ass="identifier">source</span><span class="special">)</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">i</span> <span class="special">&lt;&lt;</span>  <span class="string">" "</span><span class="special">;</span>

<span class="identifier">output</span><span class="special">:</span>
<span class="number">1</span> <span class="number">1</span> <span class="number">2</span> <span class