Eroare de compilare: main.cpp: In function 'bool folosit(int)': main.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=s.size();++i) ~^~~~~~~~~~ main.cpp: In function 'int cojo(int, int)': main.cpp:23:9: warning: unused variable 'ok' [-Wunused-variable] int ok=0; ^~ main.cpp: In function 'int main()': main.cpp:42:5: error: reference to 'cin' is ambiguous cin>>s; ^~~ main.cpp:7:10: note: candidates are: std::ifstream cin ifstream cin("expresie3.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:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=s.size();++i) ~^~~~~~~~~~ main.cpp:62:13: error: reference to 'cout' is ambiguous cout<<char(i+97)<<' '<<a[i]<<'\n'; ^~~~ main.cpp:8:10: note: candidates are: std::ofstream cout ofstream cout("expresie3.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