29 lines
580 B
C++
29 lines
580 B
C++
#include <bits/stdc++.h>
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using namespace std;
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//map排序(key)的比较器
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struct cmpFunction {
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bool operator()(const int &k1, const int &k2) const {
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return k1 < k2;
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}
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};
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int main() {
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int n;
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cin >> n;
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map<int, int, cmpFunction> _map;
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for (int i = 0; i < n; ++i) {
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int c;
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cin >> c;
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_map[c]++;
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}
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//输出结果
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cout << _map.size() << endl;
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for (map<int, int>::iterator iter = _map.begin(); iter != _map.end(); ++iter) {
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cout << iter->first << " ";
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}
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return 0;
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}
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