{ "data": { "question": { "questionId": "2954", "questionFrontendId": "2841", "categoryTitle": "Algorithms", "boundTopicId": 2420988, "title": "Maximum Sum of Almost Unique Subarray", "titleSlug": "maximum-sum-of-almost-unique-subarray", "content": "

You are given an integer array nums and two positive integers m and k.

\n\n

Return the maximum sum out of all almost unique subarrays of length k of nums. If no such subarray exists, return 0.

\n\n

A subarray of nums is almost unique if it contains at least m distinct elements.

\n\n

A subarray is a contiguous non-empty sequence of elements within an array.

\n\n

 

\n

Example 1:

\n\n
\nInput: nums = [2,6,7,3,1,7], m = 3, k = 4\nOutput: 18\nExplanation: There are 3 almost unique subarrays of size k = 4. These subarrays are [2, 6, 7, 3], [6, 7, 3, 1], and [7, 3, 1, 7]. Among these subarrays, the one with the maximum sum is [2, 6, 7, 3] which has a sum of 18.\n
\n\n

Example 2:

\n\n
\nInput: nums = [5,9,9,2,4,5,4], m = 1, k = 3\nOutput: 23\nExplanation: There are 5 almost unique subarrays of size k. These subarrays are [5, 9, 9], [9, 9, 2], [9, 2, 4], [2, 4, 5], and [4, 5, 4]. Among these subarrays, the one with the maximum sum is [5, 9, 9] which has a sum of 23.\n
\n\n

Example 3:

\n\n
\nInput: nums = [1,2,1,2,1,2,1], m = 3, k = 3\nOutput: 0\nExplanation: There are no subarrays of size k = 3 that contain at least m = 3 distinct elements in the given array [1,2,1,2,1,2,1]. Therefore, no almost unique subarrays exist, and the maximum sum is 0.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "几乎唯一子数组的最大和", "translatedContent": "

给你一个整数数组 nums 和两个正整数 m 和 k 。

\n\n

请你返回 nums 中长度为 k 的 几乎唯一 子数组的 最大和 ，如果不存在几乎唯一子数组，请你返回 0 。

\n\n

如果 nums 的一个子数组有至少 m 个互不相同的元素，我们称它是 几乎唯一 子数组。

\n\n

子数组指的是一个数组中一段连续 非空 的元素序列。

\n\n

 

\n\n

示例 1：

\n\n
\n输入：nums = [2,6,7,3,1,7], m = 3, k = 4\n输出：18\n解释：总共有 3 个长度为 k = 4 的几乎唯一子数组。分别为 [2, 6, 7, 3] ，[6, 7, 3, 1] 和 [7, 3, 1, 7] 。这些子数组中，和最大的是 [2, 6, 7, 3] ，和为 18 。\n
\n\n

示例 2：

\n\n
\n输入：nums = [5,9,9,2,4,5,4], m = 1, k = 3\n输出：23\n解释：总共有 5 个长度为 k = 3 的几乎唯一子数组。分别为 [5, 9, 9] ，[9, 9, 2] ，[9, 2, 4] ，[2, 4, 5] 和 [4, 5, 4] 。这些子数组中，和最大的是 [5, 9, 9] ，和为 23 。\n
\n\n

示例 3：

\n\n
\n输入：nums = [1,2,1,2,1,2,1], m = 3, k = 3\n输出：0\n解释：输入数组中不存在长度为 k = 3 的子数组含有至少  m = 3 个互不相同元素的子数组。所以不存在几乎唯一子数组，最大和为 0 。\n
\n\n

 

\n\n

提示：

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