| Tree Efficiency |
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| • | A
tree is balanced |
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| – | if
its balance factor is zero and its subtrees are |
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| also
balanced |
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| – | but,
since this definition occurs so seldom, an |
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| alternate
definition is more generally applied: |
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| – | a
binary tree is balanced if the height of its |
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| subtrees
differs by no more than one (i.e., the |
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| balance
factors can be -1, 0, or 1) and its |
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| subtrees
are also balanced. |
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