Firstly, we need to make sure your initial code is correct. The providedcodeseems to have some missing parts. In C++, to initialize a vector of a certain size, you need to specify the type of elements the vector holds.For example, if ticketList is avector of integers, we should initialize it like so:```c++#include#includeusing namespace std;int main() {vector ticketList(3);}```The line `vector ticketList(3);` creates a vector of integers named `ticketList` with a size of 3.To remove the last element from a vector in C++, we use the `pop_back()` function. Thisfunctionremoves the last element in the vector, effectively reducing the container size by one.Let's put it all together:```c++#include#includeusing namespace std;int main() {vector ticketList(3);ticketList.pop_back();}```With `ticketList.pop_back();`, we are removing the last element from `ticketList`.Remember that if the vector is empty and you call `pop_back()`, it will result in undefined behavior. Always ensure the vector has elements before calling `pop_back()`.To know more about "Code":brainly.com/question/29330362#SPJ11...

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