Compilare: user.cpp: In function ‘int main()’: user.cpp:27:15: warning: unused variable ‘i’ [-Wunused-variable] long long p,q,i,d,e; ^ user.cpp:25:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gfact.in","r",stdin); ^ user.cpp:26:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gfact.out","w",stdout); ^ user.cpp:29:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&p,&q); ^ user.cpp: In function ‘long long int calc(long long int, long long int)’: user.cpp:19:8: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return last;} ^ user.cpp: In function ‘int main()’: user.cpp:11:25: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] long long st=1,dr=y,mij,last; ^ user.cpp:11:25: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized]