c 2b 2b 2d vectors

1// Create a vector containing n 
2//vectors of size m, all u=initialized with 0
3vector<vector<int> > vec( n , vector<int> (m, 0));  

1// finding size of a square matrix
2myVector[0].size();

1myVector[
2  Vector[0, 4, 2, 5],
3  Vector[1, 4, 2]
4];
5
6/*When you call for myVector[1].size() it would return 3 and [0] would return 4.
7
8For the amount of rows (int vectors) in the 2d vector, you can just use myVector.size()
9
10You can run this to see it in actions*/

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[i].push_back(temp); 
11    }
12}

1
2int main() 
3{ 
4    int row = 5; // size of row 
5    int colom[] = { 5, 3, 4, 2, 1 }; 
6  
7    vector<vector<int> > vec(row);  // Create a vector of vector with size equal to row. 
8  	for (int i = 0; i < row; i++) { 
9  		int col;  
10        col = colom[i]; 
11  		vec[i] = vector<int>(col); //Assigning the coloumn size of vector
12        for (int j = 0; j < col; j++) 
13            vec[i][j] = j + 1; 
14    } 
15  
16    for (int i = 0; i < row; i++) { 
17        for (int j = 0; j < vec[i].size(); j++) 
18            cout << vec[i][j] << " "; 
19        cout << endl; 
20    } 
21} 

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}