matrix in vector c 2b 2b

1vector<vector <int> > matrix;
2
3cout << "Row's Length: " << matrix.size();
4cout<< "Column's Length: "<< matrix[0].size();

1std::vector<vector<int>> d;
2//std::vector<int> d;
3cout<<"Enter the N number of ship and port:"<<endl;
4cin>>in;
5cout<<"\Enter preference etc..:\n";
6for(i=0; i<in; i++){ 
7cout<<"ship"<<i+1<<":"<<' ';
8    for(j=0; j<in; j++){
9    cin>>temp;
10    d.push_back(temp);// I don't know how to push_back here!!
11    }
12}