/in/foo.cc: In function 'int main()':
/in/foo.cc:10:10: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
  for(int i;i<m;i++)
          ^
/in/foo.cc:13:10: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
  for(int i;i<m;i++)
          ^
/in/foo.cc:18:10: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
  for(int i;i<m;i++)
          ^
/in/foo.cc:19:11: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
   for(int j;j<n;j++)
           ^
/in/foo.cc:14:11: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
   for(int j;j<n;j++)
           ^
/in/foo.cc:11:11: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
   for(int j;j<n;j++)
           ^