#include <iostream> /* C++ iostream C++98/11 */
#include <string> /* C++ strings C++98/11 */
// #include <boost/regex.hpp> /* RegEx Boost */
//#include <boost/algorithm/string/replace.hpp>
#include <cassert>
#include <cstring>
using namespace std;
int main() {
string s;
s.push_back('a');
s.push_back('\0');
s.push_back('a');
// assert(s.length() == 3);
// cout<<s.c_str()<<endl;
cout<<s.data()<<endl;
// const char* p = s.c_str();
// cout<<strlen(p)<<endl;
}
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