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<p align="center"><font size="6" color="#FFFFFF"><span style="mso-bidi-font-size: 10.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><b>第六章<span style="mso-bidi-font-size: 10.0pt; font-family: Times New Roman; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">
</span><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-bidi-font-family: Times New Roman; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">树与二叉树</span></b></span></font></p>
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</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">在前面几章里讨论的数据结构都属于线性结构，线性结构的特点是逻辑结构简单，易于进行查找、插入和删除等操作，其主要用于对客观世界中具有单一的前驱和后继的数据关系进行描述，而现实中的许多事物的关系并非这样简单，如人类社会的族谱、各种社会组织机构以及城市交通、通讯等，这些事物中的联系都是非线性的，采用非线性结构进行描绘会更明确和便利。</span></font></b></p>
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</b></font></span><font size="5" color="#FFFFFF"><b><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"">所谓非线性结构是指，在该结构中至少存在一个数据元素，有两个或两个以上的直接前驱（或直接后继）元素。树型结构和图型就是其中十分重要的非线性结构，可以用来描述客观世界中广泛存在的层次结构和网状结构的关系，如前面提到的族谱、城市交通等。在本书的第六、七章将重点讨论这两类非线性结构的有关概念、存储结构、在各种存储结构上所实施的一些运算以及有关的应用实例。</span></b></font></p>
<font size="5" color="#FFFFFF"><b><span style="mso-spacerun: yes; mso-bidi-font-size: 10.0pt; font-family: Times New Roman; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">
</span><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-bidi-font-family: Times New Roman; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">本章对树型结构及其中最简单、应用十分广泛的二叉树结构进行讨论。</span></b></font>
<p><b><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-bidi-font-family: Times New Roman; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><font size="5" color="#FFFFFF">6.1
</font><a href="ds6.1.HTM"><font size="5" color="#FFFF00">
树的定义和基本术语</font></a></span></b></p>
<p><b><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-bidi-font-family: Times New Roman; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><font size="5" color="#FFFFFF">6.2
</font><a href="ds6.2.HTM"><font size="5" color="#FFFF00">
二叉树</font></a></span></b></p>
<p><b><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-bidi-font-family: Times New Roman; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><font size="5" color="#FFFFFF">6.3
</font><a href="ds6.3.HTM"><font size="5" color="#FFFF00">
遍历二叉树和线索二叉树</font></a></span></b></p>
<p><b><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-bidi-font-family: Times New Roman; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><font size="5" color="#FFFFFF">6.4
</font><a href="ds6.4.HTM"><font size="5" color="#FFFF00">
树和森林</font></a></span></b></p>
<p><b><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-bidi-font-family: Times New Roman; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><font size="5" color="#FFFFFF">6.5
</font><a href="ds6.5.HTM"><font size="5" color="#FFFF00">
赫夫曼树及其应用</font></a></span></b></p>
<p><b><span style="mso-bidi-font-size: 10.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman; mso-bidi-font-family: Times New Roman; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><a href="ds6习.HTM"><font size="5" color="#FFFF00">习题</font></a></span></b></p>
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