Assume you define a vector in the following way: vector vec;

Assign the value 10 to the first element of this vector. What is the statement you would use?

vec[0].push_back(10)

Explanation:

Given

Declaration: vector <int> vec

Required

Assign 10 to the first element

This can be done using the push_back keyword.

The syntax is:     vectorname[position].push_back(value);

In this case:

vectorname = vec

position = 0 i.e. first element

value = 10

So, we have:

vec[0].push_back(10)

you have to be a ambitious

i think the answer is a or d