What is the difference between std::set and std::vector?

Question

I am learning STL now. I read about set container. I have question when you want to use set? After reading description of set it looks like it is u

Answer 1

The simple difference is that set can contain only unique values, and it is sorted. So you can use it for the cases where you need to continuously sort the values after every insert / delete.

set a;
vector b;
for (int i = 0; i < 10; ++i)
{
    int val = rand() % 10;
    a.insert(val);
    b.push_back(val);
}
cout << "--SET---\n"; for (auto i : a) cout << i << ","; cout << endl;
cout << "--VEC---\n"; for (auto j : b) cout << j << ","; cout << endl;

The output is

--SET---
0,1,2,4,7,8,9,
--VEC---
1,7,4,0,9,4,8,8,2,4,