leetcode-problemset/leetcode-cn/originData/longest-alternating-subarray.json

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            "questionId": "2870",
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            "categoryTitle": "Algorithms",
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            "title": "Longest Alternating Subarray",
            "titleSlug": "longest-alternating-subarray",
            "content": "<p>You are given a <strong>0-indexed</strong> integer array <code>nums</code>. A subarray <code>s</code> of length <code>m</code> is called <strong>alternating</strong> if:</p>\n\n<ul>\n\t<li><code>m</code> is greater than <code>1</code>.</li>\n\t<li><code>s<sub>1</sub> = s<sub>0</sub> + 1</code>.</li>\n\t<li>The <strong>0-indexed</strong> subarray <code>s</code> looks like <code>[s<sub>0</sub>, s<sub>1</sub>, s<sub>0</sub>, s<sub>1</sub>,...,s<sub>(m-1) % 2</sub>]</code>. In other words, <code>s<sub>1</sub> - s<sub>0</sub> = 1</code>, <code>s<sub>2</sub> - s<sub>1</sub> = -1</code>, <code>s<sub>3</sub> - s<sub>2</sub> = 1</code>, <code>s<sub>4</sub> - s<sub>3</sub> = -1</code>, and so on up to <code>s[m - 1] - s[m - 2] = (-1)<sup>m</sup></code>.</li>\n</ul>\n\n<p>Return <em>the maximum length of all <strong>alternating</strong> subarrays present in </em><code>nums</code> <em>or </em><code>-1</code><em> if no such subarray exists</em><em>.</em></p>\n\n<p>A subarray is a contiguous <strong>non-empty</strong> sequence of elements within an array.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">nums = [2,3,4,3,4]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">4</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The alternating subarrays are <code>[2, 3]</code>, <code>[3,4]</code>, <code>[3,4,3]</code>, and <code>[3,4,3,4]</code>. The longest of these is <code>[3,4,3,4]</code>, which is of length 4.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">nums = [4,5,6]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p><code>[4,5]</code> and <code>[5,6]</code> are the only two alternating subarrays. They are both of length 2.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= nums.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 10<sup>4</sup></code></li>\n</ul>\n",
            "translatedTitle": "最长交替子数组",
            "translatedContent": "<p>给你一个下标从 <strong>0</strong>&nbsp;开始的整数数组&nbsp;<code>nums</code>&nbsp;。如果 <code>nums</code>&nbsp;中长度为&nbsp;<code>m</code>&nbsp;的子数组&nbsp;<code>s</code>&nbsp;满足以下条件，我们称它是一个 <strong>交替子数组</strong> ：</p>\n\n<ul>\n\t<li><code>m</code>&nbsp;大于&nbsp;<code>1</code>&nbsp;。</li>\n\t<li><code>s<sub>1</sub> = s<sub>0</sub> + 1</code>&nbsp;。</li>\n\t<li>下标从 <strong>0</strong> 开始的子数组&nbsp;<code>s</code>&nbsp;与数组&nbsp;<code>[s<sub>0</sub>, s<sub>1</sub>, s<sub>0</sub>, s<sub>1</sub>,...,s<sub>(m-1) % 2</sub>]</code>&nbsp;一样。也就是说，<code>s<sub>1</sub> - s<sub>0</sub> = 1</code>&nbsp;，<code>s<sub>2</sub> - s<sub>1</sub> = -1</code>&nbsp;，<code>s<sub>3</sub> - s<sub>2</sub> = 1</code>&nbsp;，<code>s<sub>4</sub> - s<sub>3</sub> = -1</code>&nbsp;，以此类推，直到&nbsp;<code>s[m - 1] - s[m - 2] = (-1)<sup>m</sup></code>&nbsp;。</li>\n</ul>\n\n<p>请你返回 <code>nums</code>&nbsp;中所有 <strong>交替</strong>&nbsp;子数组中，最长的长度，如果不存在交替子数组，请你返回 <code>-1</code>&nbsp;。</p>\n\n<p>子数组是一个数组中一段连续 <strong>非空</strong>&nbsp;的元素序列。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\"><b>输入：</b>nums = [2,3,4,3,4]</div>\n\n<div class=\"example-block\"><b>输出：</b>4</div>\n\n<div class=\"example-block\"><b>解释：</b>交替子数组有 <code>[2,3]</code>，<code>[3,4]</code>，<code>[3,4,3]</code> 和 <code>[3,4,3,4]</code>。最长的子数组为 <code>[3,4,3,4]</code>，长度为 4。</div>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\"><b>输入：</b>nums = [4,5,6]</div>\n\n<div class=\"example-block\"><b>输出：</b>2</div>\n\n<div class=\"example-block\"><strong>解释：</strong><code>[4,5]</code> 和 <code>[5,6]</code> 是仅有的两个交替子数组。它们长度都为 2 。</div>\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;= 100</code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 10<sup>4</sup></code></li>\n</ul>\n",
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