Compilare: main.cpp: In function 'long long int comb(long long int, long long int, long long int)': main.cpp:53:18: warning: unused variable 'fact1' [-Wunused-variable] long long cat, fact1, pi ; ^~~~~ main.cpp: In function 'int main()': main.cpp:67:45: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%lld%lld%lld", &p, &n, &x ) ; ^