/in/foo.cc: In function 'void findmaxs(node*)':
/in/foo.cc:35:8: warning: statement has no effect [-Wunused-value]
  for(sp;sp->next!=NULL;presp=sp,sp=sp->next)
        ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:49:8: warning: statement has no effect [-Wunused-value]
  for(p1;p1<a1+n1;p1++)
        ^
/in/foo.cc:51:8: warning: statement has no effect [-Wunused-value]
  for(p2;p2<a2+n2;p2++)
        ^