[code deleted]

Edited by author 02.04.2019 21:28

Edited by author 02.04.2019 21:49

Edited by moderator 19.11.2019 23:34

Use sqrtl.

Change

while (!cin.eof()){
    cin >> a;
    mass.push_back(a);
}
mass.erase(mass.end()-1);

To

while (cin >> a)
{
    mass.push_back(a);
}