Eroare de compilare: user.cpp:4:1: error: ‘ifstream’ does not name a type ifstream cin("perm2.in"); ^~~~~~~~ user.cpp:5:1: error: ‘ofstream’ does not name a type ofstream cout("perm2.out"); ^~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:26:13: warning: unused variable ‘produs’ [-Wunused-variable] int n,i,produs = 1; ^~~~~~ user.cpp:27:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:29:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&p[i]); ^