foo.cc: In function 'int symmDiffSet(int*, int, int*, int, int*)':
foo.cc:93:6: warning: unused variable 'i' [-Wunused-variable]
   93 |  int i,n3=0,n,n4;
      |      ^
foo.cc: In function 'int main()':
foo.cc:134:12: warning: unused variable 'N' [-Wunused-variable]
  134 |  int const N=100;
      |            ^
foo.cc:135:15: warning: unused variable 'i' [-Wunused-variable]
  135 |  int n1,n2,n3,i;
      |               ^

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