Compilare: user.cpp: In function ‘int main()’: user.cpp:27:49: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "saracsaurege.in" , "r" , stdin ) ; ^ user.cpp:28:51: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "saracsaurege.out" , "w" , stdout ) ; ^ user.cpp:30:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d" , & n , & m ) ; //cin >> n >> m ; ^ user.cpp:31:63: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for ( int i = 1 ; i <= n ; ++ i ) scanf ( "%d" , v + i ) ; //cin >> v [ i ] ; ^ user.cpp:43:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d" , & x , & y ) ; ^