Why is the answer to this question 1?

Question

https://www.sololearn.com/post/173148/?ref=app

Answer 1

You can probably see it a bit more clearly if we mark A(int) as explicit.
In which case std::vector<A> v( 5, 1 ); is illegal and becomes std::vector<A> v( 5, A( 1 ) );
( the copy constructor is called for the rest )
As you can probably see, you're creating a temporary variable.
It gets destructed immediately after the call, which results in 'cnt' getting incremented once in the destructor.

Answer 2

Thanks ~ swim ~ . Incrementing A::cnt by 5 at the time of termination of the program due to the destruction of the 5 object elements was obvious to me. It was the creation and destruction of the temporary object that was not obvious to me.

Answer 3

Yep. Imma dumb haha just figured that out hah

Answer 4

Because there is a destructor that increments it