Compilare: user.cpp: In function ‘int main()’: user.cpp:26:13: warning: unused variable ‘i’ [-Wunused-variable] int n , i , best = 0; ^ user.cpp:26:17: warning: unused variable ‘best’ [-Wunused-variable] int n , i , best = 0; ^~~~ user.cpp:24:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen (in , "r" , stdin); ^ user.cpp:25:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen (out , "w" , stdout); ^ user.cpp:27:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^