Submission #66303294

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

using pii = pair<int, int>;
using ll = long long;
using ull = unsigned long long;

constexpr int N = 200000 + 1;

int a[N];

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	int n;
	cin >> n;
	for (int i = 1; i <= n; ++i) {
		cin >> a[i];
	}
	sort(a + 1, a + n + 1);
	n = unique(a + 1, a + n + 1) - a - 1;
	cout << n << '\n';
	for (int i = 1; i <= n; ++i) {
		cout << a[i] << ' ';
	}
	cout << '\n';
	return 0;
}

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