{ "data": { "question": { "questionId": "2277", "questionFrontendId": "2176", "boundTopicId": null, "title": "Count Equal and Divisible Pairs in an Array", "titleSlug": "count-equal-and-divisible-pairs-in-an-array", "content": "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.\n

 

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Example 1:

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\nInput: nums = [3,1,2,2,2,1,3], k = 2\nOutput: 4\nExplanation:\nThere are 4 pairs that meet all the requirements:\n- nums[0] == nums[6], and 0 * 6 == 0, which is divisible by 2.\n- nums[2] == nums[3], and 2 * 3 == 6, which is divisible by 2.\n- nums[2] == nums[4], and 2 * 4 == 8, which is divisible by 2.\n- nums[3] == nums[4], and 3 * 4 == 12, which is divisible by 2.\n
\n\n

Example 2:

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\nInput: nums = [1,2,3,4], k = 1\nOutput: 0\nExplanation: Since no value in nums is repeated, there are no pairs (i,j) that meet all the requirements.\n
\n\n

 

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Constraints:

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