Eroare de compilare: user.cpp:3:1: error: ‘ifstream’ does not name a type ifstream f("fact.in"); ^ user.cpp:4:1: error: ‘ofstream’ does not name a type ofstream g("fact.out"); ^ user.cpp: In function ‘int main()’: user.cpp:9:5: error: ‘f’ was not declared in this scope f>>p; ^ user.cpp:10:14: error: ‘g’ was not declared in this scope if(p==0) g<<1; ^ user.cpp:11:19: error: ‘g’ was not declared in this scope else if(p==1) g<<120; ^ user.cpp:12:10: error: ‘g’ was not declared in this scope else g<<(p*2)-1; ^