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leetcode-cn/problem (Chinese)/求1+2+…+n [qiu-12n-lcof].html Normal file
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<p>求 <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>