leetcode-problemset/leetcode-cn/originData/count-number-of-pairs-with-absolute-difference-k.json

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            "questionId": "2116",
            "questionFrontendId": "2006",
            "categoryTitle": "Algorithms",
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            "title": "Count Number of Pairs With Absolute Difference K",
            "titleSlug": "count-number-of-pairs-with-absolute-difference-k",
            "content": "<p>Given an integer array <code>nums</code> and an integer <code>k</code>, return <em>the number of pairs</em> <code>(i, j)</code> <em>where</em> <code>i &lt; j</code> <em>such that</em> <code>|nums[i] - nums[j]| == k</code>.</p>\n\n<p>The value of <code>|x|</code> is defined as:</p>\n\n<ul>\n\t<li><code>x</code> if <code>x &gt;= 0</code>.</li>\n\t<li><code>-x</code> if <code>x &lt; 0</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 = [1,2,2,1], k = 1\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> The pairs with an absolute difference of 1 are:\n- [<strong><u>1</u></strong>,<strong><u>2</u></strong>,2,1]\n- [<strong><u>1</u></strong>,2,<strong><u>2</u></strong>,1]\n- [1,<strong><u>2</u></strong>,2,<strong><u>1</u></strong>]\n- [1,2,<strong><u>2</u></strong>,<strong><u>1</u></strong>]\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,3], k = 3\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> There are no pairs with an absolute difference of 3.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [3,2,1,5,4], k = 2\n<strong>Output:</strong> 3\n<b>Explanation:</b> The pairs with an absolute difference of 2 are:\n- [<strong><u>3</u></strong>,2,<strong><u>1</u></strong>,5,4]\n- [<strong><u>3</u></strong>,2,1,<strong><u>5</u></strong>,4]\n- [3,<strong><u>2</u></strong>,1,5,<strong><u>4</u></strong>]\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;= 200</code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 100</code></li>\n\t<li><code>1 &lt;= k &lt;= 99</code></li>\n</ul>\n",
            "translatedTitle": "差的绝对值为 K 的数对数目",
            "translatedContent": "<p>给你一个整数数组&nbsp;<code>nums</code>&nbsp;和一个整数&nbsp;<code>k</code>&nbsp;，请你返回数对&nbsp;<code>(i, j)</code>&nbsp;的数目，满足&nbsp;<code>i &lt; j</code>&nbsp;且&nbsp;<code>|nums[i] - nums[j]| == k</code>&nbsp;。</p>\n\n<p><code>|x|</code>&nbsp;的值定义为：</p>\n\n<ul>\n\t<li>如果&nbsp;<code>x &gt;= 0</code>&nbsp;，那么值为&nbsp;<code>x</code>&nbsp;。</li>\n\t<li>如果&nbsp;<code>x &lt; 0</code>&nbsp;，那么值为&nbsp;<code>-x</code>&nbsp;。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><b>输入：</b>nums = [1,2,2,1], k = 1\n<b>输出：</b>4\n<b>解释：</b>差的绝对值为 1 的数对为：\n- [<em><strong>1</strong></em>,<em><strong>2</strong></em>,2,1]\n- [<em><strong>1</strong></em>,2,<em><strong>2</strong></em>,1]\n- [1,<em><strong>2</strong></em>,2,<em><strong>1</strong></em>]\n- [1,2,<em><strong>2</strong></em>,<em><strong>1</strong></em>]\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><b>输入：</b>nums = [1,3], k = 3\n<b>输出：</b>0\n<b>解释：</b>没有任何数对差的绝对值为 3 。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><b>输入：</b>nums = [3,2,1,5,4], k = 2\n<b>输出：</b>3\n<b>解释：</b>差的绝对值为 2 的数对为：\n- [<em><strong>3</strong></em>,2,<em><strong>1</strong></em>,5,4]\n- [<em><strong>3</strong></em>,2,1,<em><strong>5</strong></em>,4]\n- [3,<em><strong>2</strong></em>,1,5,<em><strong>4</strong></em>]\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;= 200</code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 100</code></li>\n\t<li><code>1 &lt;= k &lt;= 99</code></li>\n</ul>\n",
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