leetcode-problemset/leetcode-cn/originData/count-good-triplets.json

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        "question": {
            "questionId": "1656",
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            "title": "Count Good Triplets",
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            "content": "<p>Given an array of integers <code>arr</code>, and three integers&nbsp;<code>a</code>,&nbsp;<code>b</code>&nbsp;and&nbsp;<code>c</code>. You need to find the number of good triplets.</p>\r\n\r\n<p>A triplet <code>(arr[i], arr[j], arr[k])</code>&nbsp;is <strong>good</strong> if the following conditions are true:</p>\r\n\r\n<ul>\r\n\t<li><code>0 &lt;= i &lt; j &lt; k &lt;&nbsp;arr.length</code></li>\r\n\t<li><code>|arr[i] - arr[j]| &lt;= a</code></li>\r\n\t<li><code>|arr[j] - arr[k]| &lt;= b</code></li>\r\n\t<li><code>|arr[i] - arr[k]| &lt;= c</code></li>\r\n</ul>\r\n\r\n<p>Where <code>|x|</code> denotes the absolute value of <code>x</code>.</p>\r\n\r\n<p>Return<em> the number of good triplets</em>.</p>\r\n\r\n<p>&nbsp;</p>\r\n<p><strong>Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> arr = [3,0,1,1,9,7], a = 7, b = 2, c = 3\r\n<strong>Output:</strong> 4\r\n<strong>Explanation:</strong>&nbsp;There are 4 good triplets: [(3,0,1), (3,0,1), (3,1,1), (0,1,1)].\r\n</pre>\r\n\r\n<p><strong>Example 2:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> arr = [1,1,2,2,3], a = 0, b = 0, c = 1\r\n<strong>Output:</strong> 0\r\n<strong>Explanation: </strong>No triplet satisfies all conditions.\r\n</pre>\r\n\r\n<p>&nbsp;</p>\r\n<p><strong>Constraints:</strong></p>\r\n\r\n<ul>\r\n\t<li><code>3 &lt;= arr.length &lt;= 100</code></li>\r\n\t<li><code>0 &lt;= arr[i] &lt;= 1000</code></li>\r\n\t<li><code>0 &lt;= a, b, c &lt;= 1000</code></li>\r\n</ul>",
            "translatedTitle": "统计好三元组",
            "translatedContent": "<p>给你一个整数数组 <code>arr</code> ，以及 <code>a</code>、<code>b</code> 、<code>c</code> 三个整数。请你统计其中好三元组的数量。</p>\n\n<p>如果三元组 <code>(arr[i], arr[j], arr[k])</code> 满足下列全部条件，则认为它是一个 <strong>好三元组</strong> 。</p>\n\n<ul>\n\t<li><code>0 &lt;= i &lt; j &lt; k &lt;&nbsp;arr.length</code></li>\n\t<li><code>|arr[i] - arr[j]| &lt;= a</code></li>\n\t<li><code>|arr[j] - arr[k]| &lt;= b</code></li>\n\t<li><code>|arr[i] - arr[k]| &lt;= c</code></li>\n</ul>\n\n<p>其中 <code>|x|</code> 表示 <code>x</code> 的绝对值。</p>\n\n<p>返回 <strong>好三元组的数量</strong> 。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入：</strong>arr = [3,0,1,1,9,7], a = 7, b = 2, c = 3\n<strong>输出：</strong>4\n<strong>解释：</strong>一共有 4 个好三元组：[(3,0,1), (3,0,1), (3,1,1), (0,1,1)] 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入：</strong>arr = [1,1,2,2,3], a = 0, b = 0, c = 1\n<strong>输出：</strong>0\n<strong>解释：</strong>不存在满足所有条件的三元组。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>3 &lt;= arr.length &lt;= 100</code></li>\n\t<li><code>0 &lt;= arr[i] &lt;= 1000</code></li>\n\t<li><code>0 &lt;= a, b, c &lt;= 1000</code></li>\n</ul>\n",
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                "Notice that the constraints are small enough for a brute force solution to pass.",
                "Loop through all triplets, and count the ones that are good."
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