henry2001d 2017-11-04 18:38:46
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#include <iostream>
#include <algorithm>
using namespace std;
const int maxn=1001;
bool sum[maxn];
int num[maxn];
int main()
{
int n,a;
cin >> n;
for (int i=1;i<=n;i++)
{
cin >> a;
sum[a]=1;
}
int cnt=0;
for (int i=1;i<=1000;i++)
{
if (sum[i]==1)
{
num[cnt]=i;
cnt++;
}
}
cout << cnt << endl;
sort (num,num+cnt);
for (int i=0;i<cnt;i++)
cout << num[i] << " ";
return 0;
}