Leetcode Problem 2176. Count Equal and Divisible Pairs in an Array

2176. Count Equal and Divisible Pairs in an Array

Leetcode Solutions

Brute Force Approach

  1. Initialize a variable count to 0 to store the number of valid pairs.
  2. Iterate over the array with two nested loops, with the outer loop index i ranging from 0 to n-2 and the inner loop index j ranging from i+1 to n-1.
  3. For each pair (i, j), check if nums[i] == nums[j].
  4. If the elements are equal, check if (i * j) % k == 0.
  5. If both conditions are satisfied, increment count by 1.
  6. After the loops finish, return the value of count.
UML Thumbnail

Frequency Map with Divisibility Optimization

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