Los Valley - sort of a random number P1059 obviously on set + + universal header files

 

 

 

#include<bits/stdc++.h>
using namespace std;
set<int> s;
int a[105];
int main(){
    int n;
    cin>>n;
    for(int i=0;i<n;++i){
        cin>>a[i];
        s.insert(a[i]);
    }
    cout<<s.size()<<endl;
    while(!s.empty()){
        cout<<*s.begin()<<" ";
        s.erase(s.begin());
    }
    return 0;
}