C++ std::vector<int> issue

Question

In the main function, I'm initializing a variable of type std::vector <int> like this:

std::vector <int> edges[9]

and then add my elements to it.

what i wanna know is there a way to initialize edges with variables ?? To do something like this: (already know that this writing gives error)

int n=9;
std::vector <int> edges[n]

Answer 1

If you want to set the size of the vector, use std::vector<int> foo(9) . What you are doing is initializing an array with nine separate vectors.

For a variable, you can do std::vector<int> foo(n) .

Answer 2

If I understood your question correctly, you want to have a vector initialized with "9" int space and you want to initialize the same with a particular value "10" for example

Here is how you can achieve the same.

  std::vector <int> edges;
  edges.resize(9);
  cout<<"size =>"<<edges.size()<<endl;
  std::fill(edges.begin(), edges.end(), 10);

resize reserves the initial size and std::fill can be used to fill the same with desired value.

Hope this helps