<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68644962">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>> + if ( minscore2 > scores[s] && s != minloc) //second smallest
> + {
> + minscore2 = scores[s];
> + minloc2 = s;
> + }
> + }
> +
> + // Add or subtract 1 to create second-lowest scoring vector.
> + additionalProbingBins(positions[minloc2], 1) += actions[minloc2];
> + return;
> + }
> +
> + // General case: more than 2 perturbation vectors require use of minheap.
> +
> + // Sort everything in increasing order.
> + arma::Col<long long unsigned int> sortidx = arma::sort_index(scores);
</pre>
<p>I think this was mentioned somewhere else, so forgive any redundancy, but probably <code>arma::uword</code> should be used here instead of <code>long long unsigned int</code>. You can just use <code>arma::uvec</code> since that is a typedef of <code>arma::Col<arma::uword></code>.</p>
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