Eroare de compilare: main.cpp:5:13: error: variable 'std::ifstream cin' has initializer but incomplete type ifstream cin("perechi.in"); ^ main.cpp:6:14: error: variable 'std::ofstream cout' has initializer but incomplete type ofstream cout("perechi.out"); ^ main.cpp:8:9: error: 'int div' redeclared as different kind of symbol int n,p,div=1,d=2; ^~~ In file included from /usr/include/c++/6/cstdlib:75:0, from /usr/include/c++/6/ext/string_conversions.h:41, from /usr/include/c++/6/bits/basic_string.h:5420, from /usr/include/c++/6/string:52, from /usr/include/c++/6/bits/locale_classes.h:40, from /usr/include/c++/6/bits/ios_base.h:41, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/ostream:38, from /usr/include/c++/6/iostream:39, from main.cpp:1: /usr/include/stdlib.h:788:14: note: previous declaration 'div_t div(int, int)' extern div_t div (int __numer, int __denom) ^~~ main.cpp: In function 'int desc(int)': main.cpp:20:11: error: invalid operands of types '<unresolved overloaded function type>' and 'int' to binary 'operator*' div=div * (2*p+1); ~~~~^~~~~~~~~ main.cpp:25:9: error: cannot resolve overloaded function 'div' based on conversion to type 'int' return div; ^~~ main.cpp: In function 'int main()': main.cpp:29:2: error: reference to 'cin' is ambiguous cin>>n; ^~~ main.cpp:5:10: note: candidates are: <typeprefixerror>cin ifstream cin("perechi.in"); ^~~ In file included from main.cpp:1:0: /usr/include/c++/6/iostream:60:18: note: std::istream std::cin extern istream cin; /// Linked to standard input ^~~ main.cpp:33:2: error: reference to 'cout' is ambiguous cout<<rez; ^~~~ main.cpp:6:10: note: candidates are: <typeprefixerror>cout ofstream cout("perechi.out"); ^~~~ In file included from main.cpp:1:0: /usr/include/c++/6/iostream:61:18: note: std::ostream std::cout extern ostream cout; /// Linked to standard output ^~~~ Non zero exit status: 1