题目：
题解：
class Solution:def numberOfBoomerangs(self, points: List[List[int]]) -> int:ans = 0for p in points:cnt = defaultdict(int)for q in points:dis = (p[0] - q[0]) * (p[0] - q[0]) + (p[1] - q[1]) * (p[1] - q[1])cnt[dis] += 1for m in cnt.values():ans += m * (m - 1)return ans
