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1780-check-if-number-is-a-sum-of-powers-of-three/README.md

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+<h2><a href="https://leetcode.com/problems/check-if-number-is-a-sum-of-powers-of-three/">1780. Check if Number is a Sum of Powers of Three</a></h2><h3>Medium</h3><hr><p>Given an integer <code>n</code>, return <code>true</code> <em>if it is possible to represent </em><code>n</code><em> as the sum of distinct powers of three.</em> Otherwise, return <code>false</code>.</p>
+
+<p>An integer <code>y</code> is a power of three if there exists an integer <code>x</code> such that <code>y == 3<sup>x</sup></code>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> n = 12
+<strong>Output:</strong> true
+<strong>Explanation:</strong> 12 = 3<sup>1</sup> + 3<sup>2</sup>
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> n = 91
+<strong>Output:</strong> true
+<strong>Explanation:</strong> 91 = 3<sup>0</sup> + 3<sup>2</sup> + 3<sup>4</sup>
+</pre>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> n = 21
+<strong>Output:</strong> false
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= n &lt;= 10<sup>7</sup></code></li>
+</ul>