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add leetcode problem-cn part2

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2022-03-27 20:38:29 +08:00
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<p><code>1+2+...+n</code> 要求不能使用乘除法、for、while、if、else、switch、case等关键字及条件判断语句A?B:C</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre><strong>输入:</strong> n = 3
<strong>输出:&nbsp;</strong>6
</pre>
<p><strong>示例 2</strong></p>
<pre><strong>输入:</strong> n = 9
<strong>输出:&nbsp;</strong>45
</pre>
<p>&nbsp;</p>
<p><strong>限制:</strong></p>
<ul>
<li><code>1 &lt;= n&nbsp;&lt;= 10000</code></li>
</ul>