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BJP5 Self-Check 17.5: traversal2

Language/Type: Java binary trees tree traversals
Author: Robert Baxter (on 2019/09/19)

Write the elements of the tree below in the order they would be seen by a pre-order, in-order, and post-order traversal.

            +----+
            | 19 |
            +----+
           /      \
          /        \
      +----+      +----+
      | 47 |      | 63 |
      +----+      +----+
     /      \           \
    /        \           \
+----+      +----+      +----+
| 23 |      | -2 |      | 94 |
+----+      +----+      +----+
           /                  \
          /                    \
      +----+                  +----+
      | 55 |                  | 28 |
      +----+                  +----+
pre-order
in-order
post-order

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