leetcode-problemset/leetcode-cn/originData/qiu-12n-lcof.json

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            "categoryTitle": "LCOF",
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            "title": "求1+2+…+n LCOF",
            "titleSlug": "qiu-12n-lcof",
            "content": "<p>English description is not available for the problem. Please switch to Chinese.</p>\r\n",
            "translatedTitle": "求1+2+…+n",
            "translatedContent": "<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>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入:</strong> n = 3\n<strong>输出:&nbsp;</strong>6\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入:</strong> n = 9\n<strong>输出:&nbsp;</strong>45\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>限制：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n&nbsp;&lt;= 10000</code></li>\n</ul>\n",
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