447. Number of Boomerangs LeetCode Solution | Easy Approach

Minimum Cost to Merge Stones

Number of Boomerangs You are given n points in the plane that are all distinct, where points[i] = [xi, yi]. A boomerang is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple matters).

Return the number of boomerangs.

Example 1:

Input: points = [[0,0],[1,0],[2,0]]
Output: 2
Explanation: The two boomerangs are [[1,0],[0,0],[2,0]] and [[1,0],[2,0],[0,0]].

Example 2:

Input: points = [[1,1],[2,2],[3,3]]
Output: 2

Example 3:

Input: points = [[1,1]]
Output: 0


  • n == points.length
  • 1 <= n <= 500
  • points[i].length == 2
  • -104 <= xi, yi <= 104
  • All the points are unique.

Number of Boomerangs Solutions

Time: O(n)
Space: O(n)


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