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leetcode-problemset/leetcode/originData/maximum-sum-of-distinct-subarrays-with-length-k.json

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{
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"title": "Maximum Sum of Distinct Subarrays With Length K",
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"content": "<p>You are given an integer array <code>nums</code> and an integer <code>k</code>. Find the maximum subarray sum of all the subarrays of <code>nums</code> that meet the following conditions:</p>\n\n<ul>\n\t<li>The length of the subarray is <code>k</code>, and</li>\n\t<li>All the elements of the subarray are <strong>distinct</strong>.</li>\n</ul>\n\n<p>Return <em>the maximum subarray sum of all the subarrays that meet the conditions</em><em>.</em> If no subarray meets the conditions, return <code>0</code>.</p>\n\n<p><em>A <strong>subarray</strong> is a contiguous non-empty sequence of elements within an array.</em></p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,5,4,2,9,9,9], k = 3\n<strong>Output:</strong> 15\n<strong>Explanation:</strong> The subarrays of nums with length 3 are:\n- [1,5,4] which meets the requirements and has a sum of 10.\n- [5,4,2] which meets the requirements and has a sum of 11.\n- [4,2,9] which meets the requirements and has a sum of 15.\n- [2,9,9] which does not meet the requirements because the element 9 is repeated.\n- [9,9,9] which does not meet the requirements because the element 9 is repeated.\nWe return 15 because it is the maximum subarray sum of all the subarrays that meet the conditions\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [4,4,4], k = 3\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> The subarrays of nums with length 3 are:\n- [4,4,4] which does not meet the requirements because the element 4 is repeated.\nWe return 0 because no subarrays meet the conditions.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= k &lt;= nums.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 10<sup>5</sup></code></li>\n</ul>\n",
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"code": "defmodule Solution do\n @spec maximum_subarray_sum(nums :: [integer], k :: integer) :: integer\n def maximum_subarray_sum(nums, k) do\n \n end\nend",
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"hints": [
"Which elements change when moving from the subarray of size k that ends at index i to the subarray of size k that ends at index i + 1?",
"Only two elements change, the element at i + 1 is added into the subarray, and the element at i - k + 1 gets removed from the subarray.",
"Iterate through each subarray of size k and keep track of the sum of the subarray and the frequency of each element."
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