<a target="_blank" href="https://leetcode.com/problems/number-of-boomerangs/">Problem Link</a>
<pre><code>class Solution:
 def numberOfBoomerangs(self, points: List[List[int]]) -&gt; int:
 res = 0
 for p1 in points:
 d = defaultdict(int)
 for p2 in points:
 curDist = (p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2
 if curDist in d:
 res += d[curDist] * 2
 d[curDist] += 1
 return res
</code></pre>

[Problem Link](https://leetcode.com/problems/number-of-boomerangs/)


```
class Solution:
    def numberOfBoomerangs(self, points: List[List[int]]) -> int:
        res = 0
        for p1 in points:
            d = defaultdict(int)
            for p2 in points:
                curDist = (p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2
                if curDist in d:
                    res += d[curDist] * 2
                d[curDist] += 1
        return res
``` 


447. Number of Boomerangs