Compilare: user.cpp: In function ‘int main()’: user.cpp:9:9: warning: unused variable ‘n’ [-Wunused-variable] int n, p, i, j, k, t, st, dr, mid; ^ user.cpp:9:15: warning: unused variable ‘i’ [-Wunused-variable] int n, p, i, j, k, t, st, dr, mid; ^ user.cpp:9:18: warning: variable ‘j’ set but not used [-Wunused-but-set-variable] int n, p, i, j, k, t, st, dr, mid; ^ user.cpp:6:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fact.in","r",stdin); ^ user.cpp:7:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fact.out","w",stdout); ^ user.cpp:11:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&p); ^