Eroare de compilare: user.cpp:3:20: error: fstream.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:17: error: variable ‘std::ifstream fin’ has initializer but incomplete type user.cpp:18: error: variable ‘std::ofstream fout’ has initializer but incomplete type user.cpp:23: error: invalid conversion from ‘int*’ to ‘int’ user.cpp:23: error: initializing argument 1 of ‘int ggt(int, int)’ user.cpp:23: error: invalid conversion from ‘int*’ to ‘int’ user.cpp:23: error: initializing argument 2 of ‘int ggt(int, int)’