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add leetcode problem-cn part1

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<p>给你一个整数数组&nbsp;<code>nums</code>,每次 <strong>操作</strong>&nbsp;会从中选择一个元素并 <strong>将该元素的值减少&nbsp;1</strong></p>
<p>如果符合下列情况之一,则数组&nbsp;<code>A</code>&nbsp;就是 <strong>锯齿数组</strong></p>
<ul>
<li>每个偶数索引对应的元素都大于相邻的元素,即&nbsp;<code>A[0] &gt; A[1] &lt; A[2] &gt; A[3] &lt; A[4] &gt; ...</code></li>
<li>或者,每个奇数索引对应的元素都大于相邻的元素,即&nbsp;<code>A[0] &lt; A[1] &gt; A[2] &lt; A[3] &gt; A[4] &lt; ...</code></li>
</ul>
<p>返回将数组&nbsp;<code>nums</code>&nbsp;转换为锯齿数组所需的最小操作次数。</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre><strong>输入:</strong>nums = [1,2,3]
<strong>输出:</strong>2
<strong>解释:</strong>我们可以把 2 递减到 0或把 3 递减到 1。
</pre>
<p><strong>示例 2</strong></p>
<pre><strong>输入:</strong>nums = [9,6,1,6,2]
<strong>输出:</strong>4
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= nums.length &lt;= 1000</code></li>
<li><code>1 &lt;= nums[i] &lt;= 1000</code></li>
</ul>