Leetcode Problem 2183. Count Array Pairs Divisible by K

2183. Count Array Pairs Divisible by K

Leetcode Solutions

Counting Pairs with GCD and Divisibility

  1. Initialize a counter result to store the number of valid pairs.
  2. Create a dictionary gcdMap to store the count of numbers by their GCD with k.
  3. Iterate over each number in nums: a. Calculate the GCD of the current number and k. b. For each previously encountered GCD in gcdMap, check if the product of the current GCD and the previous GCD is divisible by k. c. If divisible, increment result by the count of the previous GCD in gcdMap. d. Update gcdMap with the current GCD count.
  4. Return the result.
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Brute Force Pair Checking

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