loat) Minimum birth time for the given diagram </span>

<span class="sd">    &quot;&quot;&quot;</span>
    <span class="k">try</span><span class="p">:</span>
        <span class="n">m</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="n">Dgm</span><span class="p">[:,</span> <span class="mi">0</span><span class="p">])</span>
        <span class="k">return</span> <span class="n">m</span>
    <span class="k">except</span><span class="p">:</span>
        <span class=