想要实现这样的目标：
代码：
\usepackage[table]{xcolor}
\usepackage{forest}
\setlength{\arrayrulewidth}{.1mm}
\setlength{\tabcolsep}{12pt}
\renewcommand{\arraystretch}{2}
\arrayrulecolor[HTML]{AAAAAA}
\begin{document}
\begin{tabular}{c c}
{
\rowcolors{2}{white}{gray!20}
\begin{tabular}{|c|c|}
\hline
TID & Items \\
\hline
1 & {a, b, e} \\
2 & {a, b, c, d} \\
3 & {a, c, d} \\
4 & {a, c, e} \\
5 & {b, c, } \\
6 & {a} \\
7 & {a, b, c} \\
8 & {b, d, e} \\
9 & {a, c} \\
10 & {a, b, d, e} \\
\hline
\hline
Item & Pointer \\
\hline
a & \\
b & \\
c & \\
d & \\
e & \\
\hline
\end{tabular}
} & {
\begin{tabular}{c c}
\begin{forest}
[null
[a: 1
[b: 1
[e: 1]
]
]
]
\end{forest}&
\begin{forest}
[null
[a: 2
[b: 2
[e: 1]
[c: 1
[d: 1]
]
]
]
]
\end{forest}\\
\end{tabular}
}
\end{tabular}
\end{document}
它是什么样子的：
问题：无法分隔两个表格。无法在底部表格单元格和图形节点之间放置箭头。
答案1
使用 ，tikzmark您可以获得\tikzmarknode表和\subnodes树的 ，然后可以将它们连接起来overlay tikzpicture（使用remember picture）。
\documentclass{article}
\usepackage[table]{xcolor}
\usepackage{forest}
\usetikzlibrary{tikzmark,arrows.meta,bending}
\setlength{\arrayrulewidth}{.1mm}
\setlength{\tabcolsep}{12pt}
\renewcommand{\arraystretch}{2}
\arrayrulecolor[HTML]{AAAAAA}
\begin{document}
\begin{tabular}{c c}
{
\rowcolors{2}{white}{gray!20}
\begin{tabular}{|c|c|}
\hline
TID & Items \\
\hline
1 & {a, b, e} \\
2 & {a, b, c, d} \\
3 & {a, c, d} \\
4 & {a, c, e} \\
5 & {b, c, } \\
6 & {a} \\
7 & {a, b, c} \\
8 & {b, d, e} \\
9 & {a, c} \\
10 & {a, b, d, e} \\
\hline
\hline
Item & Pointer \\
\hline
\tikzmarknode{a}{a} & \\
\tikzmarknode{b}{b} & \\
c & \\
d & \\
e & \\
\hline
\end{tabular}
} & {
\begin{tabular}{c c}
\begin{forest}
[null
[\subnode{a1}{a: 1}
[\subnode{b1}{b: 1}
[e: 1]
]
]
]
\end{forest}&
\begin{forest}
[null
[a: 2
[b: 2
[e: 1]
[c: 1
[d: 1]
]
]
]
]
\end{forest}\\
\end{tabular}
}\begin{tikzpicture}[overlay,remember picture,>={Stealth[bend]}]
\draw[dashed,red,->] (a) -- ++ (2,0) to[out=0,in=180] (a1);
\draw[dashed,red,->] (b) -- ++ (2,0) to[out=0,in=180] (b1);
\end{tikzpicture}%
\end{tabular}
\end{document}
或者，如果您希望在pointer列中启动这些箭头。
\documentclass{article}
\usepackage[table]{xcolor}
\usepackage{forest}
\usetikzlibrary{tikzmark,arrows.meta,bending}
\setlength{\arrayrulewidth}{.1mm}
\setlength{\tabcolsep}{12pt}
\renewcommand{\arraystretch}{2}
\arrayrulecolor[HTML]{AAAAAA}
\begin{document}
\begin{tabular}{c c}
{
\rowcolors{2}{white}{gray!20}
\begin{tabular}{|c|c|}
