我的代码：
\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{matrix,positioning,quotes}
\begin{document}
\definecolor{myblue}{RGB}{80,80,160}
\definecolor{mygreen}{RGB}{80,160,80}
\begin{tikzpicture}[thick,amat/.style={matrix of nodes,nodes in empty cells,
row sep=1em,draw,dashed,rounded corners,
nodes={draw,solid,circle,execute at begin node={$v_{\the\pgfmatrixcurrentrow}$}}},
amat2/.style={matrix of nodes,nodes in empty cells,
row sep=1em,draw,dashed,rounded corners,
nodes={draw,solid,circle,execute at begin node={$u_{\the\pgfmatrixcurrentrow}$}}},
fsnode/.style={fill=myblue},
ssnode/.style={fill=mygreen}]
\matrix[amat,nodes=fsnode,label=above:$V^{1}$] (mat1) {\\
};
\matrix[amat2,right=2cm of mat1,nodes=ssnode,label=above:$V^{2}$] (mat2) {\\
\\
\\};
\draw (mat1-1-1) edge["$1$"] (mat2-1-1)
(mat1-1-1) edge["$2$"] (mat2-2-1);
\draw (mat1-1-1) edge["$3$"] (mat2-3-1);
\end{tikzpicture}
\end{document}
我得到两组V^1和V^2：1. 我需要将边值最大的节点（即我的代码中权重为 3 的边）的名称V^2设为红色。
答案1
您可以red通过添加来填充任何节点|[fill=red]|。我希望正确解释您的指示。
\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{matrix,positioning,quotes}
\begin{document}
\definecolor{myblue}{RGB}{80,80,160}
\definecolor{mygreen}{RGB}{80,160,80}
\begin{tikzpicture}[thick,amat/.style={matrix of nodes,nodes in empty cells,
row sep=1em,draw,dashed,rounded corners,
nodes={draw,solid,circle,execute at begin node={$v_{\the\pgfmatrixcurrentrow}$}}},
amat2/.style={matrix of nodes,nodes in empty cells,
row sep=1em,draw,dashed,rounded corners,
nodes={draw,solid,circle,execute at begin node={$u_{\the\pgfmatrixcurrentrow}$}}},
fsnode/.style={fill=myblue},
ssnode/.style={fill=mygreen}]
\matrix[amat,nodes=fsnode,label=above:$V^{1}$] (mat1) {
\\
};
\matrix[amat2,right=2cm of mat1,nodes=ssnode,label=above:$V^{2}$] (mat2) {\\
\\
|[fill=red]|\\};
\draw (mat1-1-1) edge["$1$"] (mat2-1-1)
(mat1-1-1) edge["$2$"] (mat2-2-1);
\draw (mat1-1-1) edge["$3$"] (mat2-3-1);
\end{tikzpicture}
\end{document}
