Eroare de compilare: user.cpp:2:20: error: fstream.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:28: error: variable ‘std::ifstream f’ has initializer but incomplete type user.cpp:29: error: variable ‘std::ofstream g’ has initializer but incomplete type user.cpp:40: warning: comparison between signed and unsigned integer expressions user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp:26: warning: unused variable ‘li’