foo.cc: In function 'int symmDiffSet(int*, int, int*, int, int*)':
foo.cc:94:1: warning: no return statement in function returning non-void [-Wreturn-type]
   94 | }
      | ^
foo.cc: In function 'int main()':
foo.cc:130:12: warning: unused variable 'N' [-Wunused-variable]
  130 |  int const N=100;
      |            ^
foo.cc:131:15: warning: unused variable 'i' [-Wunused-variable]
  131 |  int n1,n2,n3,i;
      |               ^

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