Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:13:15: error: conflicting declaration ‘std::ofstream f’ ofstream f("prefix.out"); ^ user.cpp:12:14: error: ‘f’ has a previous declaration as ‘std::ifstream f’ ifstream f("prefix.in"); ^ user.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<=strlen(s+1);i++) ^ user.cpp:33:17: error: ‘g’ was not declared in this scope g<<j<<endl; ^ user.cpp:37:13: error: ‘g’ was not declared in this scope g<<0<<endl; ^