Q91FMA.json

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            "questionFrontendId": "LCR 093",
            "categoryTitle": "Algorithms",
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            "title": "最长的斐波那契子序列的长度",
            "titleSlug": "Q91FMA",
            "content": "<p>English description is not available for the problem. Please switch to Chinese.</p>\n",
            "translatedTitle": "最长的斐波那契子序列的长度",
            "translatedContent": "<p>如果序列&nbsp;<code>X_1, X_2, ..., X_n</code>&nbsp;满足下列条件，就说它是&nbsp;<em>斐波那契式&nbsp;</em>的：</p>\n\n<ul>\n\t<li><code>n &gt;= 3</code></li>\n\t<li>对于所有&nbsp;<code>i + 2 &lt;= n</code>，都有&nbsp;<code>X_i + X_{i+1} = X_{i+2}</code></li>\n</ul>\n\n<p>给定一个<strong>严格递增</strong>的正整数数组形成序列 <code>arr</code>&nbsp;，找到 <code>arr</code> 中最长的斐波那契式的子序列的长度。如果一个不存在，返回&nbsp;&nbsp;0 。</p>\n\n<p><em>（回想一下，子序列是从原序列&nbsp; <code>arr</code> 中派生出来的，它从 <code>arr</code> 中删掉任意数量的元素（也可以不删），而不改变其余元素的顺序。例如，&nbsp;<code>[3, 5, 8]</code>&nbsp;是&nbsp;<code>[3, 4, 5, 6, 7, 8]</code>&nbsp;的一个子序列）</em></p>\n\n<p>&nbsp;</p>\n\n<ul>\n</ul>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入: </strong>arr =<strong> </strong>[1,2,3,4,5,6,7,8]\n<strong>输出: </strong>5\n<strong>解释: </strong>最长的斐波那契式子序列为 [1,2,3,5,8] 。\n</pre>\n\n<p><strong>示例&nbsp;2：</strong></p>\n\n<pre>\n<strong>输入: </strong>arr =<strong> </strong>[1,3,7,11,12,14,18]\n<strong>输出: </strong>3\n<strong>解释</strong>: 最长的斐波那契式子序列有 [1,11,12]、[3,11,14] 以及 [7,11,18] 。\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;= 1000</code></li>\n\t<li>\n\t<p><code>1 &lt;= arr[i] &lt; arr[i + 1] &lt;= 10^9</code></p>\n\t</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><meta charset=\"UTF-8\" />注意：本题与主站 873&nbsp;题相同：&nbsp;<a href=\"https://leetcode-cn.com/problems/length-of-longest-fibonacci-subsequence/\">https://leetcode-cn.com/problems/length-of-longest-fibonacci-subsequence/</a></p>\n",
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