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<p>你有一个数组&nbsp;<code>nums</code>&nbsp;,它只包含 <strong></strong>&nbsp;整数,所有正整数的数位长度都 <strong>相同</strong>&nbsp;</p>
<p>两个整数的 <strong>数位差</strong>&nbsp;指的是两个整数 <b>相同</b>&nbsp;位置上不同数字的数目。</p>
<p>请你返回 <code>nums</code>&nbsp;<strong>所有</strong>&nbsp;整数对里,<strong>数位差之和。</strong></p>
<p>&nbsp;</p>
<p><strong class="example">示例 1</strong></p>
<div class="example-block">
<p><span class="example-io"><b>输入:</b>nums = [13,23,12]</span></p>
<p><b>输出:</b>4</p>
<p><strong>解释:</strong><br />
计算过程如下:<br />
-&nbsp;<strong>1</strong>3 和&nbsp;<strong>2</strong>3 的数位差为&nbsp;1 。<br />
- 1<strong>3</strong> 和 1<strong>2</strong>&nbsp;的数位差为&nbsp;1 。<br />
-&nbsp;<strong>23</strong>&nbsp;<strong>12</strong>&nbsp;的数位差为&nbsp;2 。<br />
所以所有整数数对的数位差之和为&nbsp;<code>1 + 1 + 2 = 4</code>&nbsp;</p>
</div>
<p><strong class="example">示例 2</strong></p>
<div class="example-block">
<p><span class="example-io"><b>输入:</b>nums = [10,10,10,10]</span></p>
<p><span class="example-io"><b>输出:</b>0</span></p>
<p><strong>解释:</strong><br />
数组中所有整数都相同,所以所有整数数对的数位不同之和为 0 。</p>
</div>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>2 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>
<li><code>1 &lt;= nums[i] &lt; 10<sup>9</sup></code></li>
<li><code>nums</code>&nbsp;中的整数都有相同的数位长度。</li>
</ul>