Eroare de compilare: main.cpp:3:1: error: 'ifstream' does not name a type ifstream fin("permutari.in"); ^~~~~~~~ main.cpp:4:1: error: 'ofstream' does not name a type ofstream fout("permutari.out"); ^~~~~~~~ main.cpp: In function 'void back(int)': main.cpp:13:9: error: 'fout' was not declared in this scope fout<<perm[i]<<" "; ^~~~ main.cpp:14:9: error: 'fout' was not declared in this scope fout<<endl; ^~~~ main.cpp: In function 'int main()': main.cpp:30:5: error: 'fin' was not declared in this scope fin>>n; ^~~ main.cpp:28:6: warning: unused variable 'lvl' [-Wunused-variable] {int lvl; ^~~ Non zero exit status: 1