Eroare de compilare: user.cpp:1:21: error: iostream.h: No such file or directory user.cpp:2:20: error: fstream.h: No such file or directory user.cpp:3:17: error: algo.h: No such file or directory user.cpp:4: error: ‘ifstream’ does not name a type user.cpp:5: error: ‘ofstream’ does not name a type user.cpp: In function ‘int main()’: user.cpp:8: error: ‘f’ was not declared in this scope user.cpp:11: error: ‘sort’ was not declared in this scope user.cpp:15: error: ‘g’ was not declared in this scope