I'm trying to push_back numbers into a 2D vector that's composed of 1 row and 1 column.
vector< vector <int>>array;
array.push_back(vector<int>(3));
array[0].push_back(2);
cout << array[0][0] << endl;
I expected this to return 3, but it returns 0. Why's that?
vector<int>(3) creates a vector containing 3 elements with value 0.
- Constructs the container with count default-inserted instances of T. No copies are made.
If you want a vector containing 1 element with value 3, you can change to vector<int>{3}.
- Constructs the container with the contents of the initializer list init.
e.g.
array.push_back(vector<int>{3});