doc/pgcp.html

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        <h1 id="平面图三着色">平面图三着色</h1>
<p><a href="../GraphTheory/1.html">平面图</a>的三着色问题也是 NPC 问题，这也可以通过一般<a href="gcp.html">图三着色问题</a>归约到该问题证明。</p>

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