Eroare de compilare: user.cpp:1:20: error: fstream.h: No such file or directory user.cpp:2: error: ‘ifstream’ does not name a type user.cpp:3: error: ‘ofstream’ does not name a type user.cpp: In function ‘int main()’: user.cpp:15: error: ‘f’ was not declared in this scope user.cpp:18: error: ‘qsort’ was not declared in this scope user.cpp:24: error: ‘g’ was not declared in this scope user.cpp:29: error: ‘g’ was not declared in this scope