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OI-codes/Luogu/P1059/P1059.cpp

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#include <iostream>
2022-06-01 01:45:41 +00:00
#include <algorithm>
#include <vector>
using std::cin;
using std::cout;
using std::endl;
int n, x;
std::vector<int> a;
int main() {
cin >> n;
for (int i = 0; i < n; i++) {
cin >> x;
a.push_back(x);
}
std::sort(a.begin(), a.end());
a.erase(std::unique(a.begin(), a.end()), a.end());
cout << a.size() << endl;
for (int i : a) {
cout << i << ' ';
}
cout << endl;
return 0;
}