Compilare: main.cpp: In function 'long long int bs(long long int)': main.cpp:17:31: warning: unused variable 'last' [-Wunused-variable] long long st , dr , med , last , gasit; ^~~~ main.cpp: In function 'int main()': main.cpp:39:19: warning: unused variable 'nr' [-Wunused-variable] long long n , nr; ^~ main.cpp:37:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fact.in" , "r" , stdin); ^ main.cpp:38:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fact.out" , "w" , stdout); ^ main.cpp:40:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld" , &n); ^