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#include <iostream>
using namespace std;
 
int main() {
	int n;
 
	do
	{
		cin >> n;
		int matriz [n][n];
 
		for (int i=0; i<n;i++)
		{
			for (int j=0; j<i;j++)
			{
				matriz[i][j] = i-j;
			}
			for (int j=i; j<n;j++)
			{
				matriz[i][j] = j-i;
			}
 
		}
 
		for (int i=0; i<n;i++)
		{
			for (int j=0; j<n-1;j++)
				cout << matriz[i][j]<<" ";
			cout << matriz[i][j]<<endl;
		}
	}while (n!= 0);
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:29:22: error: name lookup of 'j' changed for ISO 'for' scoping [-fpermissive]
    cout << matriz[i][j]<<endl;
                      ^
prog.cpp:29:22: note: (if you use '-fpermissive' G++ will accept your code)

Standard output is empty