mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
177 lines
22 KiB
JSON
177 lines
22 KiB
JSON
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"title": "Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold",
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"content": "<p>Given an array of integers <code>arr</code> and two integers <code>k</code> and <code>threshold</code>, return <em>the number of sub-arrays of size </em><code>k</code><em> and average greater than or equal to </em><code>threshold</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [2,2,2,2,5,5,5,8], k = 3, threshold = 4\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> Sub-arrays [2,5,5],[5,5,5] and [5,5,8] have averages 4, 5 and 6 respectively. All other sub-arrays of size 3 have averages less than 4 (the threshold).\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [11,13,17,23,29,31,7,5,2,3], k = 3, threshold = 5\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> The first 6 sub-arrays of size 3 have averages greater than 5. Note that averages are not integers.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= arr[i] <= 10<sup>4</sup></code></li>\n\t<li><code>1 <= k <= arr.length</code></li>\n\t<li><code>0 <= threshold <= 10<sup>4</sup></code></li>\n</ul>\n",
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"translatedTitle": "大小为 K 且平均值大于等于阈值的子数组数目",
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"translatedContent": "<p>给你一个整数数组 <code>arr</code> 和两个整数 <code>k</code> 和 <code>threshold</code> 。</p>\n\n<p>请你返回长度为 <code>k</code> 且平均值大于等于 <code>threshold</code> 的子数组数目。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [2,2,2,2,5,5,5,8], k = 3, threshold = 4\n<strong>输出：</strong>3\n<strong>解释：</strong>子数组 [2,5,5],[5,5,5] 和 [5,5,8] 的平均值分别为 4，5 和 6 。其他长度为 3 的子数组的平均值都小于 4 （threshold 的值)。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>arr = [11,13,17,23,29,31,7,5,2,3], k = 3, threshold = 5\n<strong>输出：</strong>6\n<strong>解释：</strong>前 6 个长度为 3 的子数组平均值都大于 5 。注意平均值不是整数。\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= arr[i] <= 10<sup>4</sup></code></li>\n\t<li><code>1 <= k <= arr.length</code></li>\n\t<li><code>0 <= threshold <= 10<sup>4</sup></code></li>\n</ul>\n",
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"Start with a window of size K and test its average against the threshold.",
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"Keep moving the window by one element maintaining its size k until you cover the whole array. count number of windows that satisfy that its average is greater than the threshold."
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