<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r67988389">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +    {
&gt; +      if ( minscore2 &gt; scores[s] &amp;&amp; s != minloc) //second smallest
&gt; +      {
&gt; +        minscore2 = scores[s];
&gt; +        minloc2 = s;
&gt; +      }
&gt; +    }
&gt; +
&gt; +    // add or subtract 1 to create second-lowest scoring vector
&gt; +    additionalProbingBins(positions[minloc2], 1) += actions[minloc2];
&gt; +    return;
&gt; +    
&gt; +  }
&gt; +
&gt; +  // sort everything in increasing order
&gt; +  arma::Col&lt;long long unsigned int&gt; sortidx = arma::sort_index(scores);
</pre>
<p>Why <code>long long unsigned int</code>?  Either <code>size_t</code> or possibly <code>arma::uword</code> (I prefer the former but sometimes it is not possible) should work here.</p>

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