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leetcode-problemset/leetcode-cn/problem (Chinese)/有效的完全平方数 [valid-perfect-square].html
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<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>
<p><strong>进阶:不要</strong> 使用任何内置的库函数,如  <code>sqrt</code></p>
<p> </p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>num = 16
<strong>输出:</strong>true
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>num = 14
<strong>输出:</strong>false
</pre>
<p> </p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 <= num <= 2^31 - 1</code></li>
</ul>