/span><span class="identifier">find</span><span class="special">(</span><span class="identifier">user_id</span><span class="special">);</span>
<span class="keyword">if</span><span class="special">(</span> <span class="identifier">id_iter</span> <span class="special">!=</span> <span class="identifier">people</span><span class="special">.</span><span class="identifier">right</span><span class="special">.</span><span class="identifier">end</span><span class="special">()</span> <span class="special">)</span>
<s