foo.cc: In function 'node* searchremove(node*, node*, int)':
foo.cc:44:14: warning: statement has no effect [-Wunused-value]
   44 |         for (srp; srp != NULL;presrp=srp,srp = srp->next)
      |              ^~~
foo.cc:41:13: warning: unused variable 's' [-Wunused-variable]
   41 |         int s = 0;
      |             ^
foo.cc: In function 'int main()':
foo.cc:87:14: warning: statement has no effect [-Wunused-value]
   87 |         for (p1; p1 < a1 + n1; p1++)
      |              ^~
foo.cc:89:14: warning: statement has no effect [-Wunused-value]
   89 |         for (p2; p2 < a2 + n2; p2++)
      |              ^~
foo.cc:91:14: warning: statement has no effect [-Wunused-value]
   91 |         for (p3; p3 < a3 + n3; p3++)
      |              ^~
foo.cc:93:15: warning: unused variable 'head1' [-Wunused-variable]
   93 |         node* head1 = ordercreate(a1, n1);      node* head2 = ordercreate(a2, n2);  node* head3 = ordercreate(a3, n3);
      |               ^~~~~

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