums)
    for k, v in counter.items():
        if v == n:
            return k


edges = [[1, 2], [2, 3], [4, 2]]
print(findCenter(edges))  # 2