Compilare: user.cpp: In function ‘long long int f(long long unsigned int)’: user.cpp:18:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(drop[i]<v[last+i]) ^ user.cpp: In function ‘int main()’: user.cpp:59:20: warning: unused variable ‘c’ [-Wunused-variable] ull x=1, lg=1, c; ^ user.cpp:36:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &l, &n); ^ user.cpp:40:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^