foo.c: In function 'main':
foo.c:4:33: warning: unused variable 't' [-Wunused-variable]
     int n,i,a[10000],j,flag=0,k,t,num=0;
                                 ^
foo.c:5:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ^~~~~~~~~~~~~~
foo.c:8:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[i]);
   ^~~~~~~~~~~~~~~~~