leetcode-problemset/leetcode/problem/sum-of-digits-in-base-k.html

<p>Given an integer <code>n</code> (in base <code>10</code>) and a base <code>k</code>, return <em>the <strong>sum</strong> of the digits of </em><code>n</code><em> <strong>after</strong> converting </em><code>n</code><em> from base </em><code>10</code><em> to base </em><code>k</code>.</p>

<p>After converting, each digit should be interpreted as a base <code>10</code> number, and the sum should be returned in base <code>10</code>.</p>

<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>

<pre>
<strong>Input:</strong> n = 34, k = 6
<strong>Output:</strong> 9
<strong>Explanation: </strong>34 (base 10) expressed in base 6 is 54. 5 + 4 = 9.
</pre>

<p><strong>Example 2:</strong></p>

<pre>
<strong>Input:</strong> n = 10, k = 10
<strong>Output:</strong> 1
<strong>Explanation: </strong>n is already in base 10. 1 + 0 = 1.
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= n &lt;= 100</code></li>
	<li><code>2 &lt;= k &lt;= 10</code></li>
</ul>