Leetcode Problem 2857. Count Pairs of Points With Distance k

2857. Count Pairs of Points With Distance k

Leetcode Solutions

One Pass + Hash Map

  1. Initialize a hash map seen to keep track of the frequency of points.
  2. Initialize result to 0, which will hold the number of valid pairs.
  3. Iterate through each point (x, y) in coordinates.
  4. For each point, iterate through all possible split values from 0 to k.
  5. Calculate the complementary x and y values (x_complement and y_complement) using XOR with split and k - split respectively.
  6. If the complementary point is in seen, add its frequency to result.
  7. Update the frequency of the current point (x, y) in seen.
  8. Return result.
UML Thumbnail

Simple Brute Force using suffix count

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