foo.c: In function 'Unique':
foo.c:5:13: warning: unused variable 'num' [-Wunused-variable]
    5 |         int num = 0;
      |             ^~~
foo.c: In function 'SetInter':
foo.c:39:13: warning: unused variable 'cc' [-Wunused-variable]
   39 |         int cc = Unique(x, c);
      |             ^~
foo.c: In function 'main':
foo.c:58:41: warning: unused variable 'y' [-Wunused-variable]
   58 |         int x = SetInter(n1, a, n2, b), y = SetInter(n1, a, n3, c);
      |                                         ^
foo.c:58:13: warning: unused variable 'x' [-Wunused-variable]
   58 |         int x = SetInter(n1, a, n2, b), y = SetInter(n1, a, n3, c);
      |             ^

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