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add leetcode problem-cn part6

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小墨
2022-03-27 20:56:26 +08:00
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算法题（国内版）/problem (Chinese)/有效的完全平方数 [valid-perfect-square].html Normal file
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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>