Is the time complexity of the empty algorithm O(0)?

Question

So given the following program:

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Is the time complexity of this program O(0)? In other words, is 0 O(0)?

I thought answering this in a separate question

Answer 1

No. It's O(c) by convention whenever you don't have dependence on input size, where c is any positive constant (typically 1 is used - O(1) = O(12.37)).