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- #include<iostream>
- #include<algorithm>
- using namespace std;
- int main() {
- int n;
- cin >> n;
- int v[n];
- for (int i = 0; i < n; i++) {
- cin >> v[i];
- }
- sort(v, v + n);
- int m = unique(v, v + n) - v;
- cout << m << endl;
- for (int i = 0; i < m; i++) {
- cout << v[i] << " ";
- }
- cout << endl;
- return 0;
- }
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