#include <vector>
#include <iostream>
using namespace std;
int main()
{
vector<bool> vec;
vec.push_back(true);
vec.push_back(false);
vec.push_back(true);
vec.push_back(true);
vec.data();
for(size_t i = 0; i < vec.size(); i++)
{
if(vec[i])
cout<<"true"<<endl;
else
cout<<"false"<<endl;
}
return 0;
}