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add leetcode problem-cn part1

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算法题（国内版）/problem (Chinese)/统计位数为偶数的数字 [find-numbers-with-even-number-of-digits].html Normal file
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<p>给你一个整数数组&nbsp;<code>nums</code>，请你返回其中位数为&nbsp;<strong>偶数</strong>&nbsp;的数字的个数。</p>
<p>&nbsp;</p>
<p><strong>示例 1：</strong></p>
<pre><strong>输入：</strong>nums = [12,345,2,6,7896]
<strong>输出：</strong>2
<strong>解释：
</strong>12 是 2 位数字（位数为偶数）&nbsp;
345 是 3 位数字（位数为奇数）&nbsp;&nbsp;
2 是 1 位数字（位数为奇数）&nbsp;
6 是 1 位数字 位数为奇数）&nbsp;
7896 是 4 位数字（位数为偶数）&nbsp;&nbsp;
因此只有 12 和 7896 是位数为偶数的数字
</pre>
<p><strong>示例 2：</strong></p>
<pre><strong>输入：</strong>nums = [555,901,482,1771]
<strong>输出：</strong>1
<strong>解释： </strong>
只有 1771 是位数为偶数的数字。
</pre>
<p>&nbsp;</p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 &lt;= nums.length &lt;= 500</code></li>
<li><code>1 &lt;= nums[i] &lt;= 10^5</code></li>
</ul>