\hline
TID & Items \\
\hline
1 & {a, b, e} \\
2 & {a, b, c, d} \\
3 & {a, c, d} \\
4 & {a, c, e} \\
5 & {b, c, } \\
6 & {a} \\
7 & {a, b, c} \\
8 & {b, d, e} \\
9 & {a, c} \\
10 & {a, b, d, e} \\
\hline
\hline
Item & Pointer \\
\hline
a & \tikzmarknode{a}{\vphantom{b}}\\
b & \tikzmarknode{b}{\vphantom{b}}\\
c & \tikzmarknode{c}{\vphantom{b}} \\
d & \tikzmarknode{d}{\vphantom{b}} \\
e & \tikzmarknode{e}{\vphantom{b}} \\
\hline
\end{tabular}
} & {
\begin{tabular}{c c}
\begin{forest}
[null
[\subnode{a1}{a: 1}
[\subnode{b1}{b: 1}
[e: 1]
]
]
]
\end{forest}&
\begin{forest}
[null
[a: 2
[b: 2
[e: 1]
[c: 1
[\subnode{d2}{d}: 1]
]
]
]
]
\end{forest}\\
\end{tabular}
}\begin{tikzpicture}[overlay,remember picture,>={Stealth[bend]}]
\draw[dashed,red,->] (a) -- ++ (1.5,0)coordinate (aux) --
([xshift=1em]aux|-a1) -- (a1);
\draw[dashed,red,->] (b) -- ++ (1.7,0)
coordinate (aux) -- ([xshift=1em]aux|-b1) -- (b1);
\draw[dashed,red,->] (d) -- ++ (2.3,0)
coordinate (aux) -- ([xshift=5em]aux|-d2) -- (d2);
\end{tikzpicture}%
\end{tabular}
\end{document}
这是一个不使用的版本\tikzmarknode。
\documentclass{article}
\usepackage[table]{xcolor}
\usepackage{forest}
\usetikzlibrary{tikzmark,arrows.meta,bending}
\setlength{\arrayrulewidth}{.1mm}
\setlength{\tabcolsep}{12pt}
\renewcommand{\arraystretch}{2}
\arrayrulecolor[HTML]{AAAAAA}
\begin{document}
\begin{tabular}{c c}
{
\rowcolors{2}{white}{gray!20}
\begin{tabular}{|c|c|}
\hline
TID & Items \\
\hline
1 & {a, b, e} \\
2 & {a, b, c, d} \\
3 & {a, c, d} \\
4 & {a, c, e} \\
5 & {b, c, } \\
6 & {a} \\
7 & {a, b, c} \\
8 & {b, d, e} \\
9 & {a, c} \\
10 & {a, b, d, e} \\
\hline
\hline
Item & Pointer \\
\hline
a & \tikzmark{a}\\
b & \tikzmark{b}\\
c & \tikzmark{c}\\
d & \tikzmark{d}\\
e & \tikzmark{e}\\
\hline
\end{tabular}
} & {
\begin{tabular}{c c}
\begin{forest}
[null
[\subnode{a1}{a: 1}
[\subnode{b1}{b: 1}
[e: 1]
]
]
]
\end{forest}&
\begin{forest}
[null
[a: 2
[b: 2
[e: 1]
[c: 1
[\subnode{d2}{d}: 1]
]
]
]
]
\end{forest}\\
\end{tabular}
}\begin{tikzpicture}[overlay,remember picture,>={Stealth[bend]}]
\draw[dashed,red,->] (pic cs:a) -- ++ (1.5,0)coordinate (aux) --
([xshift=1em]aux|-a1) -- (a1);
\draw[dashed,red,->] (pic cs:b) -- ++ (1.7,0)
coordinate (aux) -- ([xshift=1em]aux|-b1) -- (b1);
\draw[dashed,red,->] (pic cs:d) -- ++ (2.3,0)
coordinate (aux) -- ([xshift=5em]aux|-d2) -- (d2);
\end{tikzpicture}%
\end{tabular}
\end{document}