Difficulty: Easy
Tags: LeetCode, Easy, leetcode-3162, Math, O(rlogr + n + m), O(r), Number Theory, Freq Table, Brute Force, Array, Hash Table

Problem

You are given 2 integer arrays nums1 and nums2 of lengths n and m respectively. You are also given a positive integer k.

A pair (i, j) is called good if nums1[i] is divisible by nums2[j] * k (0 <= i <= n - 1, 0 <= j <= m - 1).

Return the total number of good pairs.

Example 1:

Input: nums1 = [1,3,4], nums2 = [1,3,4], k = 1

Output: 5

Explanation:

The 5 good pairs are (0, 0), (1, 0), (1, 1), (2, 0), and (2, 2).

Example 2:

Input: nums1 = [1,2,4,12], nums2 = [2,4], k = 3

Output: 2

Explanation:

The 2 good pairs are (3, 0) and (3, 1).

Constraints: