Answer:
On time means at a particular designated time, i.e. neither especially early nor late. The train is scheduled to arrive on time at 13:36. In time means early enough, i.e. before a deadline or another cutoff.
Explanation:
The reference to the root of the tree should be set to null
<h3>Can the root of a binary tree be null?</h3>
- Only the subtrees are nulled out, the root always remains and will never be set to null.
<h3>What is null root?</h3>
- null-, root. -null- comes from Latin, where it has the meaning "none; not one.
- '' This meaning is found in such words as: annul, null, nullify.
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