/in/foo.cc: In function 'int coco(int)':
/in/foo.cc:14:9: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return s;
         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:20:21: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(coco(m)==coco(n)&&coco(m)==m+n+1)
     ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
/in/foo.cc:20:21: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/foo.cc:20:21: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]