foo.c: In function 'Unique':
foo.c:5:6: warning: unused variable 'cnt' [-Wunused-variable]
  int cnt=0;
      ^~~
foo.c: In function 'main':
foo.c:25:17: warning: unused variable 'p' [-Wunused-variable]
 {int n1,n2,n3,i,p,a1[10001],a2[10001],a3[10001],a[10001];
                 ^
foo.c:27:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d%d",&n1,&n2,&n3);
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:28:18: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 for(i=0;i<n1;i++)scanf("%d",&a1[i]);
                  ^~~~~~~~~~~~~~~~~~
foo.c:29:18: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 for(i=0;i<n2;i++)scanf("%d",&a2[i]);
                  ^~~~~~~~~~~~~~~~~~
foo.c:30:18: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 for(i=0;i<n3;i++)scanf("%d",&a3[i]);
                  ^~~~~~~~~~~~~~~~~~

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