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#include <iostream>
using namespace std;
 
int main() {
	int array[][] = { 1, 2, 3, 4,
	                  5, 6, 7, 8
	                };
 
	for(auto& j : array)
	{
		for(auto& i : j)
		{
			std::cout << i << '\n';
		}
	}
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:5:14: error: declaration of ‘array’ as multidimensional array must have bounds for all dimensions except the first
  int array[][] = { 1, 2, 3, 4,
              ^
prog.cpp:9:16: error: ‘array’ was not declared in this scope
  for(auto& j : array)
                ^
prog.cpp:11:17: error: unable to deduce ‘auto&&’ from ‘j’
   for(auto& i : j)
                 ^

Standard output is empty