Compilare: user.cpp: In function ‘long long int fc(long long int, long long int)’: user.cpp:8:9: warning: unused variable ‘p’ [-Wunused-variable] int p; ^ user.cpp:24:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:31:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%lld%lld",&n,&p); ^