初始化结构向量内的向量

Question

I have a vector of structs that contain a vector, and i don't know how to initialize the fields inside the struct. I have the following code:

struct member {
  vector<pair<int, int> > rival_result;
  int matches;
}
vector<member> ranking(n);

I want to set the size of the vector inside the struct to the size of the other vector and have 0 in all the fields(matches and the integers of the pair vector). N can be a very big number so it can't be done manually. Thanks.

Answer 1

Write a constructor for member first that sets the size of your vector:

struct member {
    explicit member (int n) : rival_result(n), matches(0) { }
    vector<pair<int, int> > rival_result;
    int matches;
};

Now create your vector:

vector<member> ranking(n, member(n));