class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    constexpr <span class="keywordtype">char</span> ERR_DIR_GRAPH[] = <span class="stringliteral">&quot;Graph is directed&quot;</span>;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    constexpr <span class="keywordtype">char</span> ERR_NO_WEIGHTED_EDGE[] = <span class="stringliteral">&quot;Edge are not Weighted&quot;</span>;</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31<