foo.cc: In function 'void findmaxs(node*)':
foo.cc:35:13: warning: statement has no effect [-Wunused-value]
   35 |         for(sp;sp->next!=NULL;presp=sp,sp=sp->next)
      |             ^~
foo.cc: In function 'int main()':
foo.cc:49:13: warning: statement has no effect [-Wunused-value]
   49 |         for(p1;p1<a1+n1;p1++)
      |             ^~
foo.cc:51:13: warning: statement has no effect [-Wunused-value]
   51 |         for(p2;p2<a2+n2;p2++)
      |             ^~

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