#include <iostream>
#include <vector>
using namespace std;
int main()
{
{
vector <bool> d(42);
for (bool &&e : d) e = false;
for (bool b : d) cout << b;
cout << '\n';
}
{
vector <bool> d(42);
for (bool &&e : d) e = true;
for (bool b : d) cout << b;
cout << '\n';
}
{
vector <bool> d(42);
for (auto &&e : d) e = false;
for (bool b : d) cout << b;
cout << '\n';
}
{
vector <bool> d(42);
for (auto &&e : d) e = true;
for (bool b : d) cout << b;
cout << '\n';
}
{
vector <bool> d(42);
for (vector<bool>::reference &&e : d) e = true;
for (bool b : d) cout << b;
cout << '\n';
}
}
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