Compilare: user.cpp: In function ‘int main()’: user.cpp:31:9: warning: unused variable ‘T’ [-Wunused-variable] int T,n,x,y; ^ user.cpp:29:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("amlei.in","r",stdin); ^ user.cpp:30:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("amlei.out","w",stdout); ^ user.cpp: In member function ‘void P::read(int, int)’: user.cpp:19:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^