mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-11 02:58:13 +08:00
40 lines
1.4 KiB
HTML
40 lines
1.4 KiB
HTML
<p>You may recall that an array <code>arr</code> is a <strong>mountain array</strong> if and only if:</p>
|
||
|
||
<ul>
|
||
<li><code>arr.length >= 3</code></li>
|
||
<li>There exists some index <code>i</code> (<strong>0-indexed</strong>) with <code>0 < i < arr.length - 1</code> such that:
|
||
<ul>
|
||
<li><code>arr[0] < arr[1] < ... < arr[i - 1] < arr[i]</code></li>
|
||
<li><code>arr[i] > arr[i + 1] > ... > arr[arr.length - 1]</code></li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
|
||
<p>Given an integer array <code>nums</code>, return <em>the <strong>minimum</strong> number of elements to remove to make </em><code>nums<em></em></code><em> </em><em>a <strong>mountain array</strong>.</em></p>
|
||
|
||
<p> </p>
|
||
<p><strong>Example 1:</strong></p>
|
||
|
||
<pre>
|
||
<strong>Input:</strong> nums = [1,3,1]
|
||
<strong>Output:</strong> 0
|
||
<strong>Explanation:</strong> The array itself is a mountain array so we do not need to remove any elements.
|
||
</pre>
|
||
|
||
<p><strong>Example 2:</strong></p>
|
||
|
||
<pre>
|
||
<strong>Input:</strong> nums = [2,1,1,5,6,2,3,1]
|
||
<strong>Output:</strong> 3
|
||
<strong>Explanation:</strong> One solution is to remove the elements at indices 0, 1, and 5, making the array nums = [1,5,6,3,1].
|
||
</pre>
|
||
|
||
<p> </p>
|
||
<p><strong>Constraints:</strong></p>
|
||
|
||
<ul>
|
||
<li><code>3 <= nums.length <= 1000</code></li>
|
||
<li><code>1 <= nums[i] <= 10<sup>9</sup></code></li>
|
||
<li>It is guaranteed that you can make a mountain array out of <code>nums</code>.</li>
|
||
</ul>
|