1#include <bits/stdc++.h>
2using namespace std;
3int main()
4{
5 int rows = 2;
6 int cols = 2;
7 int val = 1;
8 vector< vector<int> > v(rows, vector<int> (cols, val)); /*creates 2d vector “v[rows][cols]” and initializes all elements to “val == 1” (default value is 0)*/
9 v[0][0] = 5;
10 v[1][1] = 4;
11 cout << v[0][0] << endl; //Output: 5cout << v[1][0] << endl; //Output: 1return 0;}