用tikzpicture画树，节点折叠问题

Question

我正在尝试绘制类似树的数据结构，tikzpicture但有些节点被折叠了，我不明白为什么。

你能帮助我理解为什么吗？

\documentclass[letterpaper,12pt]{article}
\usepackage{tikz}
\usetikzlibrary{shapes}
\begin{document}
\begin{center}
    \begin{tikzpicture}
        \tikzstyle{bplus}=[rectangle split, rectangle split horizontal,rectangle split ignore empty parts,draw]
        \tikzstyle{every node}=[bplus]
        \tikzstyle{level 1}=[sibling distance=70mm]
        \tikzstyle{level 2}=[sibling distance=30mm]
        \tikzstyle{level 3}=[sibling distance=30mm]
        \tikzstyle{level 4}=[sibling distance=30mm]
        \node[rectangle split parts=10] {2 \nodepart{two} 4 \nodepart{three} 3 \nodepart{four} 1 \nodepart{five} 6 
        \nodepart{six} 7 \nodepart{seven} 8 \nodepart{eight} 9 \nodepart{nine} 1 \nodepart{ten} 7} [->]
        child {node[rectangle split parts=5] {2 \nodepart{two} 4 \nodepart{three} 3 \nodepart{four} 1 \nodepart{five} 6 }
            child[sibling distance=25mm]{node {2 \nodepart{two} 4}}
            child[sibling distance=25mm]{node {3 \nodepart{two} 1 \nodepart{three} 6}}
        } 
        child {node[rectangle split parts=6] {6 \nodepart{two} 7 \nodepart{three} 8 \nodepart{four} 9 \nodepart{five} 1 \nodepart{six} 7}
            child[sibling distance=25mm]{node {6 \nodepart{two} 7 \nodepart{three} 8}
            child[sibling distance=25mm]{node {6}}
            child[sibling distance=25mm]{node {7 \nodepart{two} 8}
                child{node {7}}
                child{node {8}}
            }
            }
            child[sibling distance=25mm] {node {9 \nodepart{two} 1 \nodepart{three} 7}
                child{node {9}}
                child{node {1 \nodepart{two} 7}
                    child{node {1}}
                    child[sibling distance=25mm]{node {7}}
                }
            }
        }
        ;\end{tikzpicture}
    \end{center}
\end{document}

Answer 1

您无需forest关心兄弟姐妹之间的距离：

\documentclass[margin=3mm]{standalone}
\usepackage{forest}
\usetikzlibrary{arrows.meta,
                shapes.multipart}

\begin{document}
    \begin{forest}
for tree = {
    rectangle split,
    rectangle split horizontal,
    rectangle split parts=10,
    rectangle split ignore empty parts,
    draw,
    %
    parent anchor=south,
    child  anchor=north,
    calign=edge midpoint,
    edge = {-Stealth, semithick},
    l sep=6mm,
    where level=0{s sep=11mm}{s sep=3mm},
            }
[4\nodepart{two} 2 \nodepart{two}   4 \nodepart{three} 3 \nodepart{four} 1 \nodepart{five} 6
  \nodepart{six} 7 \nodepart{seven} 8 \nodepart{eight} 9 \nodepart{nine} 1 \nodepart{ten}  7
    [2\nodepart{two} 2 \nodepart{two} 4 \nodepart{three} 3 \nodepart{four} 1 \nodepart{five} 6
       [2\nodepart{two} 4]
       [3\nodepart{two} 1 \nodepart{three} 6]
    ]
    [6\nodepart{two} 7 \nodepart{three} 8 \nodepart{four} 9 \nodepart{five} 1
      \nodepart{six} 7,fit=band 
       [6\nodepart{two} 7 \nodepart{three} 8 
            [6]
            [7\nodepart{two} 8
                [7]
                [8]
            ]
       ]
       [9\nodepart{two} 1 \nodepart{three} 7
            [9]
            [1\nodepart{two} 7
                [1]
                [7]
            ]
       ]
    ]
]
    \end{forest}
\end{document}

Answer 2

\documentclass[letterpaper,12pt]{article}
\usepackage{tikz}
\usetikzlibrary{shapes}
\begin{document}
\begin{center}
    \begin{tikzpicture}
        \tikzstyle{bplus}=[rectangle split, rectangle split horizontal,rectangle split ignore empty parts,draw]
        \tikzstyle{every node}=[bplus]
        \tikzstyle{level 1}=[sibling distance=70mm]
        \tikzstyle{level 2}=[sibling distance=30mm]
        \tikzstyle{level 3}=[sibling distance=30mm]
        \tikzstyle{level 4}=[sibling distance=30mm]
        \node[rectangle split parts=10] {2 \nodepart{two} 4 \nodepart{three} 3 \nodepart{four} 1 \nodepart{five} 6 
        \nodepart{six} 7 \nodepart{seven} 8 \nodepart{eight} 9 \nodepart{nine} 1 \nodepart{ten} 7} [->]
        child {node[rectangle split parts=5] {2 \nodepart{two} 4 \nodepart{three} 3 \nodepart{four} 1 \nodepart{five} 6 }
            child[sibling distance=25mm]{node {2 \nodepart{two} 4}}
            child[sibling distance=25mm]{node {3 \nodepart{two} 1 \nodepart{three} 6}}
        } 
        child {node[rectangle split parts=6] {6 \nodepart{two} 7 \nodepart{three} 8 \nodepart{four} 9 \nodepart{five} 1 \nodepart{six} 7}
            child[sibling distance=25mm]{node {6 \nodepart{two} 7 \nodepart{three} 8}
            child[sibling distance=10mm]{node {6}}
            child[sibling distance=10mm]{node {7 \nodepart{two} 8}
                child[sibling distance=16mm]{node {7}}
                child[sibling distance=16mm]{node {8}}
            }
            }
            child[sibling distance=25mm] {node {9 \nodepart{two} 1 \nodepart{three} 7}
                child[sibling distance=20mm]{node {9}}
                child[sibling distance=20mm]{node {1 \nodepart{two} 7}
                    child[sibling distance=15mm]{node {1}}
                    child[sibling distance=15mm]{node {7}}
                }
            }
        }
        ;\end{tikzpicture}
    \end{center}
\end{document}