vector of vectors c 2b 2b

1#include <iostream>
2#include <vector>
3using namespace std;  
4
5int main()
6{
7    vector<vector<int> > buff;
8
9    for(int i = 0; i < 10; i++)
10    {
11        vector<int> temp; // create an array, don't work directly on buff yet.
12        for(int j = 0; j < 10; j++)
13            temp.push_back(i); 
14 
15        buff.push_back(temp); // Store the array in the buffer
16    }
17
18    for(int i = 0; i < buff.size(); ++i)
19    {
20        for(int j = 0; j < buff[i].size(); ++j)
21            cout << buff[i][j];
22        cout << endl;
23    }
24
25    return 0;
26}

1vector<vector<int>> matrix(x, vector<int>(y));
2
3This creates x vectors of size y, filled with 0's.
4

1#include <iostream> 
2#include <vector> 
3using namespace std; 
4  
5int main() 
6{ 
7	int n = 5;
8	int m = 7;
9	//Create a vector containing n vectors of size m and initalize them to 0.
10	vector<vector<int>> vec(n, vector<int>(m, 0));
11
12	for (int i = 0; i < vec.size(); i++) //print them out
13	{
14		for (int j = 0; j < vec[i].size(); j++)
15		{
16			cout << vec[i][j] << " ";
17		}
18		cout << endl;
19	}
20}

1#include <iostream>
2#include <vector>
3using namespace std;
4
5int main() {
6  //vector element size
7  const int size = 4; 
8  //vector with int data type
9  //all elements are equal to 4
10  vector<int> myVect (size, 4);
11
12  for (int i=0; i<size; i++) {
13    cout << "Vector index(" << i <<") is: "<< myVect[i] << endl; 
14  }
15  return 0;
16}

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} 

1vector<vector<data_type>> vec;