Eroare de compilare: main.cpp:7:36: error: conflicting declaration 'long long int f' long long int n, m, a, b, c, d, e, f, k; ^ main.cpp:4:10: note: previous declaration as 'std::ifstream f' ifstream f("muzica.in"); ^ main.cpp: In function 'int main()': main.cpp:13:10: error: no match for 'operator>>' (operand types are 'std::ifstream {aka std::basic_ifstream<char>}' and 'std::ifstream {aka std::basic_ifstream<char>}') f>>f; //citim cele n melodii ale lui Vasile si le introducem in set ~^~~ main.cpp:13:10: note: candidate: operator>>(int, int) <built-in> main.cpp:13:10: note: no known conversion for argument 2 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'int' In file included from /usr/include/c++/6/fstream:38:0, from main.cpp:1: /usr/include/c++/6/istream:120:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__istream_type& (*)(std::basic_istream<_CharT, _Traits>::__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>] operator>>(__istream_type& (*__pf)(__istream_type&)) ^~~~~~~~ /usr/include/c++/6/istream:120:7: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&) {aka std::basic_istream<char>& (*)(std::basic_istream<char>&)}' /usr/include/c++/6/istream:124:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__ios_type& (*)(std::basic_istream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::__ios_type = std::basic_ios<char>] operator>>(__ios_type& (*__pf)(__ios_type&)) ^~~~~~~~ /usr/include/c++/6/istream:124:7: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&) {aka std::basic_ios<char>& (*)(std::basic_ios<char>&)}' /usr/include/c++/6/istream:131:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>] operator>>(ios_base& (*__pf)(ios_base&)) ^~~~~~~~ /usr/include/c++/6/istream:131:7: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'std::ios_base& (*)(std::ios_base&)' /usr/include/c++/6/istream:168:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>] operator>>(bool& __n) ^~~~~~~~ /usr/include/c++/6/istream:168:7: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'bool&' /usr/include/c++/6/istream:172:7: note: candidate: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>] operator>>(short& __n); ^~~~~~~~ /usr/include/c++/6/istream:172:7: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'short int&' /usr/include/c++/6/istream:175:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>] operator>>(unsigned short& __n) ^~~~~~~~ /usr/include/c++/6/istream:175:7: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'short unsigned int&' /usr/include/c++/6/istream:179:7: note: candidate: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>] operator>>(int& __n); ^~~~~~~~ /usr/include/c++/6/istream:179:7: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'int&' /usr/include/c++/6/istream:182:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>] operator>>(unsigned int& __n) ^~~~~~~~ /usr/include/c++/6/istream:182:7: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'unsigned int&' /usr/include/c++/6/istream:186:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>] operator>>(long& __n) ^~~~~~~~ /usr/include/c++/6/istream:186:7: note: no known conversion for argument 1 from 'std::ifstream {aka std::basic_ifstream<char>}' to 'long int&' Non zero exit status: 1