Compilare: main.cpp: In function 'int main()': main.cpp:100:34: warning: unused variable 's' [-Wunused-variable] ll a , b , c , x1 , x2 , n , s; ^ main.cpp:98:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("recurenta2.in" , "r" , stdin); ^ main.cpp:99:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("recurenta2.out" , "w" , stdout); ^ main.cpp:101:70: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld%lld%lld%lld" , &a , &b , &c , &x1 , &x2 , &n); ^