Did you figure what was the issue?
I also get compilation error.
My code works in CLion, it has compilation error when I submit it here...


Main.cpp
F:\temp\22502613.36143\Main.cpp(9) : error C2057: expected constant expression
F:\temp\22502613.36143\Main.cpp(9) : error C2466: cannot allocate an array of constant size 0
F:\temp\22502613.36143\Main.cpp(9) : error C2133: 'DNA' : unknown size
F:\temp\22502613.36143\Main.cpp(13) : error C2679: binary '>>' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)
        istream(1000): could be 'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,signed char *)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(1007): or       'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,signed char &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(1014): or       'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,unsigned char *)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(1021): or       'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,unsigned char &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(155): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_istream<_Elem,_Traits> &(*)(std::basic_istream<_Elem,_Traits> &))'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(161): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_ios<_Elem,_Traits> &(*)(std::basic_ios<_Elem,_Traits> &))'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(168): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::ios_base &(*)(std::ios_base &))'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(175): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::_Bool &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(194): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(short &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(228): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned short &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(247): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(int &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(273): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned int &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(291): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(long &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(309): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(__w64 unsigned long &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(329): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(__int64 &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(348): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned __int64 &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(367): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(float &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(386): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(double &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(404): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(long double &)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(422): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(void *&)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        istream(441): or       'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_streambuf<_Elem,_Traits> *)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        while trying to match the argument list '(std::istream, std::string)'
F:\temp\22502613.36143\Main.cpp(21) : error C2057: expected constant expression
F:\temp\22502613.36143\Main.cpp(21) : error C2466: cannot allocate an array of constant size 0
F:\temp\22502613.36143\Main.cpp(21) : error C2133: 'result' : unknown size
F:\temp\22502613.36143\Main.cpp(44) : error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)
        ostream(653): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(700): or       'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(738): or       'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(785): or       'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(909): or       'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(916): or       'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(923): or       'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(930): or       'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(170): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_ostream<_Elem,_Traits> &(*)(std::basic_ostream<_Elem,_Traits> &))'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(176): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_ios<_Elem,_Traits> &(*)(std::basic_ios<_Elem,_Traits> &))'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(183): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::ios_base &(*)(std::ios_base &))'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(190): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::_Bool)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(210): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(short)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(243): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned short)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(263): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(__w64 int)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(288): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(__w64 unsigned int)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(308): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(328): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(__w64 unsigned long)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(349): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(__int64)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(369): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned __int64)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(390): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(float)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(410): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(double)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(430): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long double)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(450): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(const void *)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        ostream(470): or       'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_streambuf<_Elem,_Traits> *)'
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        while trying to match the argument list '(std::ostream, std::string)'