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31 lines
1.2 KiB
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31 lines
1.2 KiB
HTML
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Given a <strong>0-indexed</strong> integer array <code>nums</code> of length <code>n</code> and an integer <code>k</code>, return <em>the <strong>number of pairs</strong></em> <code>(i, j)</code> <em>where</em> <code>0 <= i < j < n</code>, <em>such that</em> <code>nums[i] == nums[j]</code> <em>and</em> <code>(i * j)</code> <em>is divisible by</em> <code>k</code>.
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [3,1,2,2,2,1,3], k = 2
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<strong>Output:</strong> 4
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<strong>Explanation:</strong>
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There are 4 pairs that meet all the requirements:
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- nums[0] == nums[6], and 0 * 6 == 0, which is divisible by 2.
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- nums[2] == nums[3], and 2 * 3 == 6, which is divisible by 2.
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- nums[2] == nums[4], and 2 * 4 == 8, which is divisible by 2.
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- nums[3] == nums[4], and 3 * 4 == 12, which is divisible by 2.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [1,2,3,4], k = 1
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<strong>Output:</strong> 0
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<strong>Explanation:</strong> Since no value in nums is repeated, there are no pairs (i,j) that meet all the requirements.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= nums.length <= 100</code></li>
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<li><code>1 <= nums[i], k <= 100</code></li>
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</ul>
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