leetcode-problemset/leetcode-cn/originData/check-if-array-is-good.json

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            "title": "Check if Array is Good",
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            "content": "<p>You are given an integer array <code>nums</code>. We consider an array <strong>good </strong>if it is a permutation of an array <code>base[n]</code>.</p>\n\n<p><code>base[n] = [1, 2, ..., n - 1, n, n] </code>(in other words, it is an array of length <code>n + 1</code> which contains <code>1</code> to <code>n - 1 </code>exactly once, plus two occurrences of <code>n</code>). For example, <code>base[1] = [1, 1]</code> and<code> base[3] = [1, 2, 3, 3]</code>.</p>\n\n<p>Return <code>true</code> <em>if the given array is good, otherwise return</em><em> </em><code>false</code>.</p>\n\n<p><strong>Note: </strong>A permutation of integers represents an arrangement of these numbers.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [2, 1, 3]\n<strong>Output:</strong> false\n<strong>Explanation:</strong> Since the maximum element of the array is 3, the only candidate n for which this array could be a permutation of base[n], is n = 3. However, base[3] has four elements but array nums has three. Therefore, it can not be a permutation of base[3] = [1, 2, 3, 3]. So the answer is false.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1, 3, 3, 2]\n<strong>Output:</strong> true\n<strong>Explanation:</strong> Since the maximum element of the array is 3, the only candidate n for which this array could be a permutation of base[n], is n = 3. It can be seen that nums is a permutation of base[3] = [1, 2, 3, 3] (by swapping the second and fourth elements in nums, we reach base[3]). Therefore, the answer is true.</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1, 1]\n<strong>Output:</strong> true\n<strong>Explanation:</strong> Since the maximum element of the array is 1, the only candidate n for which this array could be a permutation of base[n], is n = 1. It can be seen that nums is a permutation of base[1] = [1, 1]. Therefore, the answer is true.</pre>\n\n<p><strong class=\"example\">Example 4:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [3, 4, 4, 1, 2, 1]\n<strong>Output:</strong> false\n<strong>Explanation:</strong> Since the maximum element of the array is 4, the only candidate n for which this array could be a permutation of base[n], is n = 4. However, base[4] has five elements but array nums has six. Therefore, it can not be a permutation of base[4] = [1, 2, 3, 4, 4]. So the answer is false.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= num[i] &lt;= 200</code></li>\n</ul>\n",
            "translatedTitle": "检查数组是否是好的",
            "translatedContent": "<p>给你一个整数数组&nbsp;<code>nums</code>&nbsp;，如果它是数组&nbsp;<code>base[n]</code>&nbsp;的一个排列，我们称它是个&nbsp;<strong>好</strong>&nbsp;数组。</p>\n\n<p><code>base[n] = [1, 2, ..., n - 1, n, n]</code>&nbsp;（换句话说，它是一个长度为 <code>n + 1</code>&nbsp;且包含&nbsp;<code>1</code>&nbsp;到&nbsp;<code>n - 1</code>&nbsp;恰好各一次，包含 <code>n</code>&nbsp; 两次的一个数组）。比方说，<code>base[1] = [1, 1]</code>&nbsp;，<code>base[3] = [1, 2, 3, 3]</code>&nbsp;。</p>\n\n<p>如果数组是一个好数组，请你返回&nbsp;<code>true</code>&nbsp;，否则返回&nbsp;<code>false</code>&nbsp;。</p>\n\n<p><strong>注意：</strong>数组的排列是这些数字按任意顺序排布后重新得到的数组。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><b>输入：</b>nums = [2, 1, 3]\n<b>输出：</b>false\n<b>解释：</b>因为数组的最大元素是 3 ，唯一可以构成这个数组的 base[n] 对应的 n = 3 。但是 base[3] 有 4 个元素，但数组 nums 只有 3 个元素，所以无法得到 base[3] = [1, 2, 3, 3] 的排列，所以答案为 false 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><b>输入：</b>nums = [1, 3, 3, 2]\n<b>输出：</b>true\n<b>解释：因为</b>数组的最大元素是 3 ，唯一可以构成这个数组的 base[n] 对应的 n = 3 ，可以看出数组是 base[3] = [1, 2, 3, 3] 的一个排列（交换 nums 中第二个和第四个元素）。所以答案为 true 。</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><b>输入：</b>nums = [1, 1]\n<b>输出：</b>true\n<b>解释：</b>因为数组的最大元素是 1 ，唯一可以构成这个数组的 base[n] 对应的 n = 1，可以看出数组是 base[1] = [1, 1] 的一个排列。所以答案为 true 。</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<pre><b>输入：</b>nums = [3, 4, 4, 1, 2, 1]\n<b>输出：</b>false\n<b>解释：</b>因为数组的最大元素是 4 ，唯一可以构成这个数组的 base[n] 对应的 n = 4 。但是 base[n] 有 5 个元素而 nums 有 6 个元素。所以答案为 false 。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= num[i] &lt;= 200</code></li>\n</ul>\n",
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