<p>I thought that <code>std::pair&lt;&gt;</code> would be better to use here since it is a more well-known class, and allows us to avoid declaring the <code>Candidate</code> class many different places in the code.  Do you think there is a compelling reason to keep the <code>Candidate</code> class?  If the thought is that the <code>Candidate</code> name makes it clear, we can just add a comment like this:</p>

<pre><code>// Holds an (index, score) pair.
std::pair&lt;size_t, double&gt; candidate;
</code></pre>

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