Eroare de compilare: user.cpp:1:21: error: fstream.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:34: error: ‘ifstream’ was not declared in this scope user.cpp:34: error: expected ‘;’ before ‘fin’ user.cpp:35: error: ‘ofstream’ was not declared in this scope user.cpp:35: error: expected ‘;’ before ‘fout’ user.cpp:36: error: ‘fin’ was not declared in this scope user.cpp:58: error: ‘fout’ was not declared in this scope user.cpp: In function ‘void qsort(int, int)’: user.cpp:65: warning: unused variable ‘ax’