how to print 2D vector in c++ by stl code example

Example 1: print 2d vector c++

for(int i=0; i<v.size(); i++) 
		for(int j=0; j<v[i].size(); j++) 
  			cout<<v[i][j]<<" ";
        cout<<endl;

Example 2: how to print a 2d array in c++

for (int i = 0; i < m; i++) 
{ 
   for (int j = 0; j < n; j++) 
   { 
      cout << arr[i][j] << " "; 
   } 
     
   // Newline for new row 
   cout << endl; 
}