s="special">)</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Requires</strong></span>: old_root is a node of a tree.</p>
<p><span class="bold"><strong>Effects</strong></span>: Rebalances the subtree rooted at old_root.</p>
<p><span class="bold"><strong>Returns</strong></span>: The new root of the subtree.</p>
<p><span class="bold"><strong>Throws</strong></span>: Nothing.</p>
<p><span class="bold"><strong>Complexity</strong></span>: Linear. </p>
</li>
<li class="listitem">
<pre clas