/in/foo.cc: In function 'int main()':
/in/foo.cc:12:7: error: invalid types 'int[int]' for array subscript
    a[i][j]=count++;
       ^
/in/foo.cc:17:19: error: invalid types 'int[int]' for array subscript
   printf("%4d",a[i][j]);
                   ^
/in/foo.cc:19:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
   printf("");
            ^