mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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181 lines
17 KiB
JSON
181 lines
17 KiB
JSON
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"questionId": "2574",
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"title": "Count Subarrays With Median K",
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"content": "<p>You are given an array <code>nums</code> of size <code>n</code> consisting of <strong>distinct </strong>integers from <code>1</code> to <code>n</code> and a positive integer <code>k</code>.</p>\n\n<p>Return <em>the number of non-empty subarrays in </em><code>nums</code><em> that have a <strong>median</strong> equal to </em><code>k</code>.</p>\n\n<p><strong>Note</strong>:</p>\n\n<ul>\n\t<li>The median of an array is the <strong>middle </strong>element after sorting the array in <strong>ascending </strong>order. If the array is of even length, the median is the <strong>left </strong>middle element.\n\n\t<ul>\n\t\t<li>For example, the median of <code>[2,3,1,4]</code> is <code>2</code>, and the median of <code>[8,4,3,5,1]</code> is <code>4</code>.</li>\n\t</ul>\n\t</li>\n\t<li>A subarray is a contiguous part of an array.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [3,2,1,4,5], k = 4\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The subarrays that have a median equal to 4 are: [4], [4,5] and [1,4,5].\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [2,3,1], k = 3\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> [3] is the only subarray that has a median equal to 3.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == nums.length</code></li>\n\t<li><code>1 <= n <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= nums[i], k <= n</code></li>\n\t<li>The integers in <code>nums</code> are distinct.</li>\n</ul>\n",
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"categoryTitle": "Algorithms",
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"name": "Prefix Sum",
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"code": "# @param {Integer[]} nums\n# @param {Integer} k\n# @return {Integer}\ndef count_subarrays(nums, k)\n \nend",
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"code": "impl Solution {\n pub fn count_subarrays(nums: Vec<i32>, k: i32) -> i32 {\n \n }\n}",
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"code": "-spec count_subarrays(Nums :: [integer()], K :: integer()) -> integer().\ncount_subarrays(Nums, K) ->\n .",
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"code": "defmodule Solution do\n @spec count_subarrays(nums :: [integer], k :: integer) :: integer\n def count_subarrays(nums, k) do\n \n end\nend",
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"hints": [
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"Consider changing the numbers that are strictly greater than k in the array to 1, the numbers that are strictly smaller than k to -1, and k to 0.",
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"After the change, what property does a subarray with median k have in the new array?",
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"An array with median k should have a sum equal to either 0 or 1 in the new array and should contain the element k. How do you count such subarrays?"
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "[3,2,1,4,5]\n4",
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