Compilare: user.cpp: In function ‘long long int comb(long long int, long long int)’: user.cpp:32:8: warning: unused variable ‘i’ [-Wunused-variable] ll i,r,t; ^ user.cpp: In function ‘int main()’: user.cpp:43:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld%lld",&n,&k); ^ user.cpp:46:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&x); ^