Telephone numbers - Codesize - Puzzle discussion

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Telephone numbers - Codesize

A validator is missing in the test suite. That is when one of the phone numbers is equal to the number N of telephone numbers. Otherwise the first line can be ignored in certain codes.
For example:

3
1
2
3

should return 3.

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I agree. The lack of this validator makes incorrect shorter solutions pass as valid while they shouldn’t.

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