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Leetfs committed Sep 13, 2024
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![层次模型结构图](./image1.png)

- 以树的形式
- ****的形式
- 有且仅有一个节点,并且没有双亲,称为根节点
- 有且仅有一个其它

## 网状模型

![网状模型结构图](./image2.png)

- 以网的形式
- **网/图**的形式
- 有一个以上的节点没有父节点
- 节点可以有多于一个的父节点

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