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#include <iostream>
#include <utility>
#include <vector>
using namespace std;
struct POD {
POD() { a = 2; }
POD(int x) { a = x; }
int a;
};
int
main(void)
{
vector<pair<char,char> > a;
pair<char,char> p = make_pair('a','b');
a.push_back(p);
vector<pair<char, char> > b(a);
cout << b[0].first << endl;
b[0].first = 'c';
cout << b[0].first << endl;
vector<POD> w;
POD x; x.a=3;
w.push_back(x);
POD y(x);
vector<POD> q(w);
cout << q[0].a << endl;
return 0;
}
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