The main difference between them is coloring requirements:every D-edge at least has two vertices colored differently, while every C-edge at least has two vertices of the same color.
它们的主要区别在于染色要求上：每一D-超边至少有两点异色，每一C-超边至少有两点同色。
The main difference between them is coloring requirements:every D-edge at least has two vertices colored differently, while every C-edge at least has two vertices of the same color.
它们的主要区别在于染色要求上：每一D-超边至少有两点异色，每一C-超边至少有两点同色。
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