2176.js

/** ------------------------------------------------------------------------------
 * 
 * 2176. Count Equal and Divisible Pairs in an Array
 * Topics: Array, Hash Table, Math, Counting
 * https://leetcode.com/problems/count-equal-and-divisible-pairs-in-an-array/description/?envType=daily-question&envId=2025-04-17
 * 
 ------------------------------------------------------------------------------ */
/**
 * @param {number[]} nums
 * @param {number} k
 * @return {number}
 */
var countPairs = function (nums, k) {
  let count = 0

  for (let i = 0; i < nums.length; i++) {
    for (let j = i + 1; j < nums.length; j++) {
      //Used const for intermediate boolean expressions (isSame, isDivisible)
      const isSame = nums[i] === nums[j]
      const isDivisible = (i * j) % k === 0

      if (isSame && isDivisible) {
        count++
      }
    }
  }
  return count
}

console.log(countPairs([3, 1, 2, 2, 2, 1, 3], 2))