no">  141</span>&#160;    CheckNodeBounds(node1);</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;    CheckNodeBounds(node2);</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;    <span class="keywordflow">if</span> (class_size_[node1] &lt; class_size_[node2]) {</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;      std::swap(node1, node2);</div>
<div class="line"><a name="l00145"></a><span class="lineno