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<b><font face="Arial, Helvetica, sans-serif" size="5" color="#FF0000">5.9 Forests</font><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">
【<font color="#0033CC">definition</font>】A forest is a set of n >= 0 disjoint trees
(1) <font color="#FF0000">Transforming a forest into a binary tree</font>
【<font color="#0033CC">definition</font>】If T 1, ..., T n is a forest of trees, then the binary
tree corresponding to this forest, denoted by B(T 1, ..., T n):
1. is empty, if n = 0
2. has root equal to root (T 1); has left subtree equal to
B(T 11, T 12, ..., T 1m), where T 11, T 12, ..., T 1m are the
subtrees of root (T 1); and has right subtree B(T 2, ..., T n)
<img src="IMAGE/text5-z3a.gif" width="285" height="157"> </font></b></pre>
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