Compilare: user.cpp: In function ‘int main()’: user.cpp:10:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("sdo.in","r",stdin); ^ user.cpp:11:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sdo.out","w",stdout); ^ user.cpp:6:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] #define red(x) scanf("%d",&x); ^ user.cpp:12:1: note: in expansion of macro ‘red’ red(n); ^ user.cpp:6:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] #define red(x) scanf("%d",&x); ^ user.cpp:13:1: note: in expansion of macro ‘red’ red(k); ^ user.cpp:6:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] #define red(x) scanf("%d",&x); ^ user.cpp:15:5: note: in expansion of macro ‘red’ red(v[i]); ^