Vector demonstration

Constructing 1
Copying 1
Destructor for 1

Constructing 2
Copying 1
Copying 2
Destructor for 1
Destructor for 2

Constructing 3
Copying 1
Copying 2
Copying 3
Destructor for 1
Destructor for 2
Destructor for 3

Constructing 4
Copying 4
Destructor for 4

Constructing 5
Copying 1
Copying 2
Copying 3
Copying 4
Copying 5
Destructor for 1
Destructor for 2
Destructor for 3
Destructor for 4
Destructor for 5

Destructor for 1
Destructor for 2
Destructor for 3
Destructor for 4
Destructor for 5