What is the easiest way to initialize a std::vector with hardcoded elements?

Question

I can create an array and initialize it like this:

int a[] = {10, 20, 30};

How do I create a std::vector and initialize it sim

Answer 1

Before C++ 11 :

Method 1=>

vector v(arr, arr + sizeof(arr)/sizeof(arr[0]));
vectorv;

Method 2 =>

 v.push_back(SomeValue);

C++ 11 onward below is also possible

vectorv = {1, 3, 5, 7};