im gunna write everything assuming that you have using namespace std; if you dont then Everytime before vector. you need std::
vector< vector<dataType> > vectorName;
****the space between > > is Extremely important.
you can create single(1-D) vectors.
but there are Lots of ways
just like a 2D array. you can use
vectorName [I][j] to access everything.
hope this helps!!