#代码最后的p”does not name a type"以及“was not declared"

#include<bits/stdc++.h>
using namespace std;
int main(){
	set<int> s;
	int n;
	int a[100];
	cin>>n;
	for(int i=0;i<n;i++)
	{
		cin>>a[i];
		s.insert(a[i]);
	}
	cout<<s.size()<<endl;
	for(auto p=s.begin();p!=s.end();p++)
	{
		cout<<*p<<" ";
	}
}