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"question": {
"questionId": "1000013",
"questionFrontendId": "面试题 10.11",
"categoryTitle": "LCCI",
"boundTopicId": 91772,
"title": "Peaks and Valleys LCCI",
"titleSlug": "peaks-and-valleys-lcci",
"content": "<p>In an array of integers, a &quot;peak&quot; is an element which is greater than or equal to the adjacent integers and a &quot;valley&quot; is an element which is less than or equal to the adjacent inte&shy;gers. For example, in the array {5, 8, 4, 2, 3, 4, 6}, {8, 6} are peaks and {5, 2} are valleys. Given an array of integers, sort the array into an alternating sequence of peaks and valleys.</p>\r\n\r\n<p><strong>Example:</strong></p>\r\n\r\n<pre>\r\n<strong>Input: </strong>[5, 3, 1, 2, 3]\r\n<strong>Output:</strong>&nbsp;[5, 1, 3, 2, 3]\r\n</pre>\r\n\r\n<p><strong>Note: </strong></p>\r\n\r\n<ul>\r\n\t<li><code>nums.length &lt;= 10000</code></li>\r\n</ul>\r\n",
"translatedTitle": "峰与谷",
"translatedContent": "<p>在一个整数数组中,&ldquo;峰&rdquo;是大于或等于相邻整数的元素,相应地,&ldquo;谷&rdquo;是小于或等于相邻整数的元素。例如,在数组{5, 8, 4, 2, 3, 4, 6}中,{8, 6}是峰, {5, 2}是谷。现在给定一个整数数组,将该数组按峰与谷的交替顺序排序。</p>\n\n<p><strong>示例:</strong></p>\n\n<pre><strong>输入: </strong>[5, 3, 1, 2, 3]\n<strong>输出:</strong>&nbsp;[5, 1, 3, 2, 3]\n</pre>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>nums.length &lt;= 10000</code></li>\n</ul>\n",
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"hints": [
"假设数组按升序排序。有什么办法可以把它调整为交替的高峰和低谷?",
"尝试遍历排序的数组。你可以交换元素直到将数组调整好吗?",
"请注意如果确保山峰位置正确那么山谷也会在正确位置。因此对数组x的迭代可以跳过每一个其他元素。",
"你是否一定要对数组进行排序?你可以用一个未排序的数组来做到这一点吗?",
"假设你有{0, 1, 2}三个元素的序列以任意顺序排列。写出这些元素所有可能的排列以及如何把它们变成1是波峰的形式。",
"重新访问你刚才写出的{0, 1, 2}序列。想象一下有元素在最左边的元素之前。你能确保交换元素的方式不会使数组的前一部分失效吗?",
"你应该可以设计一个O(n) 的算法。"
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