leetcode-problemset/leetcode-cn/originData/longest-arithmetic-subsequence.json

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            "title": "Longest Arithmetic Subsequence",
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            "content": "<p>Given an array <code>nums</code> of integers, return the <strong>length</strong> of the longest arithmetic subsequence in <code>nums</code>.</p>\n\n<p>Recall that a <em>subsequence</em> of an array <code>nums</code> is a list <code>nums[i<sub>1</sub>], nums[i<sub>2</sub>], ..., nums[i<sub>k</sub>]</code> with <code>0 &lt;= i<sub>1</sub> &lt; i<sub>2</sub> &lt; ... &lt; i<sub>k</sub> &lt;= nums.length - 1</code>, and that a sequence <code>seq</code> is <em>arithmetic</em> if <code>seq[i+1] - seq[i]</code> are all the same value (for <code>0 &lt;= i &lt; seq.length - 1</code>).</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [3,6,9,12]\n<strong>Output:</strong> 4\n<strong>Explanation: </strong>\nThe whole array is an arithmetic sequence with steps of length = 3.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [9,4,7,2,10]\n<strong>Output:</strong> 3\n<strong>Explanation: </strong>\nThe longest arithmetic subsequence is [4,7,10].\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [20,1,15,3,10,5,8]\n<strong>Output:</strong> 4\n<strong>Explanation: </strong>\nThe longest arithmetic subsequence is [20,15,10,5].\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</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",
            "translatedTitle": "最长等差数列",
            "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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