rc = 0; arc &lt; num_arcs; ++arc) {</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment">//   components.AddArc(tail[arc], head[arc]);</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">// }</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">// int num_connected_components = components.GetNumberOfConnectedComponents();</span><