Leetcode Problem 447. Number of Boomerangs

447. Number of Boomerangs

Leetcode Solutions

Using HashMap to Store Distances and Count Boomerangs

  1. Initialize a variable count to store the total number of boomerangs.
  2. Iterate over each point p in the list of points.
  3. Create a HashMap d to store distances from point p to all other points.
  4. For each other point q, calculate the squared distance and increment its frequency in d.
  5. Iterate over the values in d and for each frequency f, add f * (f - 1) to count.
  6. Clear the HashMap d before moving to the next point p.
  7. Return the total count of boomerangs.
UML Thumbnail

Brute Force Approach with Distance Comparisons

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