foo.c: In function 'SetInter':
foo.c:47:6: warning: unused variable 'j' [-Wunused-variable]
   47 |  int j;
      |      ^
foo.c: In function 'main':
foo.c:67:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   67 |  scanf("%d %d %d", &n1, &n2, &n3);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:73:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   73 |   scanf("%d", &a1[i]);
      |   ^~~~~~~~~~~~~~~~~~~
foo.c:76:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   76 |   scanf("%d", &a2[i]);
      |   ^~~~~~~~~~~~~~~~~~~
foo.c:79:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   79 |   scanf("%d", &a3[i]);
      |   ^~~~~~~~~~~~~~~~~~~

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