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{
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"question": {
"questionId": "367",
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"categoryTitle": "Algorithms",
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"title": "Valid Perfect Square",
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"content": "<p>Given a <strong>positive</strong> integer <i>num</i>, write a function which returns True if <i>num</i> is a perfect square else False.</p>\n\n<p><b>Follow up:</b> <b>Do not</b> use any built-in library function such as <code>sqrt</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<pre><strong>Input:</strong> num = 16\n<strong>Output:</strong> true\n</pre><p><strong>Example 2:</strong></p>\n<pre><strong>Input:</strong> num = 14\n<strong>Output:</strong> false\n</pre>\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= num &lt;= 2^31 - 1</code></li>\n</ul>\n",
"translatedTitle": "有效的完全平方数",
"translatedContent": "<p>给定一个 <strong>正整数</strong> <code>num</code> ,编写一个函数,如果 <code>num</code> 是一个完全平方数,则返回 <code>true</code> ,否则返回 <code>false</code> 。</p>\n\n<p><strong>进阶:不要</strong> 使用任何内置的库函数,如  <code>sqrt</code> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1</strong></p>\n\n<pre>\n<strong>输入:</strong>num = 16\n<strong>输出:</strong>true\n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<pre>\n<strong>输入:</strong>num = 14\n<strong>输出:</strong>false\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= num <= 2^31 - 1</code></li>\n</ul>\n",
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