Description: For a given graph G, if there is a program of two kinds of color on the vertex shader, so any one edge
Connect two vertices with different colors, then G can be 2-colored.
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File list (Check if you may need any files):
图的2着色\2color.cpp
.........\input.txt
.........\output.txt
.........\图的着色.pdf
.........\新建 文本文档.txt
图的2着色