1. Using binary tree preservation list 2. Binary Tree-based sequence of the first order to establish a tree 3. According to pre-order, in sequence, after the binary tree traversal (c election 1)

test5
.....\HalfSearch.class
.....\HalfSearch.java
.....\Search.class
.....\Search.java
.....\SearchTest.class
.....\SearchTest.java
.....\Sort.class
.....\Sort.java
.....\SortTest.class
.....\SortTest.java
.....\tast3.class

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