#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>
#include <fstream>
using namespace std;
void readSet(vector<int>& v, istream_iterator<int>& input) {
int size = *input++;
while (size--) {
v.push_back(*input++);
}
}
int main() {
istream_iterator<int> input(cin);
vector<int> a, b;
readSet(a, input);
readSet(b, input);
sort(a.begin(), a.end());
sort(b.begin(), b.end());
vector<int> intersection;
set_intersection(
a.begin(), a.end(),
b.begin(), b.end(),
back_inserter(intersection)
);
intersection.erase(
unique(intersection.begin(), intersection.end()), intersection.end()
);
cout << "Ilosc powtarzajacych sie: " << intersection.size() << "\n";
cout << "Liczby:\n";
copy(
intersection.begin(),
intersection.end(),
ostream_iterator<int>(cout, "\n")
);
return 0;
}
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