pan> <span
            class="n">ll</span>
    <span class="n">ll</span><span class="o">.</span><span class="n">pred</span> <span class="o">=</span> <span
            class="n">rl</span>
    <span class="n">new_root</span> <span class="o">=</span> <span class="n">_union_treap</span><span class="p">(</span><span
            class="n">T1</span><span class="p">,</span> <span class="n">T2</span><span class="p">)</span>
    <span class="n">new_root</span><span class="o">.</span><span class="n">parent</span> <spa