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"translatedContent": "<p>给你一个整数数组&nbsp;<code>nums</code>,返回 <code>nums</code>&nbsp;中最长等差子序列的<strong>长度</strong>。</p>\n\n<p>回想一下,<code>nums</code> 的子序列是一个列表&nbsp;<code>nums[i<sub>1</sub>], nums[i<sub>2</sub>], ..., nums[i<sub>k</sub>]</code> ,且&nbsp;<code>0 &lt;= i<sub>1</sub> &lt; i<sub>2</sub> &lt; ... &lt; i<sub>k</sub> &lt;= nums.length - 1</code>。并且如果&nbsp;<code>seq[i+1] - seq[i]</code>(&nbsp;<code>0 &lt;= i &lt; seq.length - 1</code>) 的值都相同,那么序列&nbsp;<code>seq</code>&nbsp;是等差的。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n\n<pre>\n<strong>输入:</strong>nums = [3,6,9,12]\n<strong>输出:</strong>4\n<strong>解释: </strong>\n整个数组是公差为 3 的等差数列。\n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<pre>\n<strong>输入:</strong>nums = [9,4,7,2,10]\n<strong>输出:</strong>3\n<strong>解释:</strong>\n最长的等差子序列是 [4,7,10]。\n</pre>\n\n<p><strong>示例 3</strong></p>\n\n<pre>\n<strong>输入:</strong>nums = [20,1,15,3,10,5,8]\n<strong>输出:</strong>4\n<strong>解释:</strong>\n最长的等差子序列是 [20,15,10,5]。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= nums.length &lt;= 1000</code></li>\n\t<li><code>0 &lt;= nums[i] &lt;= 500</code></li>\n</ul>\n",
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