leetcode-problemset/leetcode-cn/originData/count-the-number-of-fair-pairs.json

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            "title": "Count the Number of Fair Pairs",
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            "content": "<p>Given a <strong>0-indexed</strong> integer array <code>nums</code> of size <code>n</code> and two integers <code>lower</code> and <code>upper</code>, return <em>the number of fair pairs</em>.</p>\n\n<p>A pair <code>(i, j)</code> is <b>fair </b>if:</p>\n\n<ul>\n\t<li><code>0 &lt;= i &lt; j &lt; n</code>, and</li>\n\t<li><code>lower &lt;= nums[i] + nums[j] &lt;= upper</code></li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [0,1,7,4,4,5], lower = 3, upper = 6\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> There are 6 fair pairs: (0,3), (0,4), (0,5), (1,3), (1,4), and (1,5).\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,7,9,2,5], lower = 11, upper = 11\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> There is a single fair pair: (2,3).\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>nums.length == n</code></li>\n\t<li><code><font face=\"monospace\">-10<sup>9</sup></font>&nbsp;&lt;= nums[i] &lt;= 10<sup>9</sup></code></li>\n\t<li><code><font face=\"monospace\">-10<sup>9</sup>&nbsp;&lt;= lower &lt;= upper &lt;= 10<sup>9</sup></font></code></li>\n</ul>\n",
            "translatedTitle": "统计公平数对的数目",
            "translatedContent": "<p>给你一个下标从 <strong>0</strong> 开始、长度为 <code>n</code> 的整数数组&nbsp;<code>nums</code>&nbsp;，和两个整数&nbsp;<code>lower</code> 和&nbsp;<code>upper</code> ，返回 <strong>公平数对的数目</strong> 。</p>\n\n<p>如果&nbsp;<code>(i, j)</code>&nbsp;数对满足以下情况，则认为它是一个 <strong>公平数对</strong>&nbsp;：</p>\n\n<ul>\n\t<li><code>0 &lt;= i &lt; j &lt; n</code>，且</li>\n\t<li><code>lower &lt;= nums[i] + nums[j] &lt;= upper</code></li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><b>示例 1：</b></p>\n\n<pre>\n<b>输入：</b>nums = [0,1,7,4,4,5], lower = 3, upper = 6\n<b>输出：</b>6\n<b>解释：</b>共计 6 个公平数对：(0,3)、(0,4)、(0,5)、(1,3)、(1,4) 和 (1,5) 。\n</pre>\n\n<p><b>示例 2：</b></p>\n\n<pre>\n<b>输入：</b>nums = [1,7,9,2,5], lower = 11, upper = 11\n<b>输出：</b>1\n<b>解释：</b>只有单个公平数对：(2,3) 。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>nums.length == n</code></li>\n\t<li><code>-10<sup>9</sup>&nbsp;&lt;= nums[i] &lt;= 10<sup>9</sup></code></li>\n\t<li><code>-10<sup>9</sup>&nbsp;&lt;= lower &lt;= upper &lt;= 10<sup>9</sup></code></li>\n</ul>\n",
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