mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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174 lines
15 KiB
JSON
174 lines
15 KiB
JSON
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"content": "<p>You are given an <strong>even</strong> integer <code>n</code>. You initially have a permutation <code>perm</code> of size <code>n</code> where <code>perm[i] == i</code> <strong>(0-indexed)</strong>.</p>\n\n<p>In one operation, you will create a new array <code>arr</code>, and for each <code>i</code>:</p>\n\n<ul>\n\t<li>If <code>i % 2 == 0</code>, then <code>arr[i] = perm[i / 2]</code>.</li>\n\t<li>If <code>i % 2 == 1</code>, then <code>arr[i] = perm[n / 2 + (i - 1) / 2]</code>.</li>\n</ul>\n\n<p>You will then assign <code>arr</code> to <code>perm</code>.</p>\n\n<p>Return <em>the minimum <strong>non-zero</strong> number of operations you need to perform on </em><code>perm</code><em> to return the permutation to its initial value.</em></p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 2\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> perm = [0,1] initially.\nAfter the 1<sup>st</sup> operation, perm = [0,1]\nSo it takes only 1 operation.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 4\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> perm = [0,1,2,3] initially.\nAfter the 1<sup>st</sup> operation, perm = [0,2,1,3]\nAfter the 2<sup>nd</sup> operation, perm = [0,1,2,3]\nSo it takes only 2 operations.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 6\n<strong>Output:</strong> 4\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 <= n <= 1000</code></li>\n\t<li><code>n</code> is even.</li>\n</ul>\n",
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