Suggest some ideas to improve this code

Question

https://sololearn.com/compiler-playground/cCgvBq6c6kXg/?ref=app

Answer 1

https://sololearn.com/compiler-playground/chp5PIJeRbSR/?ref=app

Answer 2

Unless there is a requirement to use an array, the main code could be reduced and allow an indefinite number of input values:

int main()
{
int a;

puts("Enter the elements:");
while (scanf("%d", &a)!=EOF)
check(a);

return 0;
}