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# 2176. Count Equal and Divisible Pairs in an Array

## Description

Given a**0-indexed**integer array

`nums`

of length `n`

and an integer `k`

, return *the*

**number of pairs**`(i, j)`

*where*

`0 <= i < j < n`

, *such that*

`nums[i] == nums[j]`

*and*

`(i * j)`

*is divisible by*

`k`

.

**Example 1:**

Input:nums = [3,1,2,2,2,1,3], k = 2Output:4Explanation:There are 4 pairs that meet all the requirements: - nums[0] == nums[6], and 0 * 6 == 0, which is divisible by 2. - nums[2] == nums[3], and 2 * 3 == 6, which is divisible by 2. - nums[2] == nums[4], and 2 * 4 == 8, which is divisible by 2. - nums[3] == nums[4], and 3 * 4 == 12, which is divisible by 2.

**Example 2:**

Input:nums = [1,2,3,4], k = 1Output:0Explanation:Since no value in nums is repeated, there are no pairs (i,j) that meet all the requirements.

**Constraints:**

`1 <= nums.length <= 100`

`1 <= nums[i], k <= 100